Motorhome & Campervan Solar Panels: Complete UK Guide
A solar panel kit lets you wild camp off-grid for days or weeks at a time without a hookup. With a sensibly sized 200–400W system and a lithium leisure battery, most UK motorhomers can run lights, fridge, water pump, laptop, and phones indefinitely.
Quick Answer
A typical UK motorhome needs 100–400W of solar panels paired with a 100–200Ah lithium leisure battery. A simple 100W kit (panel + MPPT controller + cabling) costs £150–£300 and replaces what a 12V fridge uses on a sunny day. A premium 400W system with lithium battery costs £1,200–£2,500 and supports off-grid living year-round. Flexible panels are popular for low-profile installs but rigid panels last longer (25 vs 10 years). MPPT charge controllers extract 20–30% more energy than cheaper PWM controllers and pay back quickly.
How many solar panels does a motorhome need?
Sizing depends on what you actually use. Total up your daily energy consumption in amp-hours (Ah at 12V), then size the panel to replace that — allowing for UK cloud cover, winter sun angle, and battery efficiency.
| Use case | Daily consumption | Recommended panel size | Battery |
|---|---|---|---|
| Weekend trips with hookup top-up | ~20Ah/day (lights, USB, water pump) | 100W | 100Ah AGM |
| Standard touring (12V fridge) | ~50–70Ah/day | 200–300W | 100–150Ah lithium |
| Full-time / long off-grid | ~80–120Ah/day (fridge, laptop, kettle) | 400W+ | 200Ah lithium |
| Winter use (low sun) | Same as above | +50–100% to compensate for short days | Larger lithium bank |
In the UK, a 100W panel realistically generates around 30Ah/day in summer and just 5–10Ah/day in December. Always size for your worst-case period if you plan to use the van year-round.
How much do motorhome solar panels cost in the UK?
| System | Components | Total cost (2026) |
|---|---|---|
| 100W starter kit | 1×100W panel, 10A MPPT, cabling | £150–£300 |
| 200W standard | 2×100W or 1×200W panel, 20A MPPT | £300–£550 |
| 300W comfort | 3×100W panels, 30A MPPT, monitor | £450–£800 |
| 400W full off-grid | 4×100W panels, 40A MPPT, BMV monitor | £600–£1,200 |
| Premium 400W + lithium battery | 4×100W, MPPT, 200Ah lithium, inverter | £1,200–£2,500 |
Costs assume DIY installation. Professional fitting adds £200–£500 depending on complexity. VAT is 20% on motorhome solar (vehicles do not qualify for the 0% domestic rate).
Flexible vs rigid panels for motorhomes
Flexible panels
Bond directly to the roof with adhesive. Sit almost flush (2–3mm), so they don’t add height for low ferries or car parks.
Pros
- Minimal height profile
- Lightweight (1.5–3kg)
- No drilling required
Cons
- 10–15 year lifespan
- Heat build-up reduces output 10–25%
- Not removable / repositionable
Rigid panels
Bolted onto Z-brackets with a 30–50mm air gap underneath. The standard for UK motorhomes.
Pros
- 25–30 year lifespan
- Air gap keeps panels cool, higher output
- Better warranties (10–25 years)
Cons
- Adds 30–50mm height
- Heavier (10–15kg)
- Requires drilling or roof rail mount
Our recommendation: rigid for most UK motorhomes — longer life, better cooling, easier to upgrade. Choose flexible only if you have a low-clearance vehicle or curved roof.
MPPT vs PWM charge controllers
The charge controller sits between the panel and the battery, regulating voltage and current to charge the battery safely. The two technologies are PWM (cheap, less efficient) and MPPT (more expensive, more efficient).
| PWM | MPPT | |
|---|---|---|
| Efficiency | ~75% | 92–98% |
| Cost (20A) | £15–£30 | £60–£150 |
| Cold-weather performance | Poor | Excellent |
| Higher-voltage panels | No (must match battery voltage) | Yes (24V/36V/48V panels OK) |
For anything above 100W, MPPT is the right call. The extra 20–30% energy harvest pays back the price difference within the first year. Recommended brands: Victron BlueSolar, Renogy Rover, EPEVER Tracer.
