How to Install Solar Panels on a Campervan Roof
Installing solar panels on a campervan roof is one of those jobs that sounds simple before you start. You place the panel on the roof, drill a few holes, feed the cables inside and connect everything. Done.
Then you actually stand next to the van with the panel in your hands and start wondering:
Then you actually stand next to the van with the panel in your hands and start wondering:
- Where should it go?
- Will the roof vent shade it?
- Should I drill into the roof?
- How do I stop water getting in?
- Where do the cables enter the van?
- And what happens if something comes loose on the motorway?
Quick answer: how do you install solar panels on a campervan roof?
For most DIY campervans, the safest beginner-friendly setup is a rigid monocrystalline solar panel mounted on brackets or rails, connected to an MPPT charge controller, with properly fused cables running to the leisure battery.
If you are still choosing the panel size, start with our guide to the best solar panel for a campervan before installing anything.
- To install solar panels on a campervan roof, you usually need to:
- Plan the roof layout before drilling anything.
- Choose the right mounting method for your panel and roof.
- Clean and prepare the roof surface.
- Mount the solar panel securely.
- Route the cables through a waterproof cable entry gland.
- Connect the panel to a suitable solar charge controller.
- Connect the controller to the leisure battery with correct fuses and cable sizes.
- Test the system before relying on it.
A quick safety note before you start
Campervan solar is usually a low-voltage system, but that does not mean it should be treated casually. Bad cable routing, missing fuses, poor waterproofing or loose mounting can create real problems. At best, you get leaks or a system that does not charge properly. At worst, you risk damaged equipment, heat build-up, electrical faults or a panel that is not properly secured.
This guide is written for beginners, but it is not a replacement for product manuals or professional electrical advice. Always check the instructions for your specific solar panel, charge controller, battery and mounting products.
Jacob’s simple view is this: a campervan electrical system is a chain. Panel, cable, fuse, charge controller, battery and load. If one part is wrong, the whole system becomes less safe and less useful.
If you are unsure about the electrical side, get help from someone experienced.
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Who this guide is for
This guide is mainly about roof-mounted solar panels. Portable panels are covered briefly, but the focus is on fixed solar panels because they are usually the best everyday solution for most campervans. This guide is for you if:
- You are building your first campervan.
- You want to mount a solar panel on the roof.
- You want to understand the basic installation steps.
- You are not an electrician.
- You want to avoid common beginner mistakes.
- You want a system that works in real vanlife, not only in a YouTube thumbnail.
Before installation: Make sure you have chosen the right solar panel
Before drilling, gluing or ordering mounting parts, make sure you have chosen a panel that actually suits your van.
If you are not sure what size to choose, read our best solar panel for a campervan guide first. It is better to choose the right panel before planning the installation.
| Setup | Best for | Installation note |
| 100W rigid panel | Simple vans and light use | Easy to mount, but limited output |
| 200W–240W rigid panel | Most first campervan builds | Best balance for many beginners |
| 300W–400W rigid setup | More off-grid use or laptop work | Needs more roof space and planning |
| Flexible panel | Curved roofs or low-profile builds | Needs careful surface prep and heat consideration |
| Portable panel | Parking in shade or no-drill setups | Usually better as an add-on |
Step 1: Plan your campervan roof layout
Do not start by drilling holes in your campervan, insetad start with the roof.
Roof space disappears faster than you expect. A roof vent, skylight, roof rack, antenna, awning bracket or storage box can all affect where your solar panel should go.
Place the panel on the roof before fixing anything. Move it around. Look at it from different angles. Open the roof vent if you have one. Think about where shadows will fall.
Small shadows can reduce solar output more than beginners expect. A panel that looks perfectly placed in the morning might be partly shaded by a roof vent later in the day.
Amanda’s practical note here: do not only plan for the panel. Plan for the van you might have after a year of travelling. Roof boxes, vents and “small upgrades” have a habit of appearing later.
Before deciding the final position, check:
- Will the panel fit without touching the roof vent?
- Can the roof vent still open fully?
- Will roof bars or storage boxes shade the panel?
- Can you clean around the panel later?
- Can you route the cables neatly?
- Is there space for a future second panel?
- Will the panel sit flat and secure?
