Off-Grid Schema

Calculator

Off-Grid Schema

Design Your Off-Grid & Campervan Electrical System Without Costly Mistakes.

Deterministic cable, fuse, battery, and MPPT sizing — before you order parts or trust a guesswork diagram.

Start designingTry cable sizing
VOLTSCHEMA · SLD · DC/ACPV ArrayMPPTLiFePO4BMS · Class-TClass-TSHUNTBUS +BUS −InverterPre-charge ≥2kW230V12/24V DC50–70 mm²≤2% VdropVoc −15°C

Size a cable in seconds

Pick load and run length. Get a DIN/ISO cross-section before you open the full system designer.

Instant cable size

Amps + distance → mm²

Round-trip DC drop capped at 3%. Same physics engine as the full designer.

Recommended conductor

16 mm²

Est. drop 1.85% at 12V · Cu ρ 0.0178

Failure modes we help you avoid

Built from the mistakes that strand vans and cabin systems — not marketing fluff.

  1. 01

    Burned fuses & melted lugs

    Undersized cable or oversize fuse turns a short into heat. We size fuse ≤ ampacity and ≥ 1.25× continuous load.

  2. 02

    Voltage drop → inverter fault codes

    Long battery runs at high amps sag the bus. The designer enforces round-trip drop limits before you buy copper.

  3. 03

    MPPT trips on cold mornings

    String Voc rises in the cold. We apply a cold-weather buffer so the controller’s max input isn’t exceeded.

Build the full system next

Loads, solar, LiFePO4, distances, live wiring preview, and export when you’re ready.

Open the system calculator