Solar & Battery Calculators

Enter your system size, cost, and PG&E rate to see your exact payback period, year-by-year savings table, and 20-year ROI. Accounts for NEM 2.0 vs NEM 3.0 and optional battery storage.

See how much a Tesla Powerwall, Enphase IQ Battery, or Franklin aPower saves on your PG&E bill through improved solar self-consumption, TOU peak-shifting, and PSPS outage protection.

Dial in shading, soiling, degradation, and equipment faults to see exactly how much production your system is losing — and how much that costs you each year in dollars.

Two-mode calculator: estimate your annual true-up bill from system details, or find out how much more solar you need to eliminate a high true-up. Calibrated for Central Valley sun hours.

Select the appliances you want to back up and your outage duration goal to get a recommended battery size. Compares Enphase IQ 5P, Tesla Powerwall 3, and Franklin aPower 2.

Enter your annual usage and roof details to find the right system size for your home. Accounts for shading, orientation, and whether you want to offset 80%, 100%, or more of your usage.