Campervan Solar Panel Mounting: Roof Brackets, Adhesive, or Tilt?

How you mount your solar panels to your campervan roof affects their performance, lifespan, and your van's aerodynamics. The three main options — brackets, adhesive, and tilt frames — each have distinct advantages depending on your panel type, van model, and priorities.

This guide is part of our campervan solar setup guide. For help choosing panels, see best solar panels for campervans.

Mounting Method Comparison

Z-Brackets (Most Popular)

Z-brackets are the most common mounting method for rigid panels on campervans. They are L-shaped aluminium brackets that bolt to the panel frame on one end and attach to the roof on the other, creating a natural air gap.

Advantages

• Simple to install — four brackets per panel
• Create a 40–60mm air gap for cooling
• Allow water to flow underneath for self-cleaning
• Strong when properly bonded or bolted
• Easy to remove panels later for roof access
• Inexpensive: £15–£30 per set

Installation Steps

1. Clean the roof thoroughly with isopropyl alcohol or panel wipe
2. Position the panel and mark bracket locations with masking tape
3. Bolt brackets to the panel frame using the pre-drilled holes (M6 bolts typically)
4. Apply Sikaflex 252 or 522 to the bracket base in a generous bead
5. Press the panel with brackets onto the marked positions
6. Weight the panel down or tape securely while the adhesive cures (24–48 hours)
7. Check alignment before the adhesive sets fully

Can I Drill Through the Roof?

You can, but most builders avoid it. Drilling creates potential leak points and complicates any future roof work. Sikaflex-bonded brackets are strong enough for motorway speeds and have been proven over years of campervan use.

If you do drill, use stainless steel self-tapping screws with a butyl rubber washer and seal generously with Sikaflex.

Corner Brackets

Similar to Z-brackets but attach at the four corners of the panel frame. They provide a slightly cleaner look and are often included in solar panel mounting kits.

When to Use Corner Brackets

• When your panel kit includes them
• When you want a slightly lower profile than Z-brackets
• For panels with standard corner mounting holes

The installation process is identical to Z-brackets.

Adhesive Mounting (Flexible Panels)

Flexible solar panels are designed to be bonded directly to the roof surface. This gives the lowest possible profile but sacrifices the air gap that helps with cooling.

For an in-depth look at flexible panels specifically, see can flexible panels handle campervan roof curves.

VHB (Very High Bond) Tape

3M VHB tape provides an incredibly strong bond without mixing adhesives.

Process:

1. Clean the roof and panel back with isopropyl alcohol
2. Apply VHB tape strips to the panel back (or a grid pattern)
3. Peel the backing and press the panel firmly onto the roof
4. Apply pressure across the entire surface

Pros: Clean application, instant tack, repositionable briefly Cons: Difficult to remove later, may not bond well to textured surfaces

Sikaflex Adhesive

Sikaflex 252 or a similar structural adhesive can bond flexible panels directly to the roof.

Process:

1. Clean both surfaces thoroughly
2. Apply Sikaflex in an S-pattern or grid to the panel back
3. Press onto the roof and weight down
4. Allow 24–48 hours to cure

Pros: Very strong bond, fills gaps on uneven surfaces, waterproof Cons: Messy, permanent (difficult to remove), long cure time

Roof Rack Mounting

If your van already has a roof rack, mounting panels to it is straightforward and provides an excellent air gap.

Advantages

• Large air gap for optimal cooling
• Easy to remove panels for access
• No bonding to the roof surface
• Can position panels optimally on the rack

Considerations

• Roof rack adds height and weight
• Can create wind noise at speed
• Rack itself may partially shade panels
• Need to route cables through the rack structure

Mount panels using bolts through the rack crossbars with rubber isolating washers to prevent galvanic corrosion.

Tilt Frames

Tilt frames allow you to angle panels towards the sun, dramatically improving output in winter or when the sun is low.

