Van Wiring Diagram Generator
Safety gear from the diagram
A diagram without fuses and a multimeter is a fire waiting to happen. Here's what you need to wire safely, starting at $9.
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12V Fuse Box
Protects each circuit independently, easy installation.
ANL Fuse 250A + Fuse Holder
Mandatory inverter protection. 250A with integrated fuse holder.
Battery Cable 50mm² Red+Black
50mm² cable for 2000W+ inverter. Red and black, 1m each.
BLUETTI Digital Multimeter
Clamp multimeter for troubleshooting 12V/24V DC circuits — measures voltage, current, resistance. Fits any vanlife toolbox.
Electrical Crimping Tool
Reliable crimp connections on 0.5mm²–16mm² cables, no soldering.
Heat Shrink Tubing Kit
Insulate and protect electrical connections.
FAQ
How to size cables for a van electrical system?+
Wire size depends on current (A), length (m), and acceptable voltage drop (3% max). Formula: S = 2 × ρ × L × I / ΔU. A 2000W/12V inverter needs ~95mm² accounting for efficiency (85%) and temperature derating (+10%).
What fuse for a 2000W inverter at 12V?+
A 2000W inverter draws ~196A DC side (2000W ÷ 12V ÷ 0.85 efficiency). Fuse = 125% × 196A = 250A ANL. Place it as close to the battery positive terminal as possible.
Do I need a battery disconnect switch?+
Yes, a main disconnect switch is essential to cut all power in emergencies. Place it between the battery and the positive bus bar.
What wire size for 300W solar panels?+
For 300W at 12V: Isc ≈ 20.8A, roof-to-MPPT length ~4m. Minimum 6mm² to stay under 3% voltage drop. 30A fuse on the panel side.