- Can you reach the mounting points safely?
Step 2: Decide how you will mount the solar panel
There are several ways to mount a solar panel on a campervan roof. The right method depends on your panel type, roof shape and how permanent you want the installation to be.
For many beginner builds, a rigid panel mounted on brackets or roof bars is a sensible choice. It gives the panel some airflow underneath and makes the installation easier to inspect later.
Flexible panels can be useful, but they need careful installation. If they are bonded directly to the roof, heat can become more of an issue, and removing them later can be annoying.
The common options for solar panels are:
| Mounting method | Best for | Main caution |
| Corner brackets | Simple rigid panel installs | Needs strong bonding or fixing |
| Side brackets | Larger rigid panels | Must support panel properly |
| Roof bars or rails | Stronger and more flexible setups | Adds height and cost |
| Adhesive mounting | No-drill or low-drill installs | Surface prep is critical |
| Bolted mounting | Very secure when done properly | More holes and waterproofing work |
| Flexible panel bonding | Low-profile or curved roofs | Heat and removal can be issues |
Step 3: Gather the tools and parts before you start
You think you have everything. Then you realise you are missing a connector, the cable gland, the correct fuse holder or the right size cable. Suddenly the “small afternoon job” becomes two weekends and three extra orders.
We learned this the annoying way with campervan electrics. It is not only the panel or battery that costs money. The small parts add up quickly.
If we were building on a budget today, we would not try to save money by skipping fuses, cable protection or proper waterproofing. Those are not luxury items. They are the parts that help the system survive real travel.
- Solar panel
- Mounting brackets
- Roof bars or rails
- Entry gland
- Solar cable
- MC4 connectors, if needed
- Solar charge controller
- Battery cable and wires
- Correct fuses or breakers
- Cable ties or cable clips
- Suitable adhesive/sealant if bonding
- Roof cleaner/degreaser
- Drill and drill bits, if drilling
- Screwdriver or socket set
- Multimeter
- Marker pen and measuring tape
- Personal safety gear
- Product manuals
- Heat shrink or protective sleeving
Step 4: Clean and prepare the roof
Whether you are drilling, bonding or using roof bars, the roof needs to be clean. Dirt, wax, old sealant, polish and road grime can all reduce how well adhesives or sealants work. Even if you are using mechanical fixings, a clean roof makes it easier to mark, seal and inspect the installation. This is a boring step. It is also one of the most important.
A solar panel installation is not only about electricity. It is also about keeping water outside the van. And water is very good at finding small mistakes.
A basic preparation process usually looks like this:
- Do not rush curing time.
- Wash the roof properly.
- Dry the area.
- Mark the panel position.
- Clean the bonding or sealing areas with a suitable cleaner.
- Follow the adhesive or sealant manufacturer’s instructions.
Step 5: Mount the solar panel
Now it is time to fix the panel to the roof. The exact process depends on your mounting system, so always follow the instructions for your brackets, rails, adhesive and panel. But the general idea is the same: the panel must be secure, supported and positioned so it will not move while driving.
For a rigid panel, you will usually:
- Attach brackets to the panel frame.
- Place the panel in its final roof position.
- Mark mounting points.
- Prepare the roof surface.
- Bond, screw or bolt the brackets depending on your method.
- Seal any holes carefully.
- Let adhesive or sealant cure properly before driving.
- Check that the panel cannot move.
Do not rely on “it feels solid” only. Think about wind, vibration, emergency braking and years of driving. CamperPals rule of thumb: If it can vibrate loose, assume it eventually will.
That does not mean you need to overbuild everything like a bridge. It means the panel should be mounted with real road use in mind.
Step 6: Route the solar cables into the van
Most fixed solar panels need cables to enter the van through the roof. The usual solution is a waterproof cable entry gland. This is a small roof-mounted box or fitting that lets the cables pass through while helping keep water out.
Before drilling a cable hole, check both sides of the roof. From above, the position may look perfect. From inside, it might land behind a beam, inside a cabinet you cannot access, or in the wrong part of the ceiling.
Do not leave cables rubbing against sharp metal. A campervan moves, and cable insulation can wear over time.
Before making the hole, ask:
- Where will the cable enter inside the van?
- Can I reach it later?
