Guide

Home batteries, explained.

What battery backup does, what it costs, and whether it makes sense for your house — from someone who runs one here in Charleston on Dominion Energy.

01 · Start here

Is battery backup worth it?

Two questions decide it — what outages cost you, and whether your utility has a time-of-use rate.

Why a flat rate saves nothing, and the demand charge that can undo a rate switch.

Cost, runtime, noise, and the everyday savings a generator cannot match.

02 · Plan the system

What it backs up, what it costs, and why automatic transfer needs a panel.

kWh vs. kW, the loads that drain a battery, and the startup surge most guides skip.

What stays running when the grid drops, in what order, and the panel that makes transfer automatic.

03 · Choose the hardware

DELTA Pro Ultra or Ultra X, the panel decision, and the real installed cost.

Output, solar, scaling, and the transfer hardware where they differ most.

Most sites still push a dead 30% credit. Here’s what applies now.

See what a battery would do for your home

Run your bill and see what a battery does for your home — backup time, rate-switch savings, and a system sized to your usage.

Free · about 2 minutes · just a recent power bill