Solar installation for campervans
– Simple steps towards off-grid
Do you dream of hitting the road and going completely off-grid? Or maybe you’re considering living full-time in your campervan and want enough electricity for all the important things, like the coffee machine, perhaps?
Whether you’re planning weekend getaways or full-time vanlife, a campervan solar panel system is the key to powering everything from lights to charging your devices – without ever plugging into mains hook-up.
I’ll never forget my first month on the road in my very first self-converted van. With just one large solar panel on the roof, I realised I had all the power I needed. No energy bills, no paying for hook-ups, just free electricity from the sun. The feeling of freedom was incredible.
Installing a solar system for a campervan is not only a way to become more self-sufficient – it’s also a step towards the freedom to travel without worrying about where your next bit of electricity will come from. By choosing the right components and understanding the difference between monocrystalline and polycrystalline solar panels, series vs parallel wiring, and the importance of an efficient solar charge controller, you can tailor a system to your exact lifestyle.
In this guide, we’ll walk through everything you need to know to install your own campervan solar system – from the core components to installation tips, with practical examples from vanlifers who are already living the dream. Buckle up and let’s dive into everything you need to know to get solar power working in your van.
Small and simple choices can save you hundreds of Euros and make vanlife far more comfortable.
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How Does a Campervan Solar System Work?
SHere’s the short version: when sunlight hits your campervan solar panels, they convert solar energy into electricity, which then charges your leisure batteries. That stored energy powers all the electrical devices in your campervan.
To install a solar system in your van, you need three main components:
- Solar panels
- A solar charge controller
- Leisure batteries
The solar panels collect sunlight and convert it to electricity. They’re connected to a solar charge controller, which safely manages that electricity and passes it to your leisure batteries, where it’s stored. We’ll look at each of these components in detail. For your solar system to work efficiently, all parts need to work together – and each plays an important role.
Ready to get started?
A campervan solar system can seem complicated at first glance, but once you understand the basics it becomes much easier to adapt and install. Want extra help? Check out our other guides on campervan batteries and cable sizing, plus our calculator that helps you choose the correct cable size so you can fine-tune your system to your needs.
Time to harness the power of the sun and start your off-grid journey.
Campervan Solpanel Kit
Allt fler tillverkare paketerar solpaneler i kit som innehåller allt du behöver för att ansluta dem till dina fritidsbatterier. Dessa kit inkluderar lämpligt dimensionerade solcellsregulatorer, kablar och säkringar, vilket eliminerar behovet av att dimensionera dessa komponenter själv.
Både Renogy, Eco Worthyoch Dokio erbjuder färdiga kit som underlättar för dig som är första gångsköpare. Är du istället intresserad bygga ditt eget system från grunden så är Victron, Renogy och Eco Worthybland dem största på marknaden. Samtliga märkena erbjuder mycket pålitliga alternativ.
Renogy erbjuder prisvärda solprodukter designade för budgetmedvetna användare, vilket gör dem till ett utmärkt val för små till medelstora off-grid-system. Victron, även om de är dyrare, är kända för premiumkvalitet, avancerade funktioner och exceptionell hållbarhet, vilket gör dem idealiska för krävande, högpresterande applikationer. Dessvärre erbjuds i skrivandes stund inga kompletta kit med Victron, nedan kommer vi skriva mer om dem mest nödvändiga komponenter.
Solar Panels – Which Type Is Right for Your Van?
When sunlight hits your panels, energy is absorbed and converted into usable electricity. In the Roaming Home 2023 study, we found that most vanlifers install around 300W of solar on their campervans, followed closely by 400W systems. The results varied widely, reflecting the big spread in electrical system sizes and lifestyles.
Monocrystalline Solar Panels
Monocrystalline (or “mono”) panels are made from a single silicon crystal. They’re efficient and look sleek with their deep black appearance.
