Home battery math, made simple
Honest calculators for home battery and energy decisions — ROI, sizing, backup power, solar and heating. No lead forms, no installers calling you. Just the numbers.
Tools
Every tool answers one real decision you're actually making.
Battery ROI Calculator
Payback period, yearly savings and lifetime ROI for a home battery — with your real rates and incentives.
Open tool →Solar + Battery Savings
Already have solar? See how much extra a battery saves on top of your panels.
Open tool →Battery vs Generator vs Power Station
Which backup-power option actually fits your home, budget and outage profile?
Open tool →Battery Size Calculator
Not sure how many kWh you need? Get a size recommendation from your usage.
Open tool →Heat Pump vs Furnace
Switching heating? Compare annual heating costs of a heat pump vs a gas furnace.
Open tool →Guides
Featured explainers behind the numbers — policy, costs and payback, updated regularly.
Battery Tax Credit 2026
The 30% federal credit ended. What homeowners can still claim — and what to verify before buying.
Read the guide →Solar + Battery vs Solar Alone
What a battery actually adds in 2026 — export rates, self-consumption math and when panels alone win.
Read the guide →Heat Pump Rebates 2026
The federal 25C credit ended. What state and utility programs remain — and how to verify them.
Read the guide →