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SiteCheck Trade & Energy – PVWatts Solar Energy Estimator
x402
SiteCheck Trade & Energy – PVWatts Solar Energy Estimator is a paid API for AI agents from api.tradeenergy-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Estimates annual and monthly AC energy output, capacity factor, and solar radiation for a grid-connected PV system at a given latitude/longitude using NREL PVWatts v8 and NSRDB typical-year weather data.
Price / call$0.002
Success—
StatusUnknown
How this service works
NLR (formerly NREL) PVWatts v8 estimate for a grid-connected PV system at a latitude and longitude: annual AC energy (kWh), capacity factor, annual solar radiation, and monthly AC energy. Uses the NSRDB typical-year weather file; this is an estimate, not a yield guarantee.
Output
Returns a JSON object with the queried latitude, longitude, tilt, azimuth, system capacity (kW), annual AC energy (kWh), an array of 12 monthly AC energy values (kWh), capacity factor percentage, annual solar radiation (kWh/m²/day), the NSRDB weather file used, US state and country, the NLR PVWatts API source URL, and the timestamp of the check.
Example use cases
Rooftop solar feasibility check
“I'm thinking about installing a 6 kW solar system on my house in Phoenix — lat 33.45, lon -112.07, panels tilted at 25 degrees facing south. Can you run a PVWatts estimate and tell me the expected annual kWh output and capacity factor?”
Commercial site energy modeling
“We're evaluating a commercial solar installation at lat 37.77, lon -122.42 in San Francisco with a 50 kW system, 15-degree tilt, and 180-degree azimuth. What would the annual and monthly AC energy production look like?”
Solar yield comparison by location
“I want to compare solar energy potential at two sites — first run a PVWatts estimate for lat 35.0, lon -106.65 (Albuquerque) with a 4 kW system at 20-degree tilt, south-facing, and give me the annual kWh and capacity factor.”
Technical details
Endpoint
GEThttps://api.tradeenergy-api.workers.dev/api/energy/pvwatts-solar-simulator?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, authoritative NREL PVWatts v8 solar energy estimate for any US (or global NSRDB-covered) location without standing up your own NREL API key. Ideal for agents performing site feasibility checks, energy audits, or comparing solar yield across candidate sites. Prefer this over generic solar calculators when you need NSRDB typical-year weather accuracy and structured monthly output in a single API call.
Side effects
- Missing required lat or lon parameters returns a validation error
- Latitude or longitude out of valid range (-90 to 90 / -180 to 180) causes an error
- Location outside NSRDB coverage (e.g. ocean or polar regions) may return no weather file
- Capacity below 0.05 kW or above 1000 kW rejected as out-of-range
- Upstream NLR/NREL PVWatts API unavailability results in a gateway or timeout error
- Payment not attached or insufficient USDC causes an x402 payment-required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"lat": 40,
"lon": -105,
"tilt": 40,
"source": "https://developer.nlr.gov/api/pvwatts/v8.json",
"azimuth": 180,
"location": {
"state": "Colorado",
"country": "United States",
"weatherFile": "NSRDB PSM V3 GOES tmy-2020 3.2.0"
},
"checkedAt": "2026-10-23T09:38:22.632Z",
"capacityKw": 4,
"acAnnualKwh": 6700,
"acMonthlyKwh": [
513,
529
],
"capacityFactorPct": 19.12,
"solradAnnualKwhPerM2PerDay": 5.99
}
}Tags
x402
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