Advantages of monocrystalline panels:
- Higher efficiency than polycrystalline panels
- Longer lifespan and better performance in high temperatures
Disadvantages:
- More expensive than polycrystalline panels
- Can perform slightly worse in very low light or cold conditions
Personally, I prefer monocrystalline panels – both for their performance and their clean, modern look.
Solar Panels Wired in Series and Parallel
To transfer energy from your panels to your batteries, you need to wire the panels correctly. Here’s the difference:
Series Wiring – Higher Voltage
When solar panels are wired in series, the positive terminal of one panel is connected to the negative terminal of the next.
Pros of series wiring:
- Produces higher voltage at the same current (amps), allowing you to use a smaller (and sometimes cheaper) charge controller
- Lets you use cables with a smaller cross-section because the current is lower
- Generally more efficient over long cable runs
Cons of series wiring:
- If one panel is shaded, the total output of the entire string can drop significantly
Parallel Wiring – Higher Current
When solar panels are wired in parallel, all the positive terminals are connected together and all the negative terminals are connected together.
Pros of parallel wiring:
- Produces higher current (amps) at the same voltage, which is useful when your charge controller or inverter requires a lower input voltage
- If one panel is shaded, only that panel’s output drops — the others continue producing normally
- Allows you to mix panels with slightly different voltages (though matching is still recommended for best performance)
Cons of parallel wiring:
- Can be less efficient over long cable runs due to higher current losses
- Higher current means you’ll need thicker cables to handle the increased amperage
- Often requires a larger (and more expensive) charge controller
Series wiring increases voltage while keeping the current low. It’s efficient for long cable runs and can reduce the cost of wiring and charge controllers, but shading on one panel can reduce the output of the entire string.
Parallel wiring keeps the voltage the same but increases the current. It handles shading better because each panel works independently, but it requires thicker cables and a larger charge controller.
Our Recommendation:
If your panels get consistent sunlight and you want efficient power delivery over longer distances, series wiring is usually the best choice. If partial shading is common or you need to keep the voltage low for your system, parallel wiring will give you more reliable performance.
Combiner Box
Another way to bring solar cables together is with a solar combiner box. This is a small consumer unit designed specifically for solar systems that can both combine and protect panel strings.
Combiner boxes are usually only needed for larger systems with many solar panels. Most campervan conversions can manage perfectly well with a set of MC4 connectors or splitters.
Combiner Box
Another way to bring solar cables together is with a solar combiner box. This is a small consumer unit designed specifically for solar systems that can both combine and protect panel strings.
Combiner boxes are usually only needed for larger systems with many solar panels. Most campervan conversions can manage perfectly well with a set of MC4 connectors or splitters.
Fusing and Protecting Your Solar Panels
To begin with, always check your local electrical rules and regulations. Don’t forget to speak to your insurance company before you start installing electrical systems and solar on your vehicle.
It’s important to add a proper disconnect switch between your solar panels and your charge controller. Specifically, we recommend installing a double-pole DC miniature circuit breaker (MCB). The MCB should have a minimum voltage rating of 250V DC. It can be installed on a DIN rail inside a small consumer unit. A solar-specific MCB like this is easy to buy online.
32A DC double-pole MCB inside a mini consumer unit
We use an MCB instead of simple inline switches for two reasons:
Inline switches are often only rated up to 48V, which can be a problem if your panels are wired in series and your system voltage is higher.
Inline switches usually do not meet the requirement to “disconnect both the positive and negative conductors” as stated in NEC 2020 Article 690.13 section (E).
Ready to Get Started?
A campervan solar system may look complicated at first, but once you understand the basics, it becomes surprisingly easy to customise and install. Need more help? Check out our other guides on campervan batteries, cable sizing, and our wire gauge calculator that helps you choose the correct cable size for your off-grid electrical setup.
It’s time to harness the power of the sun and begin your off-grid adventure!
Campervan Solar Panel Kits
Many manufacturers now offer complete campervan solar panel kits that include everything you need to connect solar panels to your leisure batteries. These kits come with a properly sized solar charge controller, cables, connectors and fuses — saving you the trouble of selecting each component yourself.
