How Many Solar Panels Do You Need for a Camper Van or RV? (Free Simulator)
If you are asking how many solar panels for a camper van, the honest answer is: it depends on what you plug in. Most vans land between 200W and 800W. Below, you get the simple formula and a live simulator that shows your solar production, your battery level and whether you run out of power overnight.
The sizing formula (step by step)
- Step 1, daily energy: watts of each device × hours used per day = watt-hours (Wh).
- Step 2, solar panels: total Wh ÷ peak sun hours ÷ 0.75 = panel watts.
- Step 3, battery: total Wh × days of autonomy ÷ (12.8V × 0.8) = LiFePO4 Ah at 12V. Example: 1,200 × 2 ÷ 10.24 ≈ 235Ah, so a 200–300Ah bank.
Peak sun hours are roughly 2.5 in winter, 4 in spring and fall, and 5.5 in summer across much of the US and Canada. Check your own area and route.
Typical camper van solar sizes
| Usage | Daily use (approx.) | Solar (at 4 sun hours) |
|---|---|---|
| Weekend trips: lights, phones, small fridge | 300–600 Wh | 100–200W |
| Remote work: laptop, fridge, fan, water pump | 800–1,200 Wh | 300–400W |
| Full-time: plus heater fan, TV, cooking | 1,500–3,000 Wh | 500–1,000W |
Camper van solar simulator
Tick what you use, set the hours, then adjust your panels and battery. The chart shows one day: orange bars are solar production, the dark line is your load, the green line is your battery level.
Orange bars: solar. Dark line: load. Green line: battery level (0–100%). Simplified model, for planning only.
Mistakes to avoid
- Forgetting the fridge: it runs 24 hours a day and is often the biggest load.
- Sizing for summer only, then running out of power in winter.
- Ignoring shade: partial shade can cut a panel's output a lot.
- Buying panels first. Size the battery and the loads first.
Next steps
On a tighter budget? Browse our RV and van solar kits and budget builds. For a bigger system, read what a professional camper van power system includes.
FAQ
How many solar panels do I need for a camper van?
Most camper vans need 200W to 800W. Light weekend use can work with 100W to 200W, while full-time living with a fridge, laptop and heater often needs 500W to 1,000W.
How many watts of solar to run a 12V fridge?
A 12V compressor fridge typically uses about 400 to 700 Wh per day, so around 150W to 250W of solar covers it in spring or fall, before adding other loads.
Can I run an RV air conditioner on solar?
Yes, but it needs a large lithium battery bank and a 2000W to 3000W inverter, and runtime is limited. Plan for it in your sizing, or limit AC to short periods.
Do I need a bigger battery than solar?
Not always. The battery covers nights and cloudy days, while solar refills it. Size both from your daily watt-hours.
