Adding Batteries for Backup Power - A Plain-English Guide
Last verified: September 2026
A battery is what turns solar into real outage backup. Here's what it can keep running, how sizing works, and whether to add one now or make your system battery-ready. No numbers guessed. Questions? Call (330) 200-8042.
Adding a Battery, at a Glance
A home battery is what turns solar from a bill-lowering helper into real outage backup. It stores solar power for the evening or a blackout, and — in a hybrid system — keeps your chosen essential circuits running automatically when the grid goes down, refilling from the sun each day. Batteries are usually sized for essentials, not the whole house, and sizing depends on your must-run list, not a rule of thumb. You can add one now or make the system battery-ready for later. No kWh, prices, or runtimes are guessed here. There's a printable 29-page version up top.
Common Questions
1 Do I need a battery to have backup power?
For practical purposes, yes. Plain grid-tied solar shuts off in an outage for safety. A battery (or a generator) is what keeps your power on — there's no way around that with panels alone.
2 Will a battery run my whole house?
Usually it's set up to run essential circuits — fridge, some lights, internet, a furnace fan, maybe the well pump — not everything at once. A shorter list lets a sensibly sized battery last far longer.
3 How long will a battery last in an outage?
It depends on the battery's size and what you're running — and the sun refills it each day. On essentials with decent sun, it can carry you day after day; running everything drains it fast. Your must-run list is the key.
4 Can I add a battery to solar I already have?
Often yes, though it's simpler and cheaper if the system was designed battery-ready or uses a hybrid inverter. Adding one to an older grid-tied system can take extra equipment — your installer can explain the options.
5 How is a battery sized?
By two numbers — energy (the tank, how long it lasts) and power (the tap, what it can run at once) — matched to your must-run list. A demanding load like a well pump needs enough tap to start it. A proper design gives honest numbers.
6 Should I get the biggest battery I can?
No — size it to your needs. Extra capacity you won't use is wasted money. The goal is a battery matched to your must-run list, which keeps the cost fair and the runtime right where you need it.
Would You Rather I Just Help?
Thinking about a battery so your solar works in an outage? The smartest first step is deciding what must stay on — and that's exactly what I help with. Call me and we'll build your must-run list, then you'll talk sizing with an installer from a position of strength. $99 flat for a visit, 30-day come-back-free.
Would you rather I just do this for you?
No shame in it — plenty of folks would rather hand it off, and that's what I'm here for. I'll come to your home, set it up right, and make sure it's working before I leave. Flat $99 per visit — no jargon, no upsell, and every visit is 30-day come-back-free.
Not a hardware job? I can often fix it remotely for $49 — a secure screen-share, up to 2 hours, that you watch the whole time and can end whenever (included free for $39/mo Support Plan members, and it counts toward the $99 if it turns out I need to come out).