Skip to content
Power·Done Better
Adding a battery to an existing solar system
Add battery to existing solar

Already have solar? Add backup without starting over.

Grid-tied solar shuts off in an outage unless you have a battery. If you already have panels, a battery retrofit may be all you need — see what it would take.

Build my backup plan

What do you want to keep running?

A quick, honest backup profile in about a minute — no contact info needed to see it.

Step 1 of 3

When the grid goes down, what do you want to keep running?

Start with your goal — we'll tailor the rest around it.

No contact info needed to see your estimate. Multiple options. One better decision.

What drives backup time

The honest variables

Usable capacity

The kWh you can actually draw — and how full the battery is when the outage starts.

Your real loads

Fridge and lights sip power; AC, water heaters, and pumps gulp it, with big startup surges.

Recharge strategy

Solar refills the battery by day — but storm clouds cut production when you need it most.

Want the full picture — daily rhythm, storm mode, and the battery-vs-generator comparison? See the complete battery guide →

Free · No pressure

Build a backup plan that fits your home

Tell us what you need to keep running and we'll size an honest option — battery, solar-plus-battery, or another path. If staying as you are makes more sense, we'll tell you.

We compare the numbers. You decide. If solar isn't right for your property, we'll say so.