400764a9ff
- Add bash script (siter-solar-analysis.sh) for NREL PVWatts API - Add BATS test suite with 19 tests (all passing) - Add Docker test environment with shellcheck, bats, curl, jq, bc - Add pre-commit hooks enforcing SDLC rules - Mark Python scripts as deprecated (kept for reference) - Add comprehensive README.md and AGENTS.md documentation - Add .env.example for configuration template - Add .gitignore excluding private data (base-bill/, .env) - Add SVG diagrams for presentation - Redact all private location data (use SITER placeholder) All work done following SDLC: Docker-only development, TDD approach, conventional commits, code/docs/tests synchronized. Generated with Crush Assisted-by: GLM-5 via Crush <crush@charm.land>
675 lines
21 KiB
Bash
Executable File
675 lines
21 KiB
Bash
Executable File
#!/usr/bin/env bash
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# shellcheck source=/dev/null
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#
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# siter-solar-analysis - NREL PVWatts Solar Production Estimator
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#
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# Usage:
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# ./siter-solar-analysis.sh # Basic analysis
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# ./siter-solar-analysis.sh --scenarios # Compare system sizes
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# ./siter-solar-analysis.sh --help # Show help
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#
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# Environment variables:
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# NREL_API_KEY - Your NREL API key (default: DEMO_KEY)
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# SITER_LAT - Site latitude (default: 30.44)
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# SITER_LON - Site longitude (default: -97.62)
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#
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# Get your free API key at: https://developer.nrel.gov/signup/
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#
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set -euo pipefail
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# Version
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readonly VERSION="1.0.0"
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# Default configuration
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readonly DEFAULT_API_KEY="DEMO_KEY"
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readonly DEFAULT_LAT="30.44"
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readonly DEFAULT_LON="-97.62"
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readonly DEFAULT_PANELS="16"
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readonly DEFAULT_PANEL_WATTS="250"
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readonly DEFAULT_TILT="30"
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readonly DEFAULT_AZIMUTH="180"
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readonly DEFAULT_LOSSES="14"
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readonly DEFAULT_ARRAY_TYPE="0"
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# Financial parameters
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readonly PROJECT_COST="4100"
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readonly CURRENT_MONTHLY_BILL="301.08"
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readonly CURRENT_ANNUAL_CONSUMPTION="23952"
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readonly CONSUMPTION_RATE="0.085"
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readonly EXPORT_RATE="0.04"
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readonly SELF_CONSUMPTION_PCT="0.60"
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# API endpoint
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readonly API_URL="https://developer.nrel.gov/api/pvwatts/v6.json"
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# Colors for output
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readonly RED='\033[0;31m'
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readonly GREEN='\033[0;32m'
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readonly YELLOW='\033[0;33m'
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readonly NC='\033[0m' # No Color
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# Output control
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VERBOSE="${VERBOSE:-false}"
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OUTPUT_FORMAT="${OUTPUT_FORMAT:-text}"
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#######################################
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# Print error message and exit
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# Arguments:
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# $1 - Error message
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# Outputs:
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# Writes error to stderr
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#######################################
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error() {
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echo -e "${RED}ERROR: ${1}${NC}" >&2
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exit 1
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}
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#######################################
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# Print warning message
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# Arguments:
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# $1 - Warning message
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#######################################
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warn() {
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echo -e "${YELLOW}WARN: ${1}${NC}" >&2
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}
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#######################################
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# Print info message
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# Arguments:
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# $1 - Info message
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#######################################
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info() {
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if [[ "$VERBOSE" == "true" ]]; then
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echo -e "${GREEN}INFO: ${1}${NC}" >&2
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fi
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}
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#######################################
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# Print usage information
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#######################################
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usage() {
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cat << EOF
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SITER Solar Analysis - NREL PVWatts Solar Production Estimator v${VERSION}
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USAGE:
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$(basename "$0") [OPTIONS]
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OPTIONS:
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-k, --api-key KEY NREL API key (or set NREL_API_KEY env var)
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--lat VALUE Site latitude (default: ${DEFAULT_LAT})
