Solar Calculator - PV Planner

Plan, size and now TRACK your solar system in one app. Solar Energy Tools gives installers, homeowners and DIY enthusiasts 20+ engineering calculators — and the new Yield Log & ROI Tracker so you can log daily production, see real savings against your grid bill, and know exactly when your system pays for itself.

NEW IN THIS VERSION — YIELD LOG & ROI TRACKER
• Daily solar yield log — record kWh produced each day or week
• Production charts — 30-day and 12-month bar charts of your output
• ROI & payback tracker — enter your grid bill and see monthly savings, "bill without solar" vs actual, and payback in years
• Cumulative savings chart — watch your total savings grow over time
• Tariff editor — flat or slab/tiered rates, net-metering buyback rate, and your currency
• Daily reminder — an optional notification so you never forget to log
• CSV export — share your yield log and grid-bill history

SOLAR CALCULATORS
• Solar production & system sizing
• Battery bank and backup sizing
• Wire/cable size calculator
• Inverter sizing
• Cost & payback estimator
• Carbon footprint offset
• Solar water heating
• Shading loss estimator
• Grid-tie vs off-grid comparison
• EV charging from solar
• Irradiance by location and tilt-angle optimizer

WHY CHOOSE SOLAR ENERGY TOOLS?
• Everything in one place — from planning a system to tracking its returns
• Works offline — your logs and calculations stay on your device
• Clear charts and plain-language results
• Save projects and revisit your history anytime
• Light and dark themes

PERFECT FOR
• Homeowners tracking how much their panels save each month
• Solar installers sizing and quoting systems
• DIY off-grid and RV/van builders
• Students and engineers learning solar design

Whether you are sizing your first array or watching your investment pay off month after month, Solar Energy Tools keeps the numbers — and the returns — in your pocket.

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Recent changes:
• Numbers typed with a comma are now read correctly: 7,5 is seven and a half, and 1,234 or 1,50,000 keep their thousands