Sizing
How Many Solar Panels to Power a Cabin?
The honest answer is "it depends on what you run," but that is not very useful when you are trying to buy panels. So let us turn it into real numbers with three worked examples, from a bare-bones weekend cabin to full-time off-grid living.
The simple formula behind every answer
To find your panel count, you need two things: how much energy you use in a day (watt-hours) and how many good sun-hours your location gets. Then:
Daily watt-hours ÷ sun-hours × 1.25 = total panel watts you need.
Divide that by the size of the panels you want (say 200W each) and you have your panel count. The 1.25 adds about 25 percent margin for losses and imperfect sun. If you want the full method, see how to size an off-grid solar system.
Example 1: the weekend cabin
Lights, phone charging, a small fan, and a couple of nights at a time.
- LED lights: 40W × 5h = 200Wh
- Phone and laptop: 60W × 3h = 180Wh
- Fan and small extras: 120Wh
Daily total: about 500Wh. At 4.5 sun-hours: 500 ÷ 4.5 × 1.25 = about 140W. One 200W panel is plenty, paired with a small 12V battery. This is barely more than a portable power station with a folding panel.
Example 2: the part-time cabin with a fridge
A fridge changes everything, because it runs around the clock.
- Fridge: 1,200Wh per day
- Lights: 100W × 5h = 500Wh
- Laptop, phones, router: 150W × 5h = 750Wh
- Water pump and misc: 550Wh
Daily total: about 3,000Wh. At 4 sun-hours: 3,000 ÷ 4 × 1.25 = about 940W. That is five 200W panels (1,000W). This is the sweet spot for most off-grid cabins and matches our off-grid cabin system build.
Example 3: the full-time off-grid home
Year-round living with more appliances and winter sun to plan around.
- Full-size fridge and freezer: 2,500Wh per day
- Lights, electronics, router: 1,500Wh
- Water pump, washing, kitchen small appliances: 2,000Wh
- Misc household loads: 1,000Wh
Daily total: about 7,000Wh. Using a conservative 3 winter sun-hours: 7,000 ÷ 3 × 1.25 = about 2,900W. That is roughly fifteen 200W panels (3,000W). Full-time homes also lean on a backup generator for the darkest, stormiest weeks so the battery is never run flat.
Quick reference
| Cabin type | Daily use | Panels (200W) | Total watts |
|---|---|---|---|
| Weekend | ~500Wh | 1 | 200W |
| Part-time + fridge | ~3,000Wh | 5 | 1,000W |
| Full-time home | ~7,000Wh | 15 | 3,000W |
Recommended gear
For specific panel picks sized to a cabin, see our roundup of the best solar panels for a cabin. To buy the panels, battery, controller, and inverter as one matched system, our off-grid cabin build lists every part, and the System Builder can tailor it to your exact loads.
The hero part here is the panel itself. A 200W mono panel is the cabin workhorse:
Check 200W Panel Price on Amazon Check Cabin Battery Price on Amazon
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Related guides
Frequently Asked Questions
How many solar panels does a cabin need?
It depends entirely on how much power you use. A weekend cabin with lights and charging may need just 1 to 2 panels (200 to 400W). A part-time cabin with a fridge usually needs 4 to 6 panels (around 1,000W). A full-time off-grid home often needs 8 to 12 panels or more.
Can solar panels alone power a cabin?
Panels collect power, but you also need a battery to store it for nights and a charge controller and inverter to use it. Panels are one part of the system, not the whole thing. In winter, a backup generator is a smart safety net.
Do I need more panels in winter?
Yes. Winter days are shorter and the sun is lower, so the same panels make far less energy, sometimes half. If you live in the cabin year round, size your panels around your worst winter month, not summer.
Are bigger 200W panels better than 100W panels?
For a cabin, larger panels usually mean fewer connections, less roof clutter, and a tidier wiring run for the same total wattage. The main reason to choose smaller panels is a tight or oddly shaped mounting space.