{ "version": "2026-09-30", "title": "SolarCalcNow reproducible planning scenarios: 12 states × 3 self-use shares × 3 export values", "evidenceType": "Synthetic calculations, not measured households, quotes, real utility bills or causal research.", "method": "Run calculateSolarEstimate with the complete input object in each row. State rates and production inputs come from linked snapshots. Production coverage: one full API response, eight rounded API yields and three explicit authored pre-loss assumptions. Costs use the disclosed marketplace-average ±20% author scenario. No API call occurs during generation.", "limitations": "A single author-selected production point is not a statewide average. No hourly matching, actual export tariff, financing, incentives, fixed charges, minimum bills or roof survey. Payback is simple gross-cost payback, not investment return.", "formulas": { "energyTarget": "900 kWh/month × 12 × 100% = 10800 kWh/year", "netACSize": "annual target / (yield × shade multiplier × additional loss factor); factor is 1 for net AC, 0.86 for the three authored pre-loss inputs", "annualSavings": "min(selfConsumedKWh × retail + exportedKWh × exportRate, annualUsageKWh × retail)", "simplePayback": "gross cost / annual energy savings" }, "rows": [ { "input": { "stateSlug": "california", "monthlyUsageKWh": 900, "roofType": "unknown", "shade": "low", "panelWattage": 400, "targetOffset": 1, "selfConsumptionPercent": 30, "exportValueAssumption": "retail-net-metering" }, "state": "California", "exportRetailMultiplier": 1, "rateUSDPerKWh": 0.3361, "referenceYieldKWhPerKWYear": 1595.1758311083977, "productionEvidence": "official", "systemLossesIncluded": true, "systemKW": 6.770413511403122, "panels": 17, "grossCostLowUSD": 13405.418752578182, "grossCostHighUSD": 20175.8322639813, "annualSavingsUSD": 3629.88, "remainingEnergyChargeUSD": 0, "paybackLowYears": 3.6930749095226787, "paybackHighYears": 5.558264257766456, "sourceSnapshots": [ "/data/electricity-rates-2026-09-30.json", "/data/pvwatts-reference-2026-09-04.json", "/data/input-evidence-2026-09-04.json" ] }, { "input": { "stateSlug": "california", "monthlyUsageKWh": 900, "roofType": "unknown", "shade": "low", "panelWattage": 400, "targetOffset": 1, "selfConsumptionPercent": 30, "exportValueAssumption": "partial-export-credit" }, "state": "California", "exportRetailMultiplier": 0.35, "rateUSDPerKWh": 0.3361, "referenceYieldKWhPerKWYear": 1595.1758311083977, "productionEvidence": "official", "systemLossesIncluded": true, "systemKW": 6.770413511403122, "panels": 17, "grossCostLowUSD": 13405.418752578182, "grossCostHighUSD": 20175.8322639813, "annualSavingsUSD": 1978.2846, "remainingEnergyChargeUSD": 1651.5954000000002, "paybackLowYears": 6.7762842376562915, "paybackHighYears": 10.198650014250378, 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"input": { "stateSlug": "california", "monthlyUsageKWh": 900, "roofType": "unknown", "shade": "low", "panelWattage": 400, "targetOffset": 1, "selfConsumptionPercent": 55, "exportValueAssumption": "retail-net-metering" }, "state": "California", "exportRetailMultiplier": 1, "rateUSDPerKWh": 0.3361, "referenceYieldKWhPerKWYear": 1595.1758311083977, "productionEvidence": "official", "systemLossesIncluded": true, "systemKW": 6.770413511403122, "panels": 17, "grossCostLowUSD": 13405.418752578182, "grossCostHighUSD": 20175.8322639813, "annualSavingsUSD": 3629.88, "remainingEnergyChargeUSD": 0, "paybackLowYears": 3.6930749095226787, "paybackHighYears": 5.558264257766456, "sourceSnapshots": [ "/data/electricity-rates-2026-09-30.json", "/data/pvwatts-reference-2026-09-04.json", "/data/input-evidence-2026-09-04.json" ] }, { "input": { "stateSlug": "california", "monthlyUsageKWh": 900, "roofType": "unknown", "shade": "low", "panelWattage": 400, "targetOffset": 1, "selfConsumptionPercent": 55, 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