Calculators
Every calculator runs on your own numbers, in your browser. Nothing leaves your device.
Solar and battery payback calculator
Real ROI for 2026: buy without the 25D credit versus lease or PPA with the surviving 48E.
Time-of-use arbitrage calculator
How much a battery saves charging off-peak and discharging at peak under NEM 3.0.
Backup battery sizing calculator
List your loads, get the kWh you need and the products that fit.