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API · /offgrid-api

Off-Grid Solar Sizing API

healthy 4,821 Subscribers

Off-grid solar system-sizing maths as an API, computed locally and deterministically — the battery-bank, solar-array and charge-controller numbers an RV, cabin, boat or off-grid homeowner sizes a system with. The battery-bank endpoint gives the storage you need = (daily load × days of autonomy) ÷ (depth of discharge × round-trip efficiency), then ÷ the system voltage for amp-hours: the autonomy carries you through cloudy days and the depth-of-discharge limit protects the cells (lead-acid ~50 %, lithium 80–100 %, which is why lithium banks run smaller), so a 2 kWh/day load at 12 V with 2 days autonomy, 50 % DoD and 85 % efficiency needs about 785 Ah. The array endpoint gives the panels = daily energy ÷ (peak sun hours × system efficiency), where peak sun hours is the day's irradiance as equivalent full-sun hours (~3–6 by place and season) and the efficiency rolls up controller, wiring, heat and dust losses — about 670 W for that load at 4 sun hours and 75 %. The charge-controller endpoint sizes the controller = array watts ÷ battery voltage × a 1.25 safety factor, so a 700 W array on a 12 V bank wants roughly an 80 A controller. Everything is computed locally and deterministically, so it is instant and private. Ideal for solar-installer and DIY tools, RV/marine/cabin power planners, and renewable-energy calculators. Pure local computation — no key, no third-party service, instant. Size for the worst month. 3 compute endpoints. For solar irradiance and sun hours use a solar API; for battery runtime under load a battery API.

#off-grid #solar #battery #renewable-energy #rv #developer-tools
api.oanor.com/offgrid-api
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Machine-readable spec so AI agents can integrate this API.

/api/offgrid-api/openapi.json
/api/offgrid-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
101 ms
Server probes · 24h
Subscribers
4,821
active
Total calls
0
last 7 days
status Full status page → · 4 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 6,600 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 6,600 calls/month
  • 2 req/sec
  • Battery bank + array + controller
  • No credit card
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Starter

€10.90 /month

  • 65,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 65,000 calls/month
  • 6 req/sec
  • Autonomy & depth-of-discharge maths
  • Email support
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Pro

€35.00 /month

  • 256,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 256,000 calls/month
  • 15 req/sec
  • Installer & design pipelines
  • Priority support
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Mega

€108.50 /month

  • 1,320,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,320,000 calls/month
  • 40 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Battery Calculator API

Battery and accumulator maths as an API, computed locally and deterministically from basic electrical relationships. The runtime endpoint estimates how long a battery will last under a given load — from the capacity (in mAh, Ah or Wh) and the load (in watts, or amps at a voltage), with adjustable depth-of-discharge and conversion efficiency — and reports the usable energy and the runtime in hours and minutes. The capacity endpoint converts a battery capacity between milliamp-hours, amp-hours, watt-hours, kilowatt-hours and joules at a given voltage. The pack endpoint builds a series/parallel cell pack (for example 3S2P): it returns the pack voltage, capacity and energy and the total cell count — series adds voltage, parallel adds capacity. The charge endpoint estimates the charge time from the capacity and the charge current (or a C-rate), with a charge efficiency and an optional from/to state-of-charge window. Everything is computed locally and deterministically, so it is instant and private. Real-world figures depend on temperature, age, C-rate and the discharge curve, so treat the results as estimates. Ideal for consumer-electronics and IoT tools, solar and off-grid sizing, drone and RC planning, UPS and backup-power sizing, and EV and battery-pack design. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is battery maths; for Ohm's-law voltage/current/resistance use an electronics API.

api.oanor.com/battery-api

Solar Resource API

Solar irradiance and agroclimatology for any location on Earth — as an API over NASA POWER (Prediction Of Worldwide Energy Resources), derived from NASA satellite and reanalysis data. Get the solar resource needed to size and assess PV and CSP systems: global (GHI), direct-normal (DNI) and diffuse horizontal irradiance, clear-sky irradiance and the clearness index — either as long-term monthly climatology normals for quick site assessment, or as a daily time series for a date range (1981-present). The same call also serves meteorology — temperature, wind speed, relative humidity and precipitation — making it ideal for solar energy, agriculture, building-energy modelling and climate work. From cloudy Berlin to the Sahara, it turns a coordinate into bankable solar and climate data. A solar-resource / agroclimatology data source — distinct from PV-system energy simulation (PVGIS) and historical-weather records. Open data from NASA POWER.

api.oanor.com/solar-api

Solar PV (PVGIS) API

Solar photovoltaic potential for any location on Earth, powered by the EU JRC PVGIS (Photovoltaic Geographical Information System). Estimate how much energy a solar PV system would produce at a given coordinate — yearly and month-by-month output in kWh, the in-plane solar irradiation and a breakdown of system losses (angle-of-incidence, spectral, temperature) — for any panel size, fixed tilt and azimuth; find the optimal panel tilt and orientation that maximises annual output; and read the long-term monthly global horizontal solar irradiation. Covers most of the world (excluding polar and open-ocean areas) from years of satellite-based solar data. Ideal for solar installers and calculators, renewable-energy planning, home-energy and roof-potential tools, and climate / sustainability apps. Open data from EU JRC PVGIS.

api.oanor.com/pvgis-api

Sunrise & Sunset API

Sunrise, sunset, solar noon, day length and the civil, nautical and astronomical twilight phases for any latitude/longitude and date — plus a multi-day range. Useful for agriculture, solar energy, photography, outdoor scheduling, smart-home automation and astronomy apps.

api.oanor.com/sunrise-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Off-Grid Solar Sizing API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Off-Grid Solar Sizing API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Off-Grid Solar Sizing API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Off-Grid Solar Sizing API cost?
Off-Grid Solar Sizing API has a free tier with 100 calls / month. Paid plans start at €10.90 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Off-Grid Solar Sizing API GDPR-compliant?
All requests to Off-Grid Solar Sizing API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/offgrid-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/offgrid-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/offgrid-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/offgrid-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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