- Is it close to the charge controller?
- Will it interfere with insulation, cladding or cabinets?
- Can I route the cable safely?
- Is the hole away from roof ribs or structural parts?
Once the cable entry point is chosen, the basic process is usually:
- Mark the cable entry location.
- Check inside and outside before drilling.
- Drill the hole carefully.
- Protect sharp metal edges.
- Feed the cable through.
- Fit and seal the cable entry gland.
- Route the cable neatly inside the van.
Step 7: Install the solar charge controller
The solar charge controller sits between the solar panel and the leisure battery.
Its job is to control the charging so the battery is charged properly.
For most campervans, we recommend an MPPT charge controller if the budget allows it. PWM controllers can work in smaller budget systems, but MPPT is usually the better choice for getting more useful charging, especially in mixed weather.
Step 8: Connect the system in the correct order
The correct connection order can depend on the charge controller, so always check the manual for your specific controller. In many systems, the general principle is:
- Connect the charge controller to the battery first.
- Then connect the solar panel to the charge controller.
- Check that the controller recognises the battery and begins charging correctly.
The reason is simple: many controllers need to detect the battery voltage before receiving power from the solar panel. Do not guess here, take your time and read the manual.
Also, do not connect or disconnect MC4 solar connectors under load unless the manufacturer says it is safe to do so. Solar panels can produce voltage whenever they are exposed to light. A practical trick is to cover the panel or work when light levels are low, but still follow the product instructions.
Step 9: Add fuses and protect the cables
Fuses are there to protect the cable and system if something goes wrong. Where fuses are needed depends on the system design, cable lengths and components, but many campervan solar setups need fuse protection between the charge controller and battery. Larger or more complex systems may need additional protection.
This is one of the parts where we do not recommend copying a random diagram from the internet without understanding it. Jacob’s technical note: the fuse should protect the cable, not just the device. A large fuse on a small cable is not a safety upgrade. It is a problem wearing a plastic cover.
At minimum, check:
- Fuse size guidance from component manufacturers
- Charge controller manual
- Solar panel specifications
- Battery recommendations
- Cable current rating
Step 10: Test the solar installation
Before closing panels, hiding cables or going on a trip, test the system. Use the charge controller display or app if it has one. A multimeter is also useful for basic checks.
But above all, this article is meant to help you choose the right level from the start. If you want to go deeper into installation, sizing and technical details, we recommend our more detailed guide.
- Are the fuses installed correctly?
- Is the cable gland sealed?
- Is the panel physically secure?
- Are there any rattles when you move the panel gently?
- Does charging change when part of the panel is shaded?
- Is the controller turning on?
- Does it recognise the battery?
- Is solar input visible in daylight?
- Are the cables warm under normal use?
- Are all connectors fully seated?
Then check again after your first drive. This is very CamperPals advice from experice, bring tools. Not because your build is bad, but because your van is moving.
Common mistakes when installing solar panels on a campervan
1. Installing the panel where it gets shaded
A roof vent, rack or storage box can create more shading than you expect. Before fixing the panel, think about the full roof layout. Solar output is not only about panel size. Placement matters.
2. Forgetting waterproofing
A solar panel that charges well but leaks into the van is not a success. Take your time with cable entry, screw holes and sealant. Water damage is much more annoying than spending an extra hour on roof prep.
3. Hiding the charge controller forever
It is tempting to make everything invisible. It looks cleanx, but if you cannot reach the controller when needed, check the lights, reset settings or inspect cables later, you have made the system harder to live with.
Clean is good, but impossible to access is not.
4. Using random cable sizes
Do not choose cable size because “it looks thick enough”. Cable size depends on current, length and system design. If you are not sure, check the product manuals or ask someone experienced.
What we would do if installing solar
If we were installing solar on a first campervan again. Some point is not very glamorous, but it might be the most useful. Here is what we would:
- Choose the panel size before planning the roof layout.
- Place everything on the roof before drilling.
- Avoid shading from vents and roof boxes.
- Use a rigid panel unless the roof shape made that difficult.
- Keep the charge controller accessible.
- Buy more cable and small parts than we first thought.
- Take waterproofing seriously.
- Test the system before covering cables.
- Check everything again after the first drive.
