Solar Panel
PV panel, solar array, roof solar, photovoltaic panel, solar charging, mono solar, poly solar
A solar panel is a photovoltaic panel fitted to a motorhome or caravan roof that converts sunlight into 12–24V DC electricity to charge leisure batteries and power 12V appliances directly.
A 200 W panel on a sunny summer day (7 peak hours) produces around 100 Ah. In overcast conditions or winter it produces 3–5× less. Monocrystalline panels outperform polycrystalline in low light. Flexible panels suit curved roofs but degrade faster than rigid ones. Paired with an MPPT charge controller the system delivers 10–30% more energy than with a PWM controller.
FAQ
How many solar panels does a motorhome need?
For summer off-grid camping, 200–400 W (1–2 panels) is sufficient. With high consumption (air conditioning, powerful inverter) you need 600–800 W. In winter, solar generation drops 3–5×, so 400+ W plus a DC-DC charger from the engine alternator is recommended.
How do you mount solar panels on a motorhome roof?
Fix them via L-brackets or roof rails using M6–M8 stainless steel bolts. Critical: prevent water ingress through holes using butyl tape or Dicor lap sealant. Route cables through a waterproof cable entry gland with a proper seal.
How do solar panels perform in winter and on cloudy days?
In winter, output falls by 30–70% depending on latitude. On very cloudy days, it can drop to 10–20% of maximum capacity. Well-designed systems therefore include another charging source: the alternator through a DC-DC charger, or a mains connection when available.