How Many Solar Panels to Run a House (and a Refrigerator) 2026

“How many solar panels do I need?” has no single answer, because it depends on what you want to run and whether you are going off-grid or just offsetting a power bill. The honest way to size it is to work from the energy you use (watt-hours per day), not from your roof size or a panel count someone quoted you. Here is how the math actually works, with real examples.

The one number that drives everything

Start with daily watt-hours. A standard 400W panel produces roughly 1.3 to 1.8 kWh on a good day, depending on your sun hours (most of the US gets about 4 to 5 peak sun hours), minus system losses. So as a rough rule, one modern panel covers a little over a kilowatt-hour of daily use. Everything below is just dividing your daily use by that figure.

To run a refrigerator

A modern fridge uses about 1 to 2 kWh a day. In daylight, one or two 400W panels cover it easily. The catch is night and outages: the fridge runs around the clock, so you need a battery to bank the day’s surplus and release it after dark. Plan on one to two panels plus battery storage. This is the simplest, most common starter setup, and a portable power station with a folding panel does it with no wiring at all.

To run your essentials

Fridge, lights, Wi-Fi, phone and laptop charging, and a few outlets typically add up to 3 to 6 kWh a day. That is roughly 3 to 5 standard panels and a 2 to 5 kWh battery. This is the “keep life normal through an outage” tier, and it is where most home-backup buyers land.

To run a whole house

An average US home uses about 29 kWh a day, or roughly 10,500 kWh a year, according to the EIA. Covering that off-grid takes roughly 20 to 30 standard 400W panels (about 8 to 12 kW) once you add margin for winter and cloudy days, paired with a 10 to 30 kWh LiFePO4 battery bank. Your own number can be much higher or lower, so pull the daily kWh off a power bill and size to that.

Off-grid vs grid-tied changes the battery, not the panels

If you stay connected to the grid and just want to cut your bill, the grid acts as your battery: you need the panels but little or no storage. If you are truly off-grid, the panel count is similar but you must add a large battery bank and margin for bad weather, and many off-grid homes keep a generator for long cloudy stretches. That battery is the expensive part, see our best LiFePO4 batteries guide.

Size it to your loads, not a rule of thumb

These ranges get you in the ballpark, but the right answer comes from your actual usage and sun hours. Our sizing calculator turns your appliances and daily hours into a panel count and battery size, and our best off-grid solar kits guide covers the complete systems to match.