Sizing a Solar Generator — A Plain-English Guide
Last verified: September 2026
Sizing a solar generator is easier than it sounds: you start with what you want to keep running, size the battery to last, and size the panels to refill it — no math to memorize. Here's the plain way to get it right. Want a hand? My number is (330) 200-8042.
Sizing a Solar Generator, at a Glance
Sizing a solar generator starts not with a number but with a list — what you truly want to keep running in an outage. From there you size two things together: the station (its watts decide how much runs at once, its watt-hours decide how long it lasts) and the solar panels (enough to refill it in the sun you actually get). Leave headroom for the start-up surge that motors like a fridge draw, and match the panels to the station's solar input — too much voltage can damage it. Aim at your list plus a sensible cushion rather than the biggest unit on the shelf, and remember the honest limit: a 240-volt well pump or central air is beyond any portable unit. There's a printable version up top.
Common Questions
1 How do I know what size solar generator I need?
Start with a list of what you'd run in an outage, not a number on a box. Add up what runs at once for the watts, and think about how long your outages last for the watt-hours. Your list does the sizing for you.
2 Why size the station for more watts than my things use?
Because motors — a fridge, a fan, a pump — briefly pull several times their running power the instant they start. That surge is short, but the station has to handle it, so you leave headroom above your everyday total.
3 How much solar panel do I need?
Enough to put back roughly what you use in a day, in the sun your spot really gets, without going past the station's input limit. A shady lot or a long outage needs more; a short town outage may need little or none.
4 Can too much panel damage the station?
Yes — feeding the solar input more voltage than it accepts can ruin the unit. Too little panel just means slow refills. Use the maker's own panels or check compatibility before you buy.
5 Is a bigger unit always better?
No. A station far bigger than your list just costs more and weighs more for no benefit. Aim at your must-run list plus a sensible cushion — or pick one that can take an add-on battery later.
6 Can I size one big enough to run my well pump?
No. A 240-volt well pump is beyond any portable unit, however large. That stays a gas generator's job — many rural homes keep both: gas for the pump, solar for the quiet indoor essentials.
Would You Rather I Just Help?
Not sure how big a solar generator you need, or worried about buying too much or too little? That's exactly what I'm here for. I'll help you build your must-run list, size the station and the panels to match, and make sure the panels fit safely — with nothing to sell you. $99 flat for an in-home visit, $49 for remote help, 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).