Complete camper van electrical system designer. Solar + alternator + shore power, per-circuit wire and fuse sizing, wiring schema, and 24-hour battery simulation.
Built for Sprinter, Transit, ProMaster, and any cargo van conversion. Pre-loaded with realistic van life appliances.
Toggle each source you'll have. Combining sources lets you safely reduce battery size.
| Appliance | Watts | Qty | Hrs/day | Wh/day |
|---|
| Appliance | Watts | Peak W | Qty | Hrs/day | Wh/day |
|---|
Hourly battery state-of-charge with current charging sources and loads.
Conceptual diagram showing busbars, charging sources, and circuits with cable/fuse sizing.
Each load needs its own properly-sized fuse and cable. Based on 3% voltage drop @ 4m wire length.
| Circuit | Type | Watts | Amps | Cable | Fuse |
|---|
Most cargo vans have 60–120 sq ft of usable roof. That fits 400–800W of solar depending on panel size and roof fan/AC placement. Flexible panels fit curved roofs but lose ~5% efficiency vs rigid.
Vans have a major advantage over RVs: DC-DC alternator charging. A 30–60 minute drive can push 30–50A into your house battery. Most full-timers combine 200–400W solar + 30A DC-DC and rarely run out.
Nearly all van builds use 12V: short wire runs, plenty of 12V appliances, and a single 100–300Ah LiFePO4 covers most needs. Go 24V only if your bank exceeds 5kWh or you run heavy AC loads.