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Calculators

You design the layout. We work out the tech.

Put your appliances, taps and furniture in the van. The builder works out what you need and puts it on a shopping list. Wherever possible, the figures come from manuals, standards and manufacturer specs.

PowerCablesWaterInsulationCutting

Energy tab in the builder

Power

Put your fridge, lights, chargers and water heater in the van. The builder adds up what they use per day and checks how long your battery lasts and how quickly it’s full again.

The builder works out

  • Usage per appliance and per day
  • How long you can run on your battery
  • Charging from solar panels, alternator and mains hook-up
  • Whether you need an inverter for 230 V

On your shopping list

  • Leisure battery and chargers, plus an inverter for 230 VFixed
  • Fuses for every circuitCalculated
  • Cables to each appliance, in the right size and lengthCalculated
  • Solar panel, DC-DC charger and mains hook-up if you choose themYour choice
Power drawing: solar and alternator charge the battery, distributor to the fuse box
Example drawing from the power kit, from a different design than the one below.

This is how it looks in the builder · Lounge on a platform, Fiat Ducato L2H2

The builder with the Energy tab open: usage, charging and battery per day, with a label per appliance in 3D
Energy tab: usage and charging per day, the battery and a label in 3D for each appliance.

Part of the power kit

Cables

For each appliance the builder picks the cable size and the fuse. Where the manufacturer specifies something, we follow the manual. Otherwise we calculate the voltage drop to EN 1648-2.

The builder works out

  • Cable size per appliance, for the length of your route
  • Fuse per circuit in the fuse box
  • Main cables and fuses at the battery, per the manuals
  • Routes past the engine bay calculated separately

On your shopping list

  • Cable per size, in metresCalculated
  • Fuses per circuitCalculated
  • Main cables and fuses at the battery, per the manualsFixed

Example from the builder · Lounge on a platform, Fiat Ducato L2H2

ApplianceCableFuse
Starter battery → Orion XS25 mm² · 7.1 m60 A
Solar panels6 mm² · 7.3 m—
Fridge10 mm² · 3.9 m15 A
Water pump2.5 mm² · 1.9 m10 A
USB charger4 mm² · 5.2 m15 A
Lights1.5 mm² · 9.7 m5 A

Source

manual

Standard

EN 1648-2

Longer route

thicker
Example from the builder. The same calculation goes on your shopping list.

This is how it looks in the builder · Lounge on a platform, Fiat Ducato L2H2

The builder with the Cables tab open: every cable as a line through the van, with size and fuse
Cables tab: every cable runs through the van in 3D, with size, fuse and length. 68 m to buy in total.

Water tab in the builder

Water

How many litres you use per day for drinking, washing up and showering, how long your tank lasts and how much hot water the heater gives.

The builder works out

  • Daily use for drinking, washing up and showering
  • How long your tank lasts
  • Hot water from the heater
  • Pipes with T-pieces to every tap

On your shopping list

  • Water tank and pumpFixed
  • Water heaterYour choice
  • Pipes with T-pieces, to every tapCalculated
  • Taps and fittingsYour choice
Water drawing: tank, pump, water heater and tap
Example drawing from the builder.

This is how it looks in the builder · Lounge on a platform, Fiat Ducato L2H2

The builder with the Water tab open: tank, pump and taps per day
Water tab: tank, pump and how many litres you use per tap per day.

Insulation tab in the builder

Insulation

Which material goes on which surface, how many m² you need, how much heat your van loses and whether your heater keeps up. With the manufacturers’ installation guidelines.

The builder works out

  • Material and m² per surface
  • Heat loss of your van
  • Down to which outside temperature your heater keeps you warm
  • Risk of condensation

On your shopping list

  • Insulation per surface, in whole rolls and sheetsCalculated
  • Adhesive, tape and cleanerCalculated
  • Floor: compression-resistant boards, battens and floor panelCalculated
  • Sound-deadening mats and thermal screens for the cabYour choice
Insulation drawing: wall build-up and heat loss
Example at −10 °C with a cab curtain.

This is how it looks in the builder · Lounge on a platform, Fiat Ducato L2H2

The builder with the Insulation tab open: walls, roof, floor, doors and cab coloured by U-value and heat loss
Insulation tab: every surface with its U-value and heat loss, and a package from summer to winter sports.

Cutting list in your shopping list

Cutting

How much timber to buy for your garage, bed and loose wooden parts, and which piece comes from which length.

The builder works out

  • How many full lengths to buy
  • Cutting plan: which piece from which length
  • Cutting list per piece, with size
  • Saw kerf taken into account

On your shopping list

  • Spruce in full lengths of 270 cmCalculated
  • Plywood per sheet of 122 × 244 cmCalculated
  • Cutting list per piece, to tick offCalculated
  • Fittings and having it cut to sizeYour choice
Cutting plan: which piece from which length
Example cutting plan from the builder.

Shopping lists

From calculation to shopping basket

Each module becomes its own list in My account, with the sizes from your design. For each kit you see what you’ve already bought and what’s still to get. Start a list from your design or with an empty kit.

Coming soon: heating, gas and ventilation, each with its own shopping list.

All calculators are included in Monthly

And in the Project Pass. In the free trial you see them locked.

See pricing