Batteries and banks
Lead acid or LiFePO4, single or in series for a 24V or 48V bank.
Boat and yacht
Draw the wiring diagram for your boat
On board two worlds sit side by side: the 12V or 24V system with service and starter battery, and 230V shore power with a land inlet. WireElectric draws both in one diagram 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 a diagram on board
Keep starter and service bank apart
An Argofet or Cyrix separates charging from consuming. The diagram shows whether the starter battery is being drained.
Shore power with earth and RCD
The land inlet, main breaker and residual current device must be present. The check reports a 230V circuit without earth or protection.
Long cables, real voltage drop
Distances from the battery box to the wheelhouse are large. Voltage drop is calculated per connection so you do not have to guess.
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 for a boat installation
The library contains what is common on board, with the terminals of the real device:
- Victron MultiPlus or Quattro with shore power input
- Victron Skylla and Phoenix Smart chargers
- Victron Argofet and Cyrix for separating battery banks
- SmartShunt or BMV-712 for battery monitoring
- Service and starter batteries (AGM, GEL, LiFePO4), busbars and fuses
- 230V shore power: CEE inlet, circuit breaker and residual current device
How to build the diagram
- 1
Place the battery banks
Service and starter battery, each with its own fuse and busbars; at 24V two batteries in series — the app works out the net voltage itself.
- 2
Arrange charging
Alternator with Argofet or Cyrix, an MPPT for solar and a MultiPlus or Skylla charger for shore power.
- 3
On-board net and 230V
Navigation gear, lighting, bilge pump and the 230V part with land inlet, breaker and RCD.
- 4
Review and share
Look at the findings, adjust cables and save or print the diagram for the yard or your insurer.
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 boat
Electrics on a boat are more demanding than at home: moisture, long cable runs, a starter battery that must stay charged and shore power that needs careful earthing. A diagram helps you get separation between banks, protection at the battery and the 230V circuits right up front.
You can start drawing without an account.
Open WireElectricQuestions about boat diagrams
- Can I draw a 24V system?
- Yes. Put two 12V batteries in series or use a 24V battery; the app determines the voltage per net and warns about a 12V load on 24V.
- How do I separate starter and service bank?
- With an Argofet, Cyrix or DC-DC charger. They are in the library with their real inputs and outputs, so the check follows the charging path.
- Does the app check shore power earthing?
- The check looks per connection for an earth connection and protection and reports a missing PE connection.
- Can I hand the diagram to the yard?
- Yes, print it or save it as a PDF. The advice is an aid; manufacturer and installer rules take precedence.
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