Solar batteries & home storage

A battery stores the solar energy you don't use right away so you can tap it later — at night, during peak-price hours, or when the grid goes down.

Why people add a battery

Backup power — keep essentials (or your whole home) running during outages. A standard grid-tied solar system shuts off in a blackout for safety; a battery with the right setup keeps you powered.
Time-of-use savings — if your utility charges more during peak evening hours, you can store cheap/solar energy and use it instead of buying expensive grid power.
Self-consumption — where net metering is weak, storing your surplus is worth more than exporting it.

How it works with solar

During the day, surplus solar charges the battery instead of (or in addition to) going to the grid. In the evening, your home draws from the battery first. Most home batteries today use lithium-ion chemistry (often LFP, lithium iron phosphate, valued for safety and long cycle life).

Sizing: kWh vs. kW

Two numbers matter: capacity (kWh) — how much energy it holds — and power (kW) — how much it can deliver at once. Backing up your whole home needs both high capacity and high power; backing up just essentials (fridge, internet, a few lights) needs much less. Many homeowners start with partial-home backup to keep costs down.

Worth it? If you have frequent outages, time-of-use rates, or weak net metering, a battery can pay off. If your grid is reliable and net metering is strong, the economics are weaker — it becomes more about resilience than savings.