Batteries and banks
Lead acid or LiFePO4, single or in series for a 24V or 48V bank.
Camper and van
Draw the wiring diagram for your camper
A camper installation is a 12V system with a 230V part on top: battery, charge controller, solar panels, DC-DC charger, inverter and shore power. WireElectric lets you draw that diagram with real devices and checks every connection.
Drawing and checking is free and works without an account.
- Free drawing, no account
- Victron components with real terminals
- Checks on cables, fuses and voltage
What can you draw?
Every part comes from the component library with real ports, voltages and currents.
Solar panels
Panels in series or parallel to a charge controller at the right voltage.
MPPT charge controller
Charge controllers between solar and battery, including Victron models.
DC-DC charger
Charging from the alternator or starter battery over a DC-DC charger.
Inverter
From 12V or 24V to 230V for your onboard appliances.
Shore power and charger
Mains connection with battery charger, RCD and circuit groups.
12V and 24V loads
Lighting, pump, fridge and other loads with a fuse per circuit.
230V circuits
Sockets and fixed connections behind your inverter or shore power.
Why draw it first
Cable size and voltage drop add up
At 12V voltage drop is the main issue: three metres to a 2000W inverter needs a very different cross-section than three metres to an LED light. Every connection is calculated from current, length and cross-section.
Fuses that protect the cable
Every battery branch needs a main fuse matched to the cable, not just to the load. You immediately see where a MEGA, ANL or MIDI fuse is missing.
12V and 230V properly separated
Shore power, inverter and residual current device belong together. The app determines the voltage per net and warns as soon as a 230V load hangs on the DC side.
Automatic checks while you draw
WireElectric calculates along as you connect parts and reports what does not add up.
Wire size
The required cross-section follows from current, length and allowed voltage drop.
Fuses
A fuse that does not match the cable or the device is flagged.
Voltage drop
Per cable you see the loss in volts and percent.
Connections
Ports that do not match in voltage or type raise a warning.
Components used in a camper
The library contains the devices found in almost every camper, with their real terminals:
- Victron MultiPlus and MultiPlus-II (inverter/charger with shore power)
- Victron SmartSolar MPPT for roof solar panels
- Victron Orion-Tr Smart or Orion XS as DC-DC charger
- Smart LiFePO4 or AGM service battery with shunt
- Positive and negative busbars, MEGA, ANL and MIDI fuses
- 230V panel: circuit breaker, residual current device and CEE shore inlet
From empty canvas to camper diagram
- 1
Start at the battery
Place your service battery (AGM or LiFePO4) with positive and negative busbar and the main fuse in between.
- 2
Add charging sources
SmartSolar MPPT for the panels, an Orion-Tr Smart or DC-DC charger from the starter battery, and a MultiPlus for shore power.
- 3
Loads and 230V
Fridge, water pump, lighting and the 230V part with breaker and RCD behind the inverter output.
- 4
Check and keep
Work through the findings, fill in cable lengths and save or print the diagram as a PDF.
Example wiring diagrams for campervan, boat and off-grid
Calculate it yourself
Every calculator answers one question about your installation. WireElectric then runs the same calculations for every connection in your complete diagram.
Wire gauge calculator
Find the cross-section that suits your 12V or 24V system, based on current, length and voltage drop.
View →Fuse size calculator
Find a suitable fuse for your circuit, including a check on whether the cable can carry it.
View →Voltage drop calculator
Check how much voltage you lose over a cable and what reaches your load.
View →Battery capacity calculator
Work out how much battery capacity in Ah you need for your daily use and autonomy.
View →Battery runtime
Calculate how long a battery can power a load, including the usable share and inverter losses.
View →Watts ↔ Amps
Convert power straight to current at 12V, 24V, 48V or 230V.
View →Solar panel calculator
Work out indicatively how many Wp of solar panels your daily consumption needs.
View →Draw the wiring diagram for your camper
Space is tight in a camper, cable runs are long and the battery is the heart of everything. That is exactly where things go wrong: a 12V cable to the inverter that is too thin, a fuse that does not protect the cable, or a 230V circuit without earth. Drawing first shows those mistakes before you pick up the crimping tool.
You can start drawing without an account.
Open WireElectricQuestions about camper diagrams
- What cable size do I need in my camper?
- It depends on current, length and the allowed voltage drop. Fill in length and expected current per connection; the check tells you whether the cross-section is sufficient.
- Does the battery need a fuse?
- Yes, every branch from the battery must be protected close to the battery by a fuse that protects the cable. If it is missing the check reports an error.
- Can I draw 12V and 230V in one diagram?
- Yes. The app tracks the voltage per net, so shore power, inverter and 230V circuits sit next to your 12V installation in the same drawing.
- Can I use it for an inspection or insurance file?
- You can print the diagram or save it as a PDF. It remains an aid: manufacturer and installer instructions always take precedence.
Also useful
- Back to the homepage
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