230V in the Vehicle

Whether it’s a coffee machine, laptop power supply or induction hob, the right electrical setup lets you use 230 V appliances in your camper van or motorhome. Here you’ll find pure sine wave inverters, combination units, connectors and circuit protection components. The right solution depends on whether you want to run your appliances only on mains hook-up or independently of it as well.

How do you want to use 230 V power in your vehicle?

With mains hook-up, the energy comes from an external power source. Without it, an inverter can convert the DC supply from your leisure battery into 230 V AC. Both options can be combined in a properly designed installation.

Start by considering which appliances you want to use and where: is a socket that works when you’re connected to mains power enough, or should your coffee machine and other appliances also work off-grid? This determines which components you need.

• Plugs & connectors: Choose suitable connections for your 230 V supply.
• Pure sine wave inverters: Power 230 V appliances from your leisure battery.
• 230 V circuit protection: Select protective components and suitable transfer switching for your installation.

Do you actually need an inverter?

If you only use your 230 V appliances at campsites, motorhome stopovers or at home with an external power supply, you do not need an inverter for them. A correctly installed mains hook-up system can supply the designated sockets directly.

Even without mains hook-up, not every device needs an inverter. If you mainly want to charge a smartphone, tablet or USB-C-powered laptop, a high-performance USB charging socket such as our convertiger 100 may be a suitable alternative. It charges compatible devices directly from a 12 V or 24 V electrical system. Its buck-boost technology can increase or decrease the supply voltage, providing the higher USB charging voltages many laptops require even from a 12 V system.

The advantage is that you avoid converting battery power to 230 V and then converting it back again through your device’s power adapter. This can reduce conversion losses and avoids the standby consumption of a switched-on inverter. If you have no other 230 V appliances to power, you can also save the space, weight and cost of an inverter and its associated installation.

Check that your device supports USB-C Power Delivery and that its required charging power and voltage profile are supported by the convertiger. Your USB-C cable must also be rated for the required power. For appliances that genuinely need a 230 V connection, such as a conventional coffee machine or household kettle, you will still need a suitably sized inverter if you want to use them without mains hook-up.

Neither a USB charging socket nor a standalone inverter recharges your leisure battery. You need a suitable charging solution for that. Find out more about charging from an external mains supply in our Mains charging category.

Pure sine wave inverters: 230 V from your leisure battery

An inverter converts battery power into a 230 V AC supply. A pure sine wave model provides a voltage waveform like the one your household appliances receive from the mains. This makes it a sensible choice for running a variety of different appliances.

Choose an input voltage that matches your leisure battery system: a 12 V inverter requires a suitable 12 V system, while a 24 V model requires a 24 V system. The 230 V output specification does not tell you which battery voltage the inverter needs.

A standalone inverter does not charge the battery. If you already have a suitable mains charger and simply want to add power away from a hook-up, it may be exactly the upgrade you need.

Inverter/chargers: when you are planning both functions together

An inverter/charger combination unit brings together an inverter and a battery charger. Without mains hook-up, it powers your 230 V appliances from the battery. When an external supply is connected, it can recharge the battery. Models with an integrated transfer switch also handle switching between the two power sources.

This can be useful for a new conversion if you need both functions anyway. Compare inverter output and charging current separately: a high output for your appliances does not automatically mean equally powerful battery charging. The charging profile and available settings must also suit your battery.

How much inverter power do you need?

List the power consumption of all appliances you intend to run simultaneously. Their combined demand matters, not just the rating of the largest appliance. Also allow for startup surges, for example from compressors, motors and some power supplies.

Compare continuous and peak power separately. A high peak rating is only available briefly and does not mean the inverter can deliver that output for several minutes. Check how long the stated peak power can actually be sustained.

Pay attention to the units in the datasheet: volt-amperes (VA) and watts (W) are not interchangeable for every load. An inverter rated at 2,000 VA therefore does not automatically deliver 2,000 W continuously. Both output limits matter, along with the ratings at the expected ambient temperature.

Power and runtime: Can your battery deliver both?

The inverter must be able to provide the required power. Your battery must both store enough energy and be capable of supplying the necessary current. A large amp-hour capacity alone does not guarantee sufficient current capability.

For example, a 1,500 W appliance running for ten minutes uses 250 Wh of energy. Slightly more is drawn from the battery because of conversion losses. At a battery voltage of 12.8 V, the theoretical current is already around 117 A before those losses. The battery, battery management system, cables and fuses must all be suitable.

Runtime therefore matters when planning your trips. A powerful appliance used briefly can consume less energy than a small device running continuously. Our Autarkie-Designer Pro helps you consider your appliances, time spent parked up and charging opportunities together.

Mains hook-up and inverter power: When do you need a transfer switch?

If the same vehicle sockets are to run from either mains hook-up or the inverter, the installation needs suitable transfer switching. This selects the power source and prevents an unsafe connection between the two supplies. Depending on the device, this function may be integrated or added separately.

A mains priority switch selects the designated preferred source, such as mains hook-up, whenever it is available. Check its current rating and transfer time. Not every transfer switch provides an uninterrupted supply; sensitive equipment may restart during a brief power interruption.

Circuit allocation also needs planning. For example, a separate mains battery charger should not inadvertently be powered by the inverter and attempt to recharge the same battery that is supplying the inverter.

230 V circuit protection: Choose components that suit the system

A miniature circuit breaker (MCB) protects its circuit against overload and short circuits. A residual current device (RCD) provides protection against certain earth leakage faults. An RCBO combines both functions in one device.

The appropriate type depends on the complete installation, including the inverter, transfer switching and intended protection arrangements. Installing an RCD alone does not guarantee effective protection in every operating mode. Mains and inverter operation must be considered together.

Have the fixed 230 V installation and its protective measures designed, installed and tested by a qualified electrician. This also applies when the energy comes from a 12 V or 24 V battery: the inverter’s output carries a hazardous voltage.

Sockets, connections and installation space: What suits your conversion?

Check the voltage rating, current capacity and suitability for the intended location of sockets and connectors. With modular ranges, the socket insert, frame and rear protective enclosure must be compatible. Also allow for the mounting cut-out, installation depth and cable routing space.

The inverter needs adequate cooling and the specified mounting clearances. A warm, enclosed installation space can reduce its available output. If it will be fitted near your bed, also consider cooling fan noise and control options such as a remote switch.

Standby consumption: Does the inverter need to stay on?

A switched-on inverter uses energy even when no appliance is connected. Compare its no-load consumption and available energy-saving modes if it will remain ready for use for long periods. If it has automatic load detection, check whether it reliably detects small appliances too.

For a smartphone, tablet or compatible laptop, a suitable USB-C charging point may be the simpler solution. It avoids the intermediate conversion to 230 V and the separate power adapter. An inverter is most useful for appliances that actually require an AC supply.

What to compare before buying

• Intended use: Do you need 230 V only on mains hook-up, or also when staying off-grid?
• Device type: Is a standalone inverter enough, or do you want integrated battery charging and transfer switching?
• Output: Do the continuous and peak power ratings, under the relevant operating conditions, suit your appliances?
• Battery system: Are the input voltage, available energy and permitted discharge current suitable?
• Installation: Have transfer switching, protective components, cables and sockets been planned as a complete system?
• Everyday use: Do the installation space, cooling, standby consumption and controls suit your vehicle?