Upgrading Your Caravan Solar Panels for Off-Grid Touring

Key Takeaways

• Power Capacity: A 100W panel is usually sufficient for maintaining a battery, but 200W+ is needed for genuine off-grid touring in the UK.
• Efficiency: MPPT controllers are up to 30 per cent more efficient than cheaper PWM alternatives, especially in the UK's variable weather.
• Panel Types: Rigid panels offer better longevity and cooling, whilst flexible panels are lighter for weight-sensitive campervans.
• Cost Savings: Upgrading your solar is the most effective way to reduce campsite "daily hook-up" fees and increase independence.
• Professional Fitment: Expert installation is recommended to ensure roof seals remain watertight and electrical systems are fused correctly.

The 2026 touring season is seeing a significant shift towards "wilder" camping. With campsite fees for electric hook-up (EHU) rising, many caravanners are looking to solar power to regain their independence. Whilst many modern caravans from Bailey or Coachman come with a small factory-fitted panel, these are often only designed to keep the battery topped up during storage. For those who want to run a 12V fridge, charge e-bikes, or watch TV off-grid this June, a solar upgrade is a game-changer. At RoamWorthy, our verification team focuses on the technical efficiency that matters in the real world.

Calculating Your Solar Needs: The 2026 Power Audit

Before buying panels, you must perform a power audit. In mid-summer, a 100W solar panel will produce roughly 30-40 Amp-hours (Ah) of power on a sunny day. If your daily consumption (lights, water pump, charging phones) is 25Ah, a 100W panel is enough. However, if you add a compressor fridge (common in many 2026 models like the Swift Basecamp Plus) or use an inverter for a laptop, your needs will jump to 60Ah or more.

Appliance	Estimated Daily Usage (Ah)	Solar Requirement (Summer)
LED Lights & Water Pump	5-10Ah	50W Panel
Smartphone & Tablet Charging	10-15Ah	80W Panel
12V Compressor Fridge	30-50Ah	150W+ Panel
Inverter (Laptop/Coffee Machine)	40Ah+	250W+ Panel

For total peace of mind during a UK summer, we recommend a minimum of 200W of solar paired with a high-quality battery. Read our lithium battery guide to see how the two systems work together. When planning your layout, consider how different caravan layouts might affect roof space for larger arrays.

Rigid vs. Flexible Panels: Which is Right for Your Roof?

Rigid Panels: These are mounted on brackets, allowing air to circulate underneath. This airflow keeps the panel cool, which is vital as solar efficiency drops as the panel gets hot. They are heavier but very durable. For larger caravans like the Bailey Unicorn Cartagena or the Bailey Pegasus Grande Gt75 Portofino, these are the industry standard.

Flexible Panels: These are glued directly to the roof. They are incredibly light and aerodynamically "invisible," making them popular for small campervans like the Volkswagen California or Mercedes-Benz Marco Polo. However, they can suffer from heat degradation and are harder to replace if they fail. For a standard caravan, rigid panels are usually the better long-term investment. Always account for this extra mass in your payload calculations.

The Importance of the MPPT Controller

The solar controller is the brain of your system. Many budget setups use PWM (Pulse Width Modulation) controllers, which simply clip the voltage from the panel. For the 2026 season, you should insist on an MPPT (Maximum Power Point Tracking) controller. MPPT technology actively matches the panel output to the battery's needs, harvesting up to 30 per cent more energy, especially on cloudy days. Brands like Victron Energy also offer Bluetooth monitoring, so you can see exactly how much sun you are catching from your smartphone.

Professional Installation and Sourcing

If your current van feels underpowered, use our Find a Dealer tool to locate a workshop that specialises in solar retrofitting. If you're looking for a van that is already "Off-Grid Ready," browse our caravan models and use the filters to find high-spec models like the Bailey Alicanto, Coachman Laser 665, or Bailey Pegasus Bologna. Those considering a motorhome transition should also use our Motorhome Weight Checker to ensure solar additions don't compromise legal limits.

Frequently Asked Questions