What you are actually buying

A home battery is three things in one box: stored energy (kWh), power output (kW), and the control logic that decides when to charge and discharge. Marketing tends to lea…

Five questions that settle the decision

Sizing: one unit or two?

Use the Home Backup Power Sizing Worksheet (free on this site) to get your daily kWh and peak kW. Then compare to the usable capacity and continuous output of the current…

Where the money goes

Quotes vary widely for the same hardware. Make every installer break the price into these lines so you can compare like for like.

Modes and settings worth understanding

The battery only saves money if it is told what to do.

Questions to ask before signing