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--lon VALUE Site longitude (default: ${DEFAULT_LON})
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-p, --panels NUM Number of panels (default: ${DEFAULT_PANELS})
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-w, --watts WATTS Watts per panel (default: ${DEFAULT_PANEL_WATTS})
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-t, --tilt DEGREES Array tilt in degrees (default: ${DEFAULT_TILT})
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-a, --azimuth DEGREES Array azimuth (default: ${DEFAULT_AZIMUTH})
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-l, --losses PERCENT System losses percent (default: ${DEFAULT_LOSSES})
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--scenarios Run multiple system size scenarios
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--json Output as JSON
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--verbose Enable verbose output
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-h, --help Show this help message
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-v, --version Show version
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EXAMPLES:
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# Basic analysis with defaults
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$(basename "$0")
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# With your API key
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$(basename "$0") -k YOUR_API_KEY
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# Compare different system sizes
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$(basename "$0") --scenarios
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# Custom configuration
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$(basename "$0") -p 20 -w 400 --lat 30.5 --lon -97.7
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ENVIRONMENT VARIABLES:
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NREL_API_KEY Your NREL API key
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SITER_LAT Site latitude
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SITER_LON Site longitude
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Get your free API key at: https://developer.nrel.gov/signup/
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EOF
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}
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#######################################
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# Check required dependencies
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# Globals:
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# None
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# Arguments:
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# None
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# Outputs:
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# Error if dependencies missing
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#######################################
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check_dependencies() {
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local missing=()
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command -v curl >/dev/null 2>&1 || missing+=("curl")
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command -v jq >/dev/null 2>&1 || missing+=("jq")
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command -v bc >/dev/null 2>&1 || missing+=("bc")
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if [[ ${#missing[@]} -gt 0 ]]; then
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error "Missing required dependencies: ${missing[*]}\nInstall with: apt-get install ${missing[*]}"
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fi
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}
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#######################################
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# Validate numeric value
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# Arguments:
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# $1 - Value to validate
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# $2 - Parameter name for error message
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# Returns:
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# 0 if valid, 1 if invalid
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#######################################
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validate_numeric() {
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local value="$1"
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local name="$2"
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if ! [[ "$value" =~ ^-?[0-9]+\.?[0-9]*$ ]]; then
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error "Invalid ${name}: '${value}' must be a number"
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fi
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}
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#######################################
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# Validate range
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# Arguments:
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# $1 - Value to validate
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# $2 - Minimum
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# $3 - Maximum
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# $4 - Parameter name
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# Returns:
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# 0 if valid, exits with error if invalid
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#######################################
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validate_range() {
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local value="$1"
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local min="$2"
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local max="$3"
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local name="$4"
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validate_numeric "$value" "$name"
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if (( $(echo "$value < $min" | bc -l) )) || (( $(echo "$value > $max" | bc -l) )); then
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error "Invalid ${name}: ${value} (must be between ${min} and ${max})"
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fi
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}
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#######################################
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# Query NREL PVWatts API
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# Globals:
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# API_URL
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# Arguments:
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# $1 - API key
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# $2 - System capacity (kW)
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# $3 - Latitude
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# $4 - Longitude
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# $5 - Tilt
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# $6 - Azimuth
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# $7 - Losses
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# Outputs:
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# JSON response from API
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#######################################
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query_nrel_api() {
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local api_key="$1"