Brands like Renogy, Eco Worthy and Dokio offer beginner-friendly kits that are ideal for first-time van builders.
If you prefer designing your own DIY campervan solar setup from scratch, Victron, Renogy and Eco Worthy are among the most trusted names on the market. All of them offer reliable and well-tested off-grid components.
- Renogy provides affordable, budget-friendly solar products that are perfect for small to medium off-grid systems.
- Victron Energy, while more expensive, is known for premium quality, advanced features and outstanding durability — making them an excellent choice for high-performance or full-time vanlife setups.
At the moment, Victron doesn’t offer complete plug-and-play kits, so below we’ll focus on the essential components you’ll need if you choose to build your own system using Victron parts.
Solar Panels – Which Type Is Best for Your Campervan?
When sunlight hits your solar panels, they convert that energy into usable electricity for your van. According to the Roaming Home 2023 study, most campervan owners install around 300W of solar power, followed closely by 400W systems. Results varied widely, reflecting the big differences in electrical needs between van conversions.
Choosing the right panel type depends on your roof space, energy consumption and travel style — whether you’re a weekend camper or living full-time off-grid.
Recommended Complete Campervan Solar Kits
Here are some examples of popular complete campervan solar panel kits:
With the right solar system in your campervan, the limit to your adventures is pretty much endless.
Preparation – Tools and Materials
So, you’ve installed your solar panels on the roof and run your cables – now the fun part begins. Soon your panels will start producing electricity, but before power reaches the batteries we need a key component in place: the solar charge controller.
What Does a Solar Charge Controller Do?
A solar charge controller (or solar regulator) is essential for any campervan solar system. Its job is to regulate the voltage and current from the solar panels so your leisure batteries receive the right amount of energy. Without a controller, your batteries could be overcharged and damaged by high voltage – and no one wants to be stranded with dead batteries.
There are two main types of solar charge controllers, and your choice will affect both performance and budget:
Pulse Width Modulation (PWM)
– The Budget Option
PWM controllers are the simpler and cheaper type. Are they worth it? For basic set-ups, or if you only use your van for weekend trips, a PWM controller can be a perfectly reasonable choice.
A PWM controller works by reducing the panel voltage down to match the battery voltage. The downside is that it’s not as efficient as an MPPT controller, which means you might not get the maximum possible charge from your solar panels – especially on cloudy days or in low-light conditions.
💰 Typical price: Around 300–500 SEK (€25–40) – a good fit for budget systems and shorter trips.
Popular PWM brands:
Victron – Also offers PWM solutions, though they are more known for their MPPT range.
Eco-Worthy – A major international manufacturer and supplier of lithium batteries, solar products and accessories.
Thlevel – A low-cost PWM solar charge controller with strong user reviews.
Populära PWM märken:
- ECO WORTHY –Det är en ledande internationell tillverkare och leverantör av litiumbatterier, solenergi och tillbehör.
- Thlevel – Ett billigt alternativ till solladdningsregulator, PWM, med högt omdöme.
Maximum Power Point Tracking (MPPT)
– The Efficiency King
MPPT controllers are more expensive but operate on a completely different efficiency level. Instead of simply reducing voltage, an MPPT solar charge controller constantly tracks the panel’s maximum power point and converts that energy into the correct voltage and current for your batteries.
An MPPT controller can be up to 25% more efficient than a PWM controller, meaning more energy harvested – even in poor conditions. But watch out for ultra-cheap copies. If the price looks too good to be true, it usually is.
💰 Typical price: From about 1,100 SEK (€95) and upwards. It’s an investment – but absolutely worth it if you want enough power to work, cook and live comfortably across an entire continent.
