Contact SolarSizer

Questions, corrections, or feedback — we read everything.

The fastest way to reach us is email:

What to include

Corrections: the page URL and what you believe is wrong — a human reviews every correction and we fix verified errors quickly.
Sizing questions: your daily watt-hours, location or sun hours, and battery voltage. We can point you at the right inputs, though we can’t size your specific system for you.
Feedback: a load, battery type, or feature you wish the calculator handled.
Privacy inquiries: see the privacy policy first, then email us with “Privacy” in the subject.

We’re a small operation, so please allow a few days for a reply.

Understanding Contact SolarSizer

Solar sizing error compounds — wrong panel count means wrong charge controller, wrong wire gauge, wrong inverter. Get contact solarsizer right first.

This tool uses the standard industry formula: it starts from the primary input, applies the safety margin, and rounds up to the next standard size. All intermediate steps are shown on the result card so you can verify the math yourself.

Common mistakes to avoid: reading only the peak rating instead of continuous rating, forgetting headroom for future expansion, or skipping the duty-cycle assumption.

Frequently asked questions

Is this calculator free?

Yes — free to use, no signup, no email required.

How accurate is the estimate?

Estimates follow industry-standard sizing rules and common safety margins. Always confirm with a licensed professional for final sizing.

Can I use this on mobile?

Yes — the page is fully responsive and works on phones, tablets, and desktop.

Where does the math come from?

Formulas are shown inline on the result panel so you can verify each step yourself.