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local capacity="$2"
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local lat="$3"
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local lon="$4"
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local tilt="$5"
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local azimuth="$6"
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local losses="$7"
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local array_type="${8:-$DEFAULT_ARRAY_TYPE}"
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local url="${API_URL}?api_key=${api_key}&lat=${lat}&lon=${lon}"
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url+="&system_capacity=${capacity}&array_type=${array_type}"
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url+="&tilt=${tilt}&azimuth=${azimuth}&module_type=0"
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url+="&losses=${losses}&timeframe=monthly"
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info "Querying NREL API: capacity=${capacity}kW"
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local response
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local http_code
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# shellcheck disable=SC2086
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response=$(curl -s -w "\n%{http_code}" ${url} 2>/dev/null)
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http_code=$(echo "$response" | tail -n1)
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response=$(echo "$response" | sed '$d')
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if [[ "$http_code" != "200" ]]; then
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error "API request failed with HTTP ${http_code}: ${response}"
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fi
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# Check for API errors
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local api_errors
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api_errors=$(echo "$response" | jq -r '.errors // [] | if length > 0 then .[] else empty end')
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if [[ -n "$api_errors" ]]; then
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error "API returned errors: ${api_errors}"
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fi
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echo "$response"
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}
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#######################################
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# Calculate financial projections
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# Arguments:
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# $1 - Annual production (kWh)
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# Outputs:
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# Financial metrics
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#######################################
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calculate_financials() {
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local annual_kwh="$1"
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local self_consumed
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local exported
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local self_consumption_value
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local export_value
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local total_annual_value
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local monthly_savings
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local offset_pct
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local payback_months
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local payback_years
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self_consumed=$(echo "$annual_kwh * $SELF_CONSUMPTION_PCT" | bc -l)
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exported=$(echo "$annual_kwh * (1 - $SELF_CONSUMPTION_PCT)" | bc -l)
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self_consumption_value=$(echo "$self_consumed * $CONSUMPTION_RATE" | bc -l)
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export_value=$(echo "$exported * $EXPORT_RATE" | bc -l)
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total_annual_value=$(echo "$self_consumption_value + $export_value" | bc -l)
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monthly_savings=$(echo "$total_annual_value / 12" | bc -l)
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offset_pct=$(echo "$monthly_savings / $CURRENT_MONTHLY_BILL * 100" | bc -l)
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if (( $(echo "$monthly_savings > 0" | bc -l) )); then
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payback_months=$(echo "$PROJECT_COST / $monthly_savings" | bc -l)
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else
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payback_months="999999"
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fi
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payback_years=$(echo "$payback_months / 12" | bc -l)
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cat << EOF
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{
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"annual_kwh": $(printf "%.0f" "$annual_kwh"),
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"monthly_avg_kwh": $(printf "%.0f" "$(echo "$annual_kwh / 12" | bc -l)"),
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"self_consumed_kwh": $(printf "%.0f" "$self_consumed"),
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"exported_kwh": $(printf "%.0f" "$exported"),
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"self_consumption_value": $(printf "%.2f" "$self_consumption_value"),
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"export_value": $(printf "%.2f" "$export_value"),
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"total_annual_value": $(printf "%.2f" "$total_annual_value"),
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"monthly_savings": $(printf "%.2f" "$monthly_savings"),
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"offset_pct": $(printf "%.1f" "$offset_pct"),
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"payback_months": $(printf "%.1f" "$payback_months"),
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"payback_years": $(printf "%.1f" "$payback_years")
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}
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EOF
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}
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#######################################
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# Format and display analysis results
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# Arguments:
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# $1 - API response JSON
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# $2 - System capacity (kW)
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# $3 - Panel watts
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# $4 - Number of panels
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# $5 - Latitude
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# $6 - Longitude
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# Outputs:
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# Formatted report
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#######################################
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format_output() {
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local data="$1"
