Unlock Your Full Potential
Discover how our comprehensive solutions empower your journey.
How much big battery do you need in a campervan?
How do you charge batteries in a campervan?
Whats the difference between DC and AC when converting a Campervan?
Choose the Right Campervan Electrical System
Building an electrical system for a campervan is often the most intimidating part of a van conversion. Not because it is impossible, but because most people have never had to think about electricity this way before. At home, power is always available. In a campervan, you have to create and manage it yourself.
Building an electrical system for a campervan is often the most intimidating part of a van conversion. Not because it is impossible, but because most people have never had to think about electricity this way before. At home, power is always available. In a campervan, you have to create and manage it yourself.
This guide is designed to help you understand how a campervan electrical system works in real life. Not in theory, and not in extreme YouTube builds, but in everyday vanlife scenarios. The goal is to help you make confident decisions before you start buying components.
How much electricity do you need for vanlife?
If you feel unsure about how large your electrical system needs to be, you are not alone. Almost everyone building their first campervan either overestimates or underestimates their needs. This usually happens when you compare your build to someone else’s, instead of starting from your own daily routine.
A good place to begin is by asking yourself three simple questions.
- Do you want to adapt your lifestyle to the electrical system, or should the system adapt to your lifestyle?
- How much time do you spend inside the van each day?
- How many people will use electricity daily?
If you travel solo or as a couple, move around frequently and mainly use electricity for refrigeration, lighting and charging electronics, a smaller system is often more than enough. In those cases, it is usually better to invest in good charging sources and solar panels rather than simply adding more batteries.
If you travel as a family, work remotely or spend long periods inside the van, the electrical system needs to handle a steady and higher load. In those situations, battery capacity alone is rarely the main cost. The system must work as a whole, including batteries, charging, cable sizing and protection.
Our general advice is to size your system so it easily handles a normal day without you having to think about electricity. If you constantly need to plan your power usage, vanlife quickly starts to feel limiting.
Campervan batteries, voltage and capacity
Although lead-acid batteries are cheaper upfront for the same usable capacity, they are significantly heavier and have a much shorter lifespan. For most campervan builds today, we generally recommend lithium batteries.
Even though lithium batteries have a higher purchase price, they almost always result in a cheaper and more reliable electrical system over time.
Lead-acid batteries
- Heavy compared to lithium batteries
- Usable depth of discharge is usually limited to around 50 percent
- Lower upfront cost
- Typical lifespan of 2 to 4 years
Lithium batteries (LiFePO4)
- Much lower weight
- Nearly 100 percent usable capacity
- Higher upfront cost
- Typical lifespan of 10 years or more
Campervan electrical system by number of people
The table below summarises the most common and realistic scenarios we see among campervan builders today. These are not extreme setups. They are systems that work well in everyday use. Use this table as guidance, not as strict rules. There are always exceptions, but for most builds it is surprisingly accurate.
| Number of people | Typical usage | Recommended battery capacity | Voltage | Notes |
|---|---|---|---|---|
| 1 person | Fridge, lighting, fan, laptop, phone | ~200 Ah | 12V | Simple, affordable and easy to build. Ideal for solo vanlife. |
| 2 people | Larger fridge, more charging, longer use | 300–400 Ah | 12V | The most common level for full-time or long trips. |
| 3 people | More time indoors, child, inverter use | ~400 Ah | 12V or 24V | At this point, 24V starts to make sense. |
| 4–5 people | Family vanlife, constant usage | 600 Ah or more | 24V recommended | A robust system is required for comfort and reliability. |
Common mistakes in first campervan electrical systems
After building and living with several campervan electrical systems, we see the same mistakes repeated again and again.
The most common mistake is focusing too much on battery capacity and too little on charging. A large battery bank without enough solar or alternator charging only provides short-term comfort.
Another mistake is building a system that is too complex from the start. A simpler system that you fully understand is always better than a complex one that feels difficult to troubleshoot.
Finally, many people underestimate how much electricity daily life actually consumes when several people share a small space. Ventilation, lighting and refrigeration often run far longer than expected.
How many amp-hours do you need in a campervan?
There is no universal answer, because everything depends on how you use your van.
For an exact answer, we always recommend creating a detailed energy budget where you list your appliances and how long they run each day. That said, most people want a realistic starting point. Below are proven scenarios that work well in practice. All examples assume a 12V system. For 24V systems, simply divide the amp-hour figures by two.
Battery Types, Voltage and Capacity
Although lead-acid batteries are initially cheaper for the same usable capacity, they have a shorter lifespan and are significantly heavier. We generally recommend choosing lithium batteries for your campervan. Despite having a higher initial cost, your electrical system will be cheaper in the long run. When charging, hydrogen and oxygen are produced, which requires good ventilation. Lead-acid batteries are not suitable for fast charging and a full charge often takes 14 to 16 hours. AGM batteries are an exception and can be charged significantly faster than other lead-acid batteries.
Lead-acid batteries
- Life span of 2 – 4 years
- Can generally handle discharges up to 50 percent.
- Lower initial cost
Lithium-ion batteries (LiFePO4) Batteries
- Life span of over 10 years
- Lower weight than lead-acid batteries
- 100% discharge capacity
- Higher initial cost
The Weekend Warrior or Part-Time Vanlife – around 200 Ah
This setup is common for weekend trips, short journeys or summer travel. The system is simple and prioritises reliability rather than home-level comfort.
Electricity is mainly used for basic DC appliances such as refrigeration, lighting and ventilation. An inverter may be installed, but it is used sparingly and not for energy-intensive tasks like cooking or water heating. Air conditioning is not realistic at this level without external power.
