Solar Calculator Pro

Solar Calculator Pro is a professional solar system sizing tool built for homeowners, off-gridders, RV owners and anyone who wants real numbers before spending money on solar.

Most solar panel calculators give you one oversimplified number. Solar Calculator Pro gives you a complete system plan — sized properly, costed honestly, and exportable as a professional PDF you can take to any installer.

Size your system in under 2 minutes
Enter your daily energy use or build it appliance by appliance using the built-in load builder. The solar system sizing engine calculates your panel count, total array wattage, recommended inverter size, and battery bank in both kWh and Ah — all from your real consumption and local sun hours.

Honest cost estimates — not a made-up number
This is the most honest solar cost estimator on the Play Store. You enter two prices you can actually look up — your panel price per watt and your battery price per kWh. The app estimates inverter, mounting, wiring and installation from real market ranges, then shows you a low-to-high total. Low end is a good DIY install. High end is a fully contracted job. No fake precision.

Know when it pays back
The built-in solar payback calculator tells you exactly when your system breaks even based on your electricity rate, and how much you save every year after that. Backed by the right math, not marketing.

Battery bank calculator built in
Size your battery bank correctly with autonomy days, depth-of-discharge buffering and Ah output at your chosen system voltage — 12V, 24V or 48V.

Save, name and compare plans
Save unlimited plans with custom names. Come back and compare a small cabin off-grid solar setup against a full home rooftop system side by side. Each saved plan shows panel count, battery size, cost range and payback at a glance.

Export a professional PDF
Every saved plan can be exported as a clean, professional PDF report — complete with a full shopping checklist, component specifications, itemised cost breakdown and payback summary. Share it with installers to get accurate quotes, or keep it as your own buying guide.

What Solar Calculator Pro calculates:


→ Panel count and total array size in Wp
→ Recommended inverter size
→ Battery bank in kWh and Ah at your system voltage
→ Full itemised cost breakdown with realistic low-to-high range

→ Break-even payback period and annual savings
→ CO₂ offset per year
→ Professional PDF export with shopping checklist
Built with real engineering formulas. No ads. No subscriptions. No data collected. One purchase, yours forever.