{"uid":"cap_Jd1O6n2AsOi_J0c7ZTpwD","slug":"home-energy-calculators-solar-sizing-d2bc10a0","name":"Home Energy Calculators – Solar Sizing","description":"Size a rooftop solar system from annual kWh and peak sun hours: kW, panel count, yearly output, savings and simple payback.","url":"https://home-energy-calc.x402tookit.com/solar-sizing?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["annualKwh","peakSunHours"],"properties":{"annualKwh":{"type":"number","description":"Electricity to offset per year, kWh (100 to 1,000,000)"},"panelWatts":{"type":"number","description":"Watts per panel, 100 to 800 (default 400)"},"costPerWatt":{"type":"number","description":"Installed cost per watt before incentives, for payback"},"pricePerKwh":{"type":"number","description":"Electricity price per kWh, for savings"},"peakSunHours":{"type":"number","description":"Average peak sun hours per day at your site, 1 to 8 (most US sites 3.5 to 6)"},"offsetPercent":{"type":"number","description":"Share of use to cover, 10 to 150 (default 100)"},"incentivePercent":{"type":"number","description":"Tax credit or rebate as % of cost, 0 to 100 (default 0)"},"systemLossPercent":{"type":"number","description":"All system losses, 0 to 50 (default 14, the NREL PVWatts default)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"panelCount":{"type":["null","number"]},"panelWatts":{"type":["null","number"]},"systemKwDc":{"type":["null","number"]},"peakSunHours":{"type":["null","number"]},"systemCostNet":{"type":["null","number"]},"yearlySavings":{"type":["null","number"]},"coveragePercent":{"type":["null","number"]},"systemCostGross":{"type":["null","number"]},"annualKwhToOffset":{"type":["null","number"]},"systemLossPercent":{"type":["null","number"]},"estimatedYearlyKwh":{"type":["null","number"]},"simplePaybackYears":{"type":["null","number"]},"roofAreaSquareFeetApprox":{"type":["null","number"]},"installedKwDcWithWholePanels":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_iexy3SM15tt4owu8UqVHj","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Sizes a rooftop solar system from annual kWh consumption and peak sun hours, returning system kW, panel count, annual output, savings, and simple payback period.","exampleAgentPrompt":"My home uses about 14,400 kWh per year, I get 5.5 peak sun hours per day, electricity costs $0.14 per kWh, installed solar runs $3 per watt, and I qualify for a 30% federal tax credit — how big a system do I need and what's the simple payback?","exampleUseCases":[{"title":"Sizing solar before getting contractor quotes","prompt":"We use about 11,000 kWh a year, our area gets 4.8 peak sun hours a day, and electricity here is $0.16 per kWh. If installed solar costs $3.20 a watt and I get a 26% tax credit, how many panels will I need and how long is the payback?"},{"title":"Evaluating partial solar offset to reduce upfront cost","prompt":"I want to cover only 80% of my 18,000 kWh annual usage with solar. We get 5 peak sun hours daily, my electricity rate is $0.13 per kWh, and I'm budgeting around $2.80 per watt before a 30% incentive — what system size and panel count does that work out to?"},{"title":"Comparing solar economics in a low-sun climate","prompt":"My home in Seattle uses 9,500 kWh a year and we only get about 3.5 peak sun hours on average. Electricity costs $0.12 per kWh and installed solar is $3.50 a watt — can you calculate the system size, number of 400-watt panels, and simple payback with a 30% tax credit?"}],"resultDescription":"Returns a JSON object with system size in kW DC, number of panels, panel wattage, annual energy output, coverage percentage, gross and net system cost, annual savings, and simple payback period in years, along with a summary and disclaimer.","failureModes":["Missing required annualKwh or peakSunHours parameters returns a validation error","Out-of-range values (e.g. peakSunHours > 8 or annualKwh < 100) rejected with error message","offsetPercent outside 10–150 range causes a validation failure","incentivePercent > 100 returns an error","panelWatts outside 100–800 range rejected","Network timeout or service unavailability returns a non-200 HTTP status"],"whenToPreferThis":"Use this endpoint when you need a fast, parameterized solar sizing computation based on known annual consumption and local peak sun hours, especially when you also want financial outputs like payback period and annual savings. Prefer it over general-purpose LLM solar estimates when you want a deterministic, formula-based result with explicit loss factors (NREL PVWatts default) and incentive modeling.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:35:04.156Z","isFirstParty":false,"canonicalSlug":"home-energy-calculators-solar-sizing-d2bc10a0"}