How many watts of solar do I need for a motorhome?

100W for basic use (lights + phone charging). 200W for standard use (+ fridge + laptop). 300–400W for full off-grid living. Most UK motorhomers find 200W is sufficient for spring-to-autumn trips.

Can I install solar panels on a motorhome myself?

Yes — motorhome solar is 12V DC and suitable for DIY installation. Mount the panel with corner brackets or adhesive, run cable through a roof gland, and connect via a charge controller to your leisure battery. Takes 3–6 hours for a first install.

Do solar panels work on motorhomes in the UK?

Yes. UK summer provides 5–6 peak sun hours, which is plenty for motorhome needs. A 200W panel generates 600–1,000Wh/day in summer — enough for lights, fridge, and devices. Winter output is lower (100–300Wh/day) and may require hook-up supplementation.

How much does motorhome solar cost?

A complete 200W system (panel, MPPT controller, wiring, cable gland) costs £300–£500 DIY installed. Professional installation adds £200–£500 labour. A 100Ah lithium leisure battery adds £300–£800 if needed.

Solar Panels for Motorhome: Costs & Installation

Last updated: 18 March 2026

Independently written

Solar energy system providing off-grid power for motorhome and camping — Motorhome solar lets you camp off-grid — charging your leisure battery from sunshine.

How much do motorhome solar panels cost?

Motorhome solar panels cost £200–£1,000 for a 100–400W system. A 200W panel with a charge controller and wiring kit costs approximately £300–£500 and generates enough to run LED lights, charge devices, power a 12V fridge, and keep your leisure battery topped up. Installation is straightforward — panels mount on the roof with adhesive or brackets and connect to your leisure battery through a charge controller.

Sizing: How Much Solar Does a Motorhome Need?

Typical motorhome electricity consumption: - LED lights (6 hours): 30Wh - Phone/tablet charging (2 devices): 30Wh - 12V compressor fridge (24 hours): 400–600Wh - Water pump (occasional): 20Wh - Laptop (3 hours): 150Wh - TV (3 hours): 120Wh - Total typical daily use: 750–950Wh

Solar output in UK summer (per 100W panel): - Sunny day: 400–500Wh - Partly cloudy: 250–350Wh - Overcast: 100–200Wh

Recommended system sizes:

| Usage Level | Panel Size | Cost | Suits | |-----------|-----------|------|-------| | Basic (lights + phones) | 100W | £150–£250 | Weekend trips | | Standard (+ fridge + laptop) | 200W | £300–£500 | Week-long trips | | Full off-grid (all above + TV) | 300–400W | £500–£1,000 | Extended travel |

Source: Motorhome electrical consumption data; panel manufacturer specifications.

How motorhome solar works — panel to charge controller to battery — Motorhome solar is simpler than home solar — panel → charge controller → battery → appliances.

Types of Motorhome Solar Panels

Rigid monocrystalline (most popular): - Efficiency: 20–22% - Weight: 8–12kg per 200W panel - Mount: roof brackets or corner mounts - Lifespan: 15–20 years - Best for: permanent rooftop installation - Cost: £150–£300 per 200W panel

Flexible (thin film or lightweight mono): - Efficiency: 15–20% - Weight: 2–4kg per 200W panel - Mount: adhesive directly to roof (no drilling) - Lifespan: 5–10 years (shorter than rigid) - Best for: curved roofs, pop-top vans, weight-sensitive builds - Cost: £150–£350 per 200W panel

Portable/folding: - Efficiency: 18–22% - Weight: 5–8kg per 200W - Mount: none — place on ground, connect via cable - Best for: campervans with limited roof space, renters who cannot modify vehicle - Cost: £200–£400 per 200W

Recommendation: Rigid monocrystalline for permanent installation on standard motorhomes. Flexible for campervans and pop-tops. Portable for supplementary power or vehicles you cannot modify.

Source: Motorhome panel manufacturer data.

Solar panel types — rigid vs flexible vs portable for motorhomes — Rigid panels last longest, flexible panels suit curved surfaces, portable panels offer flexibility.

Essential Components

A complete motorhome solar setup includes:

Solar panel(s) — 100–400W depending on needs
MPPT charge controller — regulates charging to protect your battery. MPPT is 15–20% more efficient than PWM. Cost: £40–£150.
Wiring — 4mm² or 6mm² solar cable between panel and controller, plus fuses and connectors. Cost: £20–£50.
MC4 connectors — weatherproof panel connectors (usually included with panel). Cost: £5–£15 if buying separately.
Cable gland — waterproof entry point for cables passing through the roof. Cost: £10–£25.
Leisure battery — if you do not already have one, a 100–200Ah lithium battery costs £300–£800. AGM alternatives: £100–£250.
Battery monitor (optional) — shows charge level, consumption, and solar input. Cost: £30–£80.
Inverter (optional) — converts 12V DC to 230V AC for mains appliances. 300W: £40–£80. 1000W: £100–£200.

DIY vs Professional Installation

Motorhome solar is one of the few solar applications where DIY is practical and recommended:

DIY installation (most common): - Mounting: drill 4 holes for corner brackets (or use adhesive for no-drill) - Wiring: connect panel → charge controller → battery (12V DC, low risk) - Time: 3–6 hours for a first-time installer - Cost saving: £100–£300 vs professional - Skill level: basic DIY (drilling, crimping connectors, cable routing)

Professional installation: - Cost: £200–£500 labour on top of components - Useful if: you are uncomfortable on the roof, want a warranty, or have a complex multi-panel setup - Motorhome dealers and specialist van converters offer solar installation

Important: Motorhome solar is 12V/24V DC — far less dangerous than mains voltage (230V AC). There is no need for an electrician for the DC circuit. However, if you add a 230V inverter, the AC wiring should comply with relevant standards.

Source: Motorhome DIY solar guides; NCC electrical standards for leisure vehicles.

Solar charging a leisure battery during the day for evening use — Solar charges your leisure battery during the day — providing power all evening and night.

UK Performance: What to Expect

Motorhome solar output in the UK varies dramatically by season:

200W panel, UK summer (June): - Sunny day: 800–1,000Wh - Partly cloudy: 500–700Wh - Overcast: 200–400Wh

200W panel, UK spring/autumn: - Sunny day: 500–700Wh - Cloudy: 150–300Wh

200W panel, UK winter (December): - Best case: 200–350Wh - Typical: 80–200Wh

Practical reality: In UK summer, a 200W panel comfortably powers lights, fridge, devices, and a laptop. In winter, it struggles to keep the fridge running continuously. Winter motorhoming in the UK typically requires hook-up or a larger system (300–400W).

If you primarily camp April–October, 200W is sufficient. If you travel year-round, consider 300–400W.

Source: UK solar irradiance data applied to motorhome panels.

UK sun path affecting motorhome solar output by season — Summer UK camping generates plenty of solar power — winter camping requires a larger system.

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