Popular MPPT brands:
- Victron – Founded in 1975 in the Netherlands, known for reliable off-grid inverters and high-quality solar controllers, especially in the campervan and marine world
- Renogy – Offers excellent 12V and 48V solar solutions designed specifichttps://amzn.to/40c3jt8ally for RVs, campervans and off-grid use
- Eco-Worthy – Established in 2007, a leading international manufacturer and supplier of lithium batteries and solar energy products
Which Solar Charge Controller Is Right for Your Campervan?
- If you’re only heading out occasionally and working with a tight budget, a PWM controller can be a decent choice.
- If you’re a serious adventurer and want to maximise your solar energy – especially on longer trips – an MPPT controller is the obvious winner.
Whichever you choose, a solar charge controller will keep your batteries safe and charged, so you can enjoy your freedom without interruptions. 💡
How Much Solar Do You Need?
Limensioning Solar Panels for a Campervan
Before you choose solar panels, you need to understand your daily power consumption and design a simple campervan electrical diagram.
List All Electrical Devices
Think about what you’ll actually use in your van. Common devices include:
Inverter for 230V (UK/EU) or 240V (UK) mains devices.
- LED lights
- 12V fridge
- Laptops and mobile phones
- Fans
- Water pump
- Kitchen appliances (e.g. induction hob, blender, coffee machine)
Calculate Your Daily Energy Use
Note down each device’s power rating (in watts) and how many hours per day you plan to use it. If power is listed in volts and amps, use the formula:
Watts (W) = Volts (V) × Amps (A)
Then multiply watts by the number of hours per day you use the device to get watt-hours (Wh) per day:
Watt-hours (Wh) = Watts (W) × hours per day
Example:
Phone charger: 4.0W × 2 chargers × 3 hours = 24Wh per day
Do the same for all devices, then add up the total to get your daily energy consumption in Wh.
To convert that into amps at 12V or 24V:
Daily amps (Ah) = Total daily Wh ÷ System voltage (12V / 24V)
Do the same for all devices, then add up the total to get your daily energy consumption in Wh. To convert that into amps at 12V or 24V, around Example:
76Wh ÷ 12V ≈ 6.3Ah per day
Adjust for System Inefficiencies
Most electrical systems have energy losses, especially when using an inverter to convert DC power to AC. If your inverter is around 85–90% efficient, divide your total daily Wh by the efficiency to compensate for conversion losses.
Adjusted consumption = Total daily Wh ÷ Inverter efficiency
Example with a 12V system and 500Wh daily use:
500Wh ÷ 0.9 ≈ 556Wh
Estimate Your Sun Hours
Depending on your location and the season, you can typically expect 3–6 effective sun hours per day – this is roughly the time when the sun is strong enough to charge your panels at a decent rate.
Calculate Required Solar Panel Power
Divide your total daily energy use (Wh) by your expected sun hours to find the minimum solar wattage you need.
Required solar wattage = Total daily Wh ÷ Peak sun hours
Example:
If your daily consumption is 500Wh and you expect 4 sun hours:
500Wh ÷ 4h = 125W of solar
Add a Safety Margin
Because weather is unpredictable, most vanlifers add a 25–50% safety margin. Multiply the calculated wattage by 1.25–1.5.
This is how you move from guesswork to a properly dimensioned campervan solar system.
Example Solar Set-ups and Costs
(Prices are approximate and exclude batteries.)
Budget System
Around €240 – ideal for basic needs like lighting and phone charging:
- 100W solar panel: ~€100
- Inverter:
- Charge controller: ~€50
- Cable kit and mounting hardware:K €30
Mid-Range System
Around €760 – Suitable for longer off-grid trips:
- 3 × 100W solar panels: ~€300
- Pure sine wave inverter: ~€230
- Charge controller: ~€130
- Mounting €100
High-End System
Around €1,875 – for those who want maximum comfort (fridge, coffee machine, laptop charging and more):
- 4 × 130W solar panels: ~€800
- 3,000W inverter: ~€765
- Charge controller: ~2€180
How to Install Solar Panels on a Campervan
Time to mount the panels (often just called “solar” in vanlife slang). Here’s a brief checklist for installing your campervan solar panels:
Safety Check
Do a final check to make sure everything is correctly sized and planned. Consider hiring a qualified electrician to review your system for extra peace of mind.
