Batteries and banks
Lead acid or LiFePO4, single or in series for a 24V or 48V bank.
Diagram software
Draw an electrical diagram without learning CAD
WireElectric is online software for drawing the wiring diagram of a 12V, 24V, 48V or 230V system. You pick real devices from the library, connect their terminals and the app 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.
What this software does differently
Components, not boxes
Drag an inverter/charger, charge controller, fuse holder or busbar onto the canvas with the terminals the device really has. You can only connect points that exist.
Checked while you draw
Per connection the app checks whether positive, negative, line, neutral and earth belong together, whether the branch is fused and whether the conductor size fits the current and length.
No install, no account
The editor runs in the browser. You start drawing right away; an account is only needed to save projects and export a PDF.
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.
What you can draw
The library focuses on DC systems with an AC section:
- Batteries: AGM, gel, lead acid and LiFePO4, in series or parallel
- Inverters and inverter/chargers with a shore power inlet
- MPPT and PWM charge controllers with panels in series or parallel
- DC-DC chargers, split charge relays and alternator chargers
- Fuses (MIDI, MEGA, ANL, blade), breakers and earth leakage protection
- Busbars, shunts, battery monitors, switches and loads on 12V, 24V and 230V
A diagram in four steps
- 1
Pick the system voltage
12V, 24V or 48V for the DC side, with 230V behind it if you use an inverter or shore power.
- 2
Place the source
Battery bank with main fuse and busbars, then the charge sources: solar, alternator or mains charger.
- 3
Connect the loads
Distribution, fuses, switches and loads. Cable length and conductor size are filled in per connection.
- 4
Check and export
Work through the findings, adjust what is needed and save the diagram or print it 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 an electrical diagram without learning CAD
Most diagram tools are built for buildings or electronics: you draw lines and boxes, but the tool has no idea what an MPPT charge controller or a shunt is. A simple 12V diagram then takes hours and nothing gets verified. In WireElectric the components come first. Every device has the terminals it really has — positive, negative, AC in, AC out, PV, earth — and every connection knows which voltage and current it carries.
You can start drawing without an account.
Open WireElectricFrequently asked questions
- Is the software free?
- Drawing and checking starts free without an account. Saving projects and exporting a PDF uses credits you buy per pack; there is no subscription.
- Do I need electrical knowledge?
- Basic knowledge helps, but the findings explain what is missing: a fuse, a conductor that is too thin, or a load on the wrong voltage. You stay responsible, with the manufacturer's instructions taking precedence.
- Can I redraw an existing system?
- Yes. Many people first redraw their current install and use that as the starting point for an upgrade, such as extra panels or a second battery.
- Does it work on a tablet or phone?
- The editor works best on a laptop or desktop with a mouse. On a tablet you can view a diagram; drawing on a phone is not recommended.
Also useful
- Back to the homepage
- Draw the wiring diagram for your camper
- Draw the wiring diagram for your boat
- Draw an off-grid diagram with solar and battery
- Build a 12V wiring diagram that adds up
- Draw the electrical diagram of a caravan
- Solar panel wiring diagram: series or parallel
- Draw a home battery wiring diagram