Why Solar Is Non-Negotiable
Running a van, skoolie, or camper without solar means running your engine to charge batteries, staying near hookups, or constantly worrying about power. A properly sized solar system gives you weeks of independence — run your fridge, laptop, lights, and fans without stressing.
How a Van Solar System Works
Every solar setup has the same four main components. Understanding how they connect is critical before you buy anything.
🧮 Solar Sizing Calculator
Enter your daily power needs and sun hours to get a recommended system size.
Choosing the Right Panels
Monocrystalline vs Polycrystalline
Always go monocrystalline. They're more efficient (20–22% vs 15–17%), perform better in partial shade and high heat, and the price difference is now minimal. For a van roof where space is limited, efficiency matters enormously.
How Many Watts Do You Need?
A comfortable full-time setup typically needs between 400W and 800W of panels. Weekend warriors can get away with 200W. Budget for more than you think — you can always add panels, but you can't add roof space.
| Setup Type | Panels | Battery | Est. Cost |
|---|---|---|---|
| Weekend Warrior | 200W | 100Ah AGM | $400–$700 |
| Part-Timer | 400W | 200Ah Lithium | $1,200–$1,800 |
| Full-Timer | 600W | 300Ah Lithium | $2,500–$3,800 |
| Power User | 800W+ | 400Ah Lithium | $4,000–$6,000 |
| Most full-timers land here → | $2,500–$3,800 | ||
MPPT vs PWM Charge Controllers
Always use an MPPT controller if your panels exceed 200W. MPPT is 25–30% more efficient in real-world conditions — over a year, that's significant free energy. PWM is only appropriate for very small, simple setups.
Wiring: Do It Right or Do It Again
Undersized wiring causes fires. Use a proper wire gauge calculator. As a rule: run your main cables (battery to inverter) in 4/0 AWG or 2/0 AWG. Use an appropriately rated fuse within 18 inches of every battery terminal.
Essential Wiring Rules
- Fuse within 18" of every positive battery terminal
- Use tinned marine-grade wire — it won't corrode
- All connections crimped, not just twisted and taped
- Run 12V DC and 120V AC wires in separate conduits
- Install a battery monitor (Victron BMV-712 is the standard)
Recommended Brands (No Sponsorship)
After testing dozens of setups, these brands show up consistently in reliable builds:
- Panels: Renogy, Rich Solar, Newpowa
- MPPT Controllers: Victron SmartSolar, Renogy Wanderer
- Batteries: Battle Born, Ampere Time, Renogy
- Inverters: Victron, Renogy, AIMS Power
- Monitors: Victron BMV-712, Renogy 500A Shunt