Van Life Solar Calculator 🚐
How to Use the Van Life Solar Calculator
Use the quick-add presets to add typical van appliances to your daily consumption. Or enter your daily Wh directly. Formula: Battery (Ah) = daily Wh × autonomy days / (battery voltage × DoD%). Panel (W) = daily Wh / (sun hours × efficiency).
Most van builds use 12V LiFePO4 batteries with 80% DoD. LiFePO4 saves weight and lasts 3–5× longer than lead-acid. 1 day of autonomy is typical for van life — you can drive to sunny spots when needed.
Van roofs fit 2–4 panels (100–400W each). For a typical van consuming 660 Wh/day at 4.5 peak sun hours: battery ~69 Ah (12V, LiFePO4), panels ~184W. Add 20% margin for safety.
FAQ
How much solar power does a typical camper van need?
A typical van build with a 12V compressor fridge (500 Wh/day), lighting (50 Wh), laptop (60 Wh), and phone charging (20 Wh) consumes about 630–800 Wh/day. This requires approximately 150–200W of solar panels and a 100–150Ah LiFePO4 battery.
What battery is best for a van life solar system?
LiFePO4 (lithium iron phosphate) is the preferred choice for van builds. It offers 80% usable capacity (vs 50% for lead-acid), 3,000–5,000 cycle lifespan, lighter weight (about 1/3 the weight of lead-acid), and no off-gassing — safe for enclosed spaces. The higher upfront cost pays off over 5–10 years.
How many solar panels fit on a van roof?
Most cargo vans (Mercedes Sprinter, Ford Transit, Ram ProMaster) fit 2–4 panels depending on roof size and layout. High-roof Sprinters can typically fit 4 × 100W panels or 2 × 200W panels. A 200–400W array covers most van life energy needs.
Why does the van solar calculator use 1 day of autonomy as default?
Van lifers typically drive frequently, which charges the battery via alternator or DC-DC charger. Unlike a fixed cabin, you can relocate to sunnier spots. 1 day of autonomy is sufficient for most van builds. Increase to 2–3 days if you plan extended stays in cloudy regions.
Do I need a 12V or 24V system for my van?
Most van builds use 12V systems for simplicity — 12V appliances (fridge, lights, fans) connect directly without a converter. 24V is better for high-power loads (>2000W inverter) or long cable runs. For typical van life with a small inverter, 12V with LiFePO4 is the standard choice.