- Not finish important electrical work tired the night before leaving.
FAQ – Solar panel for a campervan
Can I install solar panels on a campervan myself?
Yes, many self-builders install campervan solar panels themselves. The mechanical part is often manageable for careful DIY builders, but the electrical side still needs proper cable sizing, fuses and safe connections. If you are unsure, get help from someone experienced.
Is it better to glue or bolt solar panels to a campervan roof?
Both methods can work when done properly. Bolting can be very secure but creates holes that need careful sealing. A
dhesive mounting avoids some drilling but depends heavily on surface preparation and the correct adhesive. Follow the mounting product instructions and think about inspection and long-term safety.
Do I need an MPPT charge controller?
We recommend MPPT for most campervan solar setups. Useful for getting better charging performance from your solar panel.
Best for you if you want a more efficient and future-proof setup. Not ideal if you are building the smallest possible budget system and fully understand the limits of PWM.
Can I install campervan solar panels myself?
Many self-builders install their own solar panels, but you need to take electrical safety seriously. Use suitable fuses, cable sizes, connectors and mounting methods. If you are unsure, get help from someone experienced.
Do I need to drill into the van roof?
Not always. Some installations use adhesive mounting or roof bars. However, most fixed solar systems still need a cable entry point through the roof unless you route cables another way. Any hole in the roof must be sealed carefully.
Solar cable and MC4 connectors
Useful for connecting the solar panel to the charge controller.
Best for you if your kit does not include enough cable or if the supplied cables are not suitable for your layout.
Not ideal if you have not checked the required cable size and connector type.
How can we install solar panels cheaply and on a small budget?
A 100W panel is not the wrong choice, it is simply limited. For most campervans, a 200W solar panel with an MPPT charge controller is the best option.
Fuse holders and cable protection
Useful for making the system safer and more durable. Best for everyone building a permanent campervan electrical system.
Not ideal to skip. That is the whole point.
FAQ: Installing solar panels on a campervan
Tools and products worth comparing
Once you understand the installation, these are the product categories worth comparing.
Do not buy everything blindly. Check compatibility with your panel, battery, charge controller and roof.
Cable entry gland
Useful for routing solar cables through the roof while keeping the van waterproof.
Best for you if you are installing a fixed roof panel.
Not ideal if you are using only a portable panel with no roof cable entry.
Do solar panels need an air gap underneath?
Rigid panels usually benefit from some airflow underneath because heat can reduce performance. Flexible panels are often mounted closer to the roof, but this can make heat management more important.
Can I install campervan solar panels myself?
Many self-builders install their own solar panels, but you need to take electrical safety seriously. Use suitable fuses, cable sizes, connectors and mounting methods. If you are unsure, get help from someone experienced.
Solar mounting brackets or roof rails
Useful if you are installing a rigid solar panel.
Best for you if you want a secure, inspectable and more ventilated installation. Not ideal if your roof shape makes rigid mounting difficult.
Where should I place solar panels on a campervan roof?
Place the panel where it gets as little shade as possible and does not interfere with roof vents, racks, boxes or future upgrades. Also think about cable routing and whether you can inspect or clean the panel later.
How can we install solar panels cheaply and on a small budget?
A 100W panel is not the wrong choice, it is simply limited. For most campervans, a 200W solar panel with an MPPT charge controller is the best option.
What is a cable entry gland?
A cable entry gland is a waterproof fitting that lets solar cables pass through the roof into the van. It helps protect the cable entry point from rain and should be installed carefully.
Do I need fuses for campervan solar panels?
In many campervan solar systems, yes. Fuse requirements depend on your system design, but fuse protection between the charge controller and battery is common. Check your component manuals or ask someone experienced.
What should I read next?
If you are building your full electrical system or want to understand how the solar panel works together with the rest of the vehicle, these are good next steps:
Solar Energy & Solar Panel Guide for Campervans
If you want to go deeper into sizing, installation and solar theory, read our solar energy and solar panel guide for campervans.
Best Leisure Battery for a Campervan – Complete Guide 2026
If you are choosing the battery to pair with your solar panel, read our best leisure battery for a campervan guide.
Electrical System & Leisure Battery for Campervans
If you are still planning your full setup, start with our campervan electrical system guide.