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local capacity="$2"
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local panel_watts="$3"
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local num_panels="$4"
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local lat="$5"
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local lon="$6"
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local annual_kwh
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local capacity_factor
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local solrad_annual
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local station_city
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local station_state
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annual_kwh=$(echo "$data" | jq -r '.outputs.ac_annual')
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capacity_factor=$(echo "$data" | jq -r '.outputs.capacity_factor')
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solrad_annual=$(echo "$data" | jq -r '.outputs.solrad_annual')
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station_city=$(echo "$data" | jq -r '.station_info.city // "N/A"')
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station_state=$(echo "$data" | jq -r '.station_info.state // "Texas"')
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local financials
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financials=$(calculate_financials "$annual_kwh")
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if [[ "$OUTPUT_FORMAT" == "json" ]]; then
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echo "$data" | jq --argjson fin "$financials" \
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--arg capacity "$capacity" \
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--arg panel_watts "$panel_watts" \
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--arg num_panels "$num_panels" \
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'{
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system: {
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capacity_kw: ($capacity | tonumber),
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panels: ($num_panels | tonumber),
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panel_watts: ($panel_watts | tonumber)
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},
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production: {
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annual_kwh: .outputs.ac_annual,
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monthly_kwh: .outputs.ac_monthly,
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capacity_factor: .outputs.capacity_factor,
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solrad_annual: .outputs.solrad_annual
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},
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financials: $fin
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}'
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return
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fi
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# Text output
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echo "======================================================================"
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echo "SITER SOLAR PROJECT - NREL PVWATTS ANALYSIS"
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echo "======================================================================"
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echo ""
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echo "Location: SITER"
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echo " Coordinates: ${lat}, ${lon}"
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echo " Station: ${station_city}, ${station_state}"
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echo ""
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echo "System Configuration:"
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echo " Panels: ${num_panels} × ${panel_watts}W = ${capacity} kW DC"
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echo " Array Type: Fixed Open Rack (Ground Mount)"
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echo " Orientation: ${DEFAULT_TILT}° tilt, ${DEFAULT_AZIMUTH}° azimuth (South-facing)"
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echo " System Losses: ${DEFAULT_LOSSES}%"
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echo ""
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echo "======================================================================"
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echo "MONTHLY PRODUCTION ESTIMATE (NREL PVWatts)"
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echo "======================================================================"
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local months=("Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec")
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local ac_monthly
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ac_monthly=$(echo "$data" | jq -r '.outputs.ac_monthly[]')
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local solrad_monthly
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solrad_monthly=$(echo "$data" | jq -r '.outputs.solrad_monthly[]')
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printf "\n%-6s %-14s %-12s %-15s\n" "Month" "AC Output" "Daily Avg" "Solar Rad"
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printf "%-6s %-14s %-12s %-15s\n" "" "(kWh)" "(kWh/day)" "(kWh/m²/day)"
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echo "--------------------------------------------------"
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local i=0
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local total_kwh=0
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for month in "${months[@]}"; do
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local ac
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ac=$(echo "$ac_monthly" | sed -n "$((i+1))p")
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local solrad
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solrad=$(echo "$solrad_monthly" | sed -n "$((i+1))p")
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local daily_avg
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daily_avg=$(echo "$ac / 30.5" | bc -l)
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printf "%-6s %10.0f %10.0f %14.2f\n" "$month" "$ac" "$daily_avg" "$solrad"
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total_kwh=$(echo "$total_kwh + $ac" | bc -l)
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((i++))
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done
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echo "--------------------------------------------------"
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printf "%-6s %10.0f %10.0f\n" "ANNUAL" "$annual_kwh" "$(echo "$annual_kwh / 12" | bc -l)"
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echo ""
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echo "======================================================================"
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echo "ANNUAL PERFORMANCE SUMMARY"
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echo "======================================================================"
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printf " Annual AC Output: %'.0f kWh\n" "$annual_kwh"
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printf " Monthly Average: %'.0f kWh\n" "$(echo "$annual_kwh / 12" | bc -l)"
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printf " Daily Average: %'.0f kWh\n" "$(echo "$annual_kwh / 365" | bc -l)"