DIY installation overview
- Plan your layout. Avoid skylights, vents, and AC units. Leave space to walk safely if you need to clean panels. Consider where cables will enter the van (typically through a gland on the roof).
- Mount the panels. Rigid panels: bolt Z-brackets through reinforced roof points (consult your van’s manual). Flexible: clean the roof thoroughly, dry, then bond with Sikaflex 252 or VHB tape.
- Run cables. Use 4mm² or 6mm² solar cable. Bring through a waterproof gland (e.g. Scanstrut DS16) sealed with Sikaflex 221.
- Wire to MPPT. Panel positive to MPPT PV+, panel negative to MPPT PV-. Then MPPT BAT+/- directly to the leisure battery (with an inline fuse close to the battery).
- Configure for battery type. Set the MPPT for AGM, gel, or lithium — this controls bulk/absorption/float voltages. Wrong setting can damage the battery.
- Test & commission. Check voltage at the panel and battery, watch the MPPT display for bulk-charge state under sun, and verify it switches to float when the battery is full.
Motorhome Solar Panels: FAQ
How many solar panels do I need on a motorhome?
For a typical UK motorhome with a 12V fridge, 200–300W is the sweet spot. Weekend-only users can get away with 100W. Full-timers and winter campers benefit from 400W+ systems with a lithium battery bank.
How much do motorhome solar panels cost in the UK?
A 100W starter kit costs £150–£300, a 200W system £300–£550, a 400W full off-grid setup £600–£1,200, and a premium 400W kit with lithium battery £1,200–£2,500. Installation adds £200–£500 if not DIY.
Can I install motorhome solar panels myself?
Yes — solar wiring is 12V DC and within DIY territory for anyone comfortable with basic auto-electrics. The hardest parts are roof sealing (use Sikaflex, not silicone) and correct MPPT configuration for your battery type.
Are flexible or rigid solar panels better for motorhomes?
Rigid panels are better for most UK motorhomes — they last 25+ years vs 10–15 for flexible, run cooler thanks to the air gap underneath, and have stronger warranties. Choose flexible only if profile height matters or you have a curved roof.
Do motorhome solar panels work in winter?
Yes, but output drops sharply. A 100W panel that produces 30Ah/day in June may only produce 5–10Ah/day in December. If you camp in winter, oversize the panel by 50–100% or supplement with shore power and engine charging.
What size MPPT controller do I need?
Divide panel wattage by 12V to get max amps, then add 25% headroom: 200W → ~17A → 20A MPPT. 400W → ~33A → 40A MPPT. Victron, Renogy, and EPEVER are reliable brands.
Should I get lithium or AGM leisure batteries?
Lithium (LiFePO4) is the better long-term choice — usable capacity is 90% (vs 50% for AGM), lifespan is 10+ years (vs 3–5), and they charge faster. Cost is 2–3× upfront, but cost per usable kWh over the battery life is similar or lower.
Can I run a 230V kettle from motorhome solar?
Only with a large inverter (1000W+) and substantial battery bank. A kettle uses 2–3kWh which would drain a 100Ah lithium battery in one boil. Most motorhomers cook on gas and stick to low-power 12V appliances.
Related Guides
Caravan & Motorhome Solar
Off-grid kits for caravans, motorhomes, and campervans.
Flexible Solar Panels
Flexible solar panel costs, types, best uses for campervans, boats, and curved roofs.
Portable Solar Panels
Portable solar for camping, campervans, and caravans: types, sizing, and top picks.
Off-Grid Solar
Off-grid solar systems: costs, sizing, components, and setup guide.
Sources
- Caravan and Motorhome Club — Off-grid touring guidance — caravanclub.co.uk
- Victron Energy — MPPT solar charge controller manuals — victronenergy.com
Last updated: May 2026.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
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