Typical consumers include:
- A DC fridge
- LED puck and strip lighting
- One or two roof fans, such as Maxxair
- USB outlets for charging phones and small electronics
A 200 Ah system works very well for part-time vanlife, especially when combined with solar panels and DC-DC charging from the vehicle’s alternator. It is also an excellent entry-level system for first-time builders.
Example battery configurations:
- 1 st 110 Ah AGM battery, 12v – Electronicx
- 1 st 200 Ah LiFePO4 battery,12V – Victron
- 2 st 100 Ah LiFePO4 battery, 12V – ECO-WORTHY
- 1 st 100 Ah LiFePO4 battery, 24V – LiTime
Full-Time Vanlife – around 400 Ah
When a campervan becomes a full-time home, the requirements change. The electrical system needs to handle steady loads without constant monitoring.
Electricity is used not only for basic functions, but also for remote work, longer indoor stays and daily inverter use. Many full-time vanlifers work remotely, meaning laptops, external monitors and charging throughout the day. Fridges are often larger and ventilation runs longer.
A system around 400 Ah provides significantly more freedom. Daily inverter use becomes stress-free, and the system can handle poor weather for short periods without collapsing.
Typical consumers include:
- A larger DC fridge
- Extensive LED lighting
- Multiple charging points for laptops and tablets
- An inverter for 230V appliances
- Fans and comfort equipment running most of the day
At this level, it is also worth considering whether a 24V system makes sense, especially if future expansion is planned.
Example battery configurations:
- 2 st Ah AGM Batterier, 12v – Electronicx
- 1 st 280 Ah LiFePO4 batteri, 12V – ECO-WORTHY
- 2 st 200 Ah LiFePO4 batterier, 12V – Victron
- 2 st 100 Ah LiFePO4 batteri, 24V – LiTime
Luxury Vanlife Without Compromises – 400 Ah or more
If you want your campervan to function close to a grid-connected home, a much larger electrical system is required. At this level, electricity is no longer a limitation, but a given part of daily comfort.
With 400 Ah or more, it becomes possible to cook with induction, run air conditioning for short periods and heat water electrically. This level is common in family builds or year-round travel in varying climates.
However, large battery banks alone do not solve everything. At these capacities, charging becomes critical. Solar, strong DC-DC alternator charging and often shore power must work together for long-term reliability.
Typical consumers include:
- Induction cooking
- Air conditioning or electric heating
- Multiple 230V appliances running simultaneously
- High and constant base consumption from ventilation and refrigeration
These systems are never built by accident. They require planning, experience and a clear understanding of how the van will actually be used.
Example battery configurations:
- 2 st Ah AGM Batterier, 12v – Electronicx
- 1 st 280 Ah LiFePO4 batteri, 12V – ECO-WORTHY
- 2 st 280 Ah LiFePO4 batterier, 12V – ECO-WORTHY
- 4 st 100 Ah LiFePO4 batteri, 12V – LiTime
- 4 st 100 Ah LiFePO4 batteri, 24V – LiTime
Different ways to charge your campervan batteries
Running out of power on the road is every vanlifer’s nightmare. To minimise the risk, we always recommend diversifying your charging sources. For full-time vanlife, all three of the following are strongly recommended.
Solar power
Solar is the backbone of most off-grid campervan systems. A proper energy budget helps determine how much solar you need, but in practice it almost always pays to maximise roof space.
For systems above 300 W, replacing multiple small panels with fewer large panels simplifies wiring and installation. On our campervan Rover, we use two 370 W panels. Larger panels also make it easier to expand later, but they do reduce available roof space, so careful layout planning is essential.
DC-DC charging from the vehicle alternator
DC-DC charging allows you to charge your house batteries while driving. We consider this “free” power, as it lets you plan travel days to recover energy when solar is limited.
One DC-DC charger is usually sufficient for smaller systems up to around 200 Ah. Larger systems or full-time use often benefit from two DC-DC chargers running in parallel.
One DC-DC Charger
- If you are a weekend warrior with a smaller electrical system
- If you have 200 Ah or less lithium batteries to charge
- If your car’s alternator has 160 amps or less
Two DC-DC Chargers
- If you use your van full-time or live a luxurious vanlife
- If you have more than 200 Ah lithium batteries
- If you have two starter batteries
- If you have a powerful alternator or two regular alternators
Shore power via an inverter charger
An inverter charger allows you to charge your batteries from mains power when available. This is especially useful on campsites or when parked at home.
Popular options include:
- Victron MultiPlus Compact 12V 2000W inverter charger
- Victron MultiPlus II 12V 3000W inverter charger
The latter is what we currently use in our latest build.
DC vs AC power in a campervan
There are two ways to use electricity in a campervan: direct current at 12V or 24V, and alternating current at 230V in Europe.
DC power is the heart of an off-grid electrical system. It powers most permanently installed equipment and is far more efficient than converting power to AC first. We believe a campervan should be fully functional using DC alone, so the inverter does not need to run continuously.
AC power adds comfort and flexibility. Anything you plug into a standard socket uses AC. Laptops, kitchen appliances and monitors fall into this category.
Common DC consumers in campervans
- 2x Maxxair Roof fans
- Compressor fridges
- LED lighting
- Water pumps
- USB charging outlets
- Diesel heaters
- Reading LED lights
- Tank heaters
Common AC appliances
- External monitors
- Laptop chargers
- Induction cooktops
- Electric kettles
How to use these guidelines
Use these examples as guidance, not as strict rules. The goal is not to maximise amp-hours, but to build an electrical system that supports the way you want to travel and live. A well-balanced system rarely feels big or small. It simply feels right.