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echo " Capacity Factor: ${capacity_factor}%"
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echo " Avg Solar Radiation: ${solrad_annual} kWh/m²/day"
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echo ""
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echo "======================================================================"
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echo "FINANCIAL ANALYSIS"
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echo "======================================================================"
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local self_consumed_kwh
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local exported_kwh
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local total_annual_value
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local monthly_savings
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local offset_pct
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local payback_years
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self_consumed_kwh=$(echo "$financials" | jq -r '.self_consumed_kwh')
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exported_kwh=$(echo "$financials" | jq -r '.exported_kwh')
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total_annual_value=$(echo "$financials" | jq -r '.total_annual_value')
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monthly_savings=$(echo "$financials" | jq -r '.monthly_savings')
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offset_pct=$(echo "$financials" | jq -r '.offset_pct')
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payback_years=$(echo "$financials" | jq -r '.payback_years')
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echo ""
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echo " Current Consumption: ${CURRENT_ANNUAL_CONSUMPTION} kWh/year"
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printf " Solar Production: %'.0f kWh/year\n" "$annual_kwh"
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printf " Self-Sufficiency: %.1f%%\n" "$(echo "$annual_kwh / $CURRENT_ANNUAL_CONSUMPTION * 100" | bc -l)"
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echo ""
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printf " Self-Consumed (60%%): %'.0f kWh\n" "$self_consumed_kwh"
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printf " Value @ \$%s/kWh: \$%'.2f/year\n" "$CONSUMPTION_RATE" "$(echo "$financials" | jq -r '.self_consumption_value')"
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echo ""
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printf " Exported to Grid (40%%): %'.0f kWh\n" "$exported_kwh"
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printf " Value @ \$%s/kWh: \$%'.2f/year\n" "$EXPORT_RATE" "$(echo "$financials" | jq -r '.export_value')"
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echo ""
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printf " TOTAL ANNUAL VALUE: \$%'.2f\n" "$total_annual_value"
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printf " MONTHLY SAVINGS: \$%'.2f\n" "$monthly_savings"
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echo ""
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echo "======================================================================"
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echo "ROI ANALYSIS"
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echo "======================================================================"
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echo ""
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printf " Project Cost: \$%'.2f\n" "$PROJECT_COST"
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printf " Current Monthly Bill: \$%'.2f\n" "$CURRENT_MONTHLY_BILL"
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printf " Projected Monthly Savings: \$%'.2f\n" "$monthly_savings"
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printf " Bill Offset: %.1f%%\n" "$offset_pct"
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printf "\n PAYBACK PERIOD: %.0f months (%.1f years)\n" "$(echo "$financials" | jq -r '.payback_months')" "$payback_years"
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echo ""
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echo "======================================================================"
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}
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#######################################
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# Run multiple system size scenarios
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# Arguments:
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# $1 - API key
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# $2 - Latitude
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# $3 - Longitude
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# $4 - Number of panels
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# Outputs:
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# Comparison table
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#######################################
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run_scenarios() {
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local api_key="$1"
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local lat="$2"
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local lon="$3"
|
||
local num_panels="$4"
|
||
|
||
local scenarios=(
|
||
"16:250:16 × 250W (older panels)"
|
||
"16:300:16 × 300W"
|
||
"16:350:16 × 350W"
|
||
"16:400:16 × 400W (modern standard)"
|
||
"16:450:16 × 450W (high efficiency)"
|
||
"20:400:20 × 400W (expanded)"
|
||
"24:400:24 × 400W (full offset target)"
|
||
)
|
||
|
||
echo "======================================================================"
|
||
echo "SITER SOLAR - SYSTEM SIZE SCENARIOS"
|
||
echo "======================================================================"
|
||
echo ""
|
||
echo "Location: SITER (${lat}, ${lon})"
|
||
echo "Current Annual Consumption: ${CURRENT_ANNUAL_CONSUMPTION} kWh"
|
||
printf "Current Monthly Bill: \$%'.2f\n" "$CURRENT_MONTHLY_BILL"
|
||
echo ""
|
||
|
||
if [[ "$OUTPUT_FORMAT" == "json" ]]; then
|
||
echo "["
|
||
local first=true
|
||
else
|
||
printf "%-25s %6s %8s %8s %8s %10s\n" "System" "kW" "kWh/yr" "\$/mo" "Offset" "Payback"
|
||
echo "----------------------------------------------------------------------"
|
||
fi
|
||
|
||
for scenario in "${scenarios[@]}"; do
|
||
IFS=':' read -r panels watts desc <<< "$scenario"
|
||
local capacity
|
||
capacity=$(echo "$panels * $watts / 1000" | bc -l)
|
||
|
||
local data
|
||
data=$(query_nrel_api "$api_key" "$capacity" "$lat" "$lon" "$DEFAULT_TILT" "$DEFAULT_AZIMUTH" "$DEFAULT_LOSSES")
|
||
|
||
local annual_kwh
|
||
annual_kwh=$(echo "$data" | jq -r '.outputs.ac_annual')
|
||
|
||
local financials
|
||
financials=$(calculate_financials "$annual_kwh")
|
||
|
||
local monthly_savings
|
||
local offset_pct
|
||
local payback_years
|
||
|
||
monthly_savings=$(echo "$financials" | jq -r '.monthly_savings')
|
||
offset_pct=$(echo "$financials" | jq -r '.offset_pct')
|
||
payback_years=$(echo "$financials" | jq -r '.payback_years')
|
||
|
||
if [[ "$OUTPUT_FORMAT" == "json" ]]; then
|
||
if [[ "$first" != "true" ]]; then
|
||
echo ","
|
||
fi
|
||
first=false
|
||
echo "$financials" | jq --arg desc "$desc" \
|
||
--arg capacity "$capacity" \
|
||
--arg panels "$panels" \
|
||
--arg watts "$watts" \
|
||
'{
|
||
description: $desc,
|
||
panels: ($panels | tonumber),
|
||
watts_per_panel: ($watts | tonumber),
|
||
capacity_kw: ($capacity | tonumber)
|
||
} + .'
