Size a rooftop solar system from annual kWh and peak sun hours
Size a rooftop solar system from annual kWh and peak sun hours: kW, panel count, yearly output, savings and simple payback.
Answers HTTP 429 without x402 payment termsour last check, 2026-10-21
0 of 1checks answered this week
n/amedian answer time
$0.02listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://home-energy-calc.x402tookit.com/solar-sizing
| Category | Everything else |
|---|---|
| Provider host | home-energy-calc.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | no x402 terms | 429 | 332 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"annualKwh": 10000,
"costPerWatt": 3,
"panelWatts": 400,
"peakSunHours": 4.5,
"pricePerKwh": 0.16
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"annualKwh": {
"description": "Electricity to offset per year, kWh (100 to 1,000,000)",
"type": "number"
},
"costPerWatt": {
"description": "Installed cost per watt before incentives, for payback",
"type": "number"
},
"incentivePercent": {
"description": "Tax credit or rebate as % of cost, 0 to 100 (default 0)",
"type": "number"
},
"offsetPercent": {
"description": "Share of use to cover, 10 to 150 (default 100)",
"type": "number"
},
"panelWatts": {
"description": "Watts per panel, 100 to 800 (default 400)",
"type": "number"
},
"peakSunHours": {
"description": "Average peak sun hours per day at your site, 1 to 8 (most US sites 3.5 to 6)",
"type": "number"
},
"pricePerKwh": {
"description": "Electricity price per kWh, for savings",
"type": "number"
},
"systemLossPercent": {
"description": "All system losses, 0 to 50 (default 14, the NREL PVWatts default)",
"type": "number"
}
},
"required": [
"annualKwh",
"peakSunHours"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"annualKwhToOffset": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"coveragePercent": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"estimatedYearlyKwh": {
"type": [
"null",
"number"
]
},
"installedKwDcWithWholePanels": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"panelCount": {
"type": [
"null",
"number"
]
},
"panelWatts": {
"type": [
"null",
"number"
]
},
"peakSunHours": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"roofAreaSquareFeetApprox": {
"type": [
"null",
"number"
]
},
"simplePaybackYears": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"systemCostGross": {
"type": [
"null",
"number"
]
},
"systemCostNet": {
"type": [
"null",
"number"
]
},
"systemKwDc": {
"type": [
"null",
"number"
]
},
"systemLossPercent": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"yearlySavings": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}