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We typically respond within 24–48 hours on business days.
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Frequently Asked Questions
Is OffGridCalc really free?
Yes, completely free. No registration or subscription fees required.
Does the calculator store my data?
No. All calculations run locally in your browser. We never transmit or store your calculator inputs on our servers.
How accurate are the results?
We use real solar irradiance data from PVGIS (EU Science Hub) and standard sizing algorithms. Results are reliable planning estimates — always consult a qualified solar installer before purchasing equipment.
Can I use OffGridCalc offline?
After the calculator and required location data are loaded, supported calculations can continue offline.