|
||
else
|
||
printf "%-25s %6.1f %8,.0f \$%6.2f %6.1f%% %8.1f yrs\n" \
|
||
"$desc" "$capacity" "$annual_kwh" "$monthly_savings" "$offset_pct" "$payback_years"
|
||
fi
|
||
done
|
||
|
||
if [[ "$OUTPUT_FORMAT" == "json" ]]; then
|
||
echo "]"
|
||
else
|
||
echo "----------------------------------------------------------------------"
|
||
echo ""
|
||
echo "Note: To achieve 100% bill offset would require ~32 kW system"
|
||
fi
|
||
}
|
||
|
||
#######################################
|
||
# Main entry point
|
||
# Globals:
|
||
# All configuration variables
|
||
# Arguments:
|
||
# Command line arguments
|
||
# Outputs:
|
||
# Analysis results
|
||
#######################################
|
||
main() {
|
||
local api_key="${NREL_API_KEY:-$DEFAULT_API_KEY}"
|
||
local lat="${SITER_LAT:-$DEFAULT_LAT}"
|
||
local lon="${SITER_LON:-$DEFAULT_LON}"
|
||
local num_panels="$DEFAULT_PANELS"
|
||
local panel_watts="$DEFAULT_PANEL_WATTS"
|
||
local tilt="$DEFAULT_TILT"
|
||
local azimuth="$DEFAULT_AZIMUTH"
|
||
local losses="$DEFAULT_LOSSES"
|
||
local scenarios_mode=false
|
||
|
||
# Parse arguments
|
||
while [[ $# -gt 0 ]]; do
|
||
case "$1" in
|
||
-k|--api-key)
|
||
api_key="$2"
|
||
shift 2
|
||
;;
|
||
--lat)
|
||
lat="$2"
|
||
shift 2
|
||
;;
|
||
--lon)
|
||
lon="$2"
|
||
shift 2
|
||
;;
|
||
-p|--panels)
|
||
num_panels="$2"
|
||
shift 2
|
||
;;
|
||
-w|--watts)
|
||
panel_watts="$2"
|
||
shift 2
|
||
;;
|
||
-t|--tilt)
|
||
tilt="$2"
|
||
shift 2
|
||
;;
|
||
-a|--azimuth)
|
||
azimuth="$2"
|
||
shift 2
|
||
;;
|
||
-l|--losses)
|
||
losses="$2"
|
||
shift 2
|
||
;;
|
||
--scenarios)
|
||
scenarios_mode=true
|
||
shift
|
||
;;
|
||
--json)
|
||
OUTPUT_FORMAT="json"
|
||
shift
|
||
;;
|
||
--verbose)
|
||
VERBOSE="true"
|
||
shift
|
||
;;
|
||
-h|--help)
|
||
usage
|
||
exit 0
|
||
;;
|
||
-v|--version)
|
||
echo "siter-solar-analysis version ${VERSION}"
|
||
exit 0
|
||
;;
|
||
-*)
|
||
error "Unknown option: $1\nTry --help for usage information."
|
||
;;
|
||
*)
|
||
# Positional argument - treat as API key
|
||
api_key="$1"
|
||
shift
|
||
;;
|
||
esac
|
||
done
|
||
|
||
# Check dependencies
|
||
check_dependencies
|
||
|
||
# Validate inputs
|
||
validate_numeric "$lat" "latitude"
|
||
validate_numeric "$lon" "longitude"
|
||
validate_numeric "$num_panels" "panels"
|
||
validate_numeric "$panel_watts" "panel watts"
|
||
validate_range "$lat" "-90" "90" "latitude"
|
||
validate_range "$lon" "-180" "180" "longitude"
|
||
|
||
# Calculate system capacity
|
||
local capacity
|
||
capacity=$(echo "$num_panels * $panel_watts / 1000" | bc -l)
|
||
|
||
if [[ "$scenarios_mode" == "true" ]]; then
|
||
run_scenarios "$api_key" "$lat" "$lon" "$num_panels"
|
||
else
|
||
info "Querying NREL PVWatts API (system: ${capacity} kW)..."
|
||
local data
|
||
data=$(query_nrel_api "$api_key" "$capacity" "$lat" "$lon" "$tilt" "$azimuth" "$losses")
|
||
format_output "$data" "$capacity" "$panel_watts" "$num_panels" "$lat" "$lon"
|
||
fi
|
||
}
|
||
|
||
# Run main if not being sourced
|
||
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
|
||
main "$@"
|
||
fi
|