When Tilt Frames Make Sense

• You camp in one spot for extended periods
• You travel in winter when the sun is low
• You want to maximise output per panel
• Your roof space is very limited

Output Improvement

In a UK winter, tilting a panel to 60° can increase output by 60–80% compared to flat mounting. In summer, the improvement is smaller (5–15%) because the sun is already high.

Disadvantages

• Panels must be lowered for driving (wind loading)
• Mechanical complexity — hinges, struts, locks
• Higher profile when deployed
• Cannot use while moving
• More expensive than flat mounting

DIY Tilt Options

Many builders create simple tilt mechanisms using:

• Piano hinges along one edge of the panel
• Gas struts or adjustable arms for the tilt angle
• Quick-release pins to secure for travel

Roof Preparation

Regardless of mounting method, proper roof preparation is essential.

Surface Cleaning

1. Wash the roof with soapy water to remove loose dirt
2. Wipe with panel wipe or isopropyl alcohol to degrease
3. Lightly sand with 180-grit sandpaper for better adhesion (optional but recommended)
4. Final wipe with isopropyl alcohol
5. Let it dry completely before applying adhesive

Planning the Layout

Before mounting anything:

• Measure your available roof space carefully
• Account for roof vents, antennas, roof bars, and access hatches
• Leave 50–100mm clearance from all edges for drainage
• Mark panel positions with masking tape
• Consider cable routing paths from panels to the roof entry point

See campervan roof space by van model for specific dimensions.

Cable Entry

Wherever you mount your panels, you need to route the cables through the roof to the charge controller inside. This requires either:

• A cable gland (most common)
• A roof entry box
• Routing through an existing roof penetration

For detailed cable entry instructions, see how to route solar cables through your van roof.

Mounting Tips by Van Type

Flat Metal Roof (Transit, Sprinter, Crafter)

The easiest surface to work with. Flat, smooth metal bonds well with Sikaflex. Z-brackets and corner brackets work perfectly. Most flexible panels sit flat without issues.

Pop-Top Vans (VW California, Nugget)

Limited roof space due to the pop-top mechanism. Panels must be mounted on the fixed rear section of the roof. Weight is a bigger concern — lighter flexible panels may be preferred to avoid stressing the pop-top mechanism.

Fibreglass High-Tops

Some high-top roofs have compound curves that make rigid panel mounting difficult. Flexible panels conform better to these curves. If using rigid panels, check that the brackets can accommodate the roof curve without stressing the panel frame.

GRP/Fibreglass Roofs

Bond well with Sikaflex but cannot handle heavy point loads. Spread the mounting load across a larger area using backing plates inside the roof.

Frequently Asked Questions

Will solar panels damage my van's roof?

Sikaflex-bonded brackets do not damage the roof and can be removed later (with some effort). Through-bolt mounting creates permanent holes. Adhesive-mounted flexible panels can be very difficult to remove without damaging the paint.

How fast can I drive with roof-mounted solar panels?

Properly mounted panels handle motorway speeds (70+ mph) without issues. Thousands of campervans drive daily at speed with roof-mounted solar. Ensure your mounting adhesive has fully cured before driving.

Do I need to earth/ground my solar panels?

In the UK, there is no strict requirement to earth the frames of 12V solar panels on a campervan. However, bonding the frames to the van chassis is good practice and provides an additional safety layer. Use a copper earth wire from one panel frame bolt to a chassis point.

Can I mount panels on the side of my van?

Vertical panels produce much less energy than roof-mounted panels due to the angle. However, side-mounted panels can catch morning or evening sun. Some van lifers mount small panels on fold-out side brackets for supplementary power.

How many panels fit on my van's roof?

This depends on your van model, roof furniture, and panel dimensions. See campervan roof space by van model for specific figures.

Summary

For most rigid panel installations on standard campervans, Z-brackets bonded with Sikaflex are the best combination of simplicity, performance, and security. The air gap improves panel efficiency, the bond is motorway-proof, and the panels can be removed if needed. For flexible panels, adhesive mounting is the only option, but be aware of the heat penalty from the lack of air gap. Tilt frames are worth considering if you camp stationary in winter or have limited roof space.