Order All Components
Make sure all parts are on site so installation can go smoothly. Don’t forget sealant, cable glands and roof penetrations.
Create a Wiring Diagram
Draw a simple schematic that shows how everything connects – from solar panels to charge controller and batteries. This will save you a lot of confusion later.
Mount the Solar Panels
- Clean the roof thoroughly
- Carefully mark drilling points
- Make sure cables can be routed safely through cable glands and that all penetrations are sealed and waterproof
Let the Adhesive Cure
If you’re using adhesive to mount brackets, it’s crucial to let it cure fully. Leave connections untouched for the recommended curing time (often around 24 hours). Avoid heavy rain or extreme temperatures during this time.
Finish the Wiring
Connect the panels together (series or parallel as planned), then to the charge controller and finally to the batteries according to your wiring diagram.
Factors That Affect Campervan Solar Performance
Geographic Location
Solar energy is more abundant in some parts of the world than others. Places closer to the equator get more consistent sunlight throughout the year compared with higher latitudes.
Example: In southern Spain, solar panels can produce up to 40% more energy annually than in northern Germany due to differences in sun hours and intensity.
Season
Output varies significantly with the seasons. In summer, longer days and a higher sun angle increase energy production. In winter, shorter days and a lower sun angle reduce it.
Example: A 300W system in London might generate around 1.2kWh per day in summer but only around 0.3kWh per day in winter.
Weather
Temperature: Solar panels are actually more efficient in cooler temperatures. For each 1°C drop below 25°C, efficiency can improve by around 0.3–0.5%.
Cloud cover: On cloudy days, output can drop by 50–90%, depending on how heavy the cloud is.
Rain: While rain reduces sunlight, it can help wash away dirt and dust, which can slightly improve panel efficiency afterwards.
Solar Panel Tilt and Orientation
Solar panels perform best when they are angled directly towards the sun. The optimal tilt angle changes depending on your latitude and the season. Panels mounted flat on a van roof will typically produce less energy than panels that can be tilted – especially in winter.
If you want to maximise output, use a tilt bracket that lets you adjust the panel angle based on your location. In the northern hemisphere, a tilt angle roughly equal to your latitude is a good all-year compromise.
Maintenance and Operation
Just like your campervan’s engine needs occasional servicing, your solar panels also need a bit of care to keep performing at their best. One of the most important tasks is simply cleaning your panels and removing debris. Dirty panels covered in dust or leaves will produce far less energy than clean, unshaded ones.
Keep your panels as clean as you reasonably can. If you regularly inspect and wipe them down, you’ll not only extend their lifespan, but also allow them to supply more power to your batteries. A small effort can make a big difference – and might mean you can stay off-grid for longer.
How Long Do Campervan Solar Panels Last?
Barring accidents on the road, solar panels generally last 15–30 years. It’s safe to say you won’t be replacing your campervan solar panels very often.
Over time, solar output gradually drops by around 0.5% per year. After about 25 years, they’ll typically produce roughly 12% less than when they were new. Higher-quality panels tend to degrade more slowly and come with longer performance warranties.
Final Thoughts
Whether you’re aiming for a minimal solar set-up or need enough power to run everything from your coffee machine to your laptop, we hope you now have a clearer picture of what your campervan solar system needs to look like. You now know not only which type of solar panel to buy, but also roughly how many panels you’ll need for your campervan build.
Installing and maintaining solar panels on a campervan can feel intimidating, but with the right information and a bit of patience, it’s absolutely manageable. Every step you take towards using solar energy in your campervan not only makes your life easier, it also helps you live more sustainably and responsibly.
Let the sun power your adventures and don’t forget to give your solar panels a little love now and then.