Overlanding trips used to mean rationing your electronics: phone, lights, fridge, and maybe a fan — all running off a secondary battery that slowly drained. Portable solar panels changed that equation. With the right setup, you can camp indefinitely without ever plugging in.
Why Solar for Overlanding?
Modern overlanding rigs are power-hungry. Between a 12V fridge, LED camp lights, phone/laptop charging, a rooftop tent fan, and maybe a portable espresso machine (no judgment), you can easily draw 30-60 amp-hours per day. A 100Ah auxiliary battery lasts 1-2 days at best.
Solar panels replenish your battery during the day, often faster than you're drawing it down. A properly sized solar setup means:
- Unlimited camp time (as long as the sun shines)
- No generator noise (your campsite neighbors will thank you)
- No idling your engine to charge batteries (saves fuel, reduces wear)
- True independence from campground hookups
Types of Overlanding Solar Panels
Portable Folding Panels
The most popular option. Fold out when you're camped, pack away when you drive. Typically 100-200 watts in a briefcase-style case. Set them in the sun, run a cable to your battery, done.
Pros: No permanent installation, aim at the sun for max output, pack away for trail driving
Cons: Must set up/take down each time, can be stolen at camp, take up cargo space
Fixed Roof-Mounted Panels
Permanently mounted to your roof rack or rooftop tent. Always collecting power, even while driving. Semi-flexible panels conform to rack curvature.
Pros: Always on, no setup, can't forget them, charge while driving
Cons: Can't aim at the sun (fixed angle), add weight/drag, shade from rooftop tent can block them, harder to service
Roll-Up / Flexible Panels
Thin-film panels that roll or fold to nearly nothing. Lightweight and packable but lower efficiency than rigid panels. Good as backup or supplement.
Sizing Your System
The basic formula:
- Calculate daily draw: Add up all your devices (amps × hours used). A 12V fridge draws ~4A × 24h = ~40Ah on a hot day. Phone charger ~1A × 3h = 3Ah. LED lights ~2A × 5h = 10Ah. Total: ~53Ah/day.
- Size your panels: A 100W panel produces ~5-6A in peak sun. With 5-6 hours of usable sun, that's 25-36Ah per day. You'd need 200W to comfortably cover 53Ah daily draw.
- Add margin: Clouds, shade, panel angle, and temperature all reduce output. Size 25-50% over your calculated need.
Quick Reference:
- Weekend warrior (phone + lights): 100W portable panel
- Standard overlander (fridge + lights + devices): 200W
- Full camp setup (fridge + fan + laptop + multiple devices): 300-400W
Charge Controllers: PWM vs MPPT
A charge controller sits between your panel and battery, regulating voltage to prevent overcharging:
- PWM: Simple, cheap, ~75% efficient. Fine for small setups (100W or less).
- MPPT: Smart, expensive, ~95% efficient. Converts excess voltage to current. Pays for itself with panels over 100W and in partial shade conditions.
Always use a charge controller — connecting panels directly to a battery risks overcharging and damage.
Battery Pairing
Your solar panels are only as good as your battery storage. Pair them with a quality auxiliary battery:
- AGM: Affordable, proven, handles deep cycling better than flooded. Good budget option.
- Lithium (LiFePO4): Lighter, deeper discharge (80-100% usable vs 50% for AGM), more charge cycles, but 3-4x the cost. The premium choice for serious overlanders.
A battery isolator or DC-DC charger keeps your starting battery separate from your auxiliary — so your fridge doesn't strand you.
Bottom Line
Solar isn't just for eco-warriors — it's practical infrastructure for anyone who camps beyond the campground. A 200W folding panel, an MPPT charge controller, and a quality auxiliary battery gives you genuine off-grid capability for under $1,000.
Browse solar panels and batteries to build your system.