Campervan & motorhome equipment · United Kingdom
Solar Panels
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Foldable panels that live in the van and come out when you park.
Why portable beats roof mounted
- Park in shade, put the panel in sun. In July that is worth more than the extra wattage a hot roof array would give you.
- Angle it. Tilting toward a low winter sun roughly doubles output against a flat roof mount.
- No holes in the roof. No sealant to fail in five years, no change to your vehicle height, no effect on resale.
The trade off is honest: a portable panel generates nothing while you drive, and you have to remember to pack it away.
Realistic UK output
Rated output is a laboratory figure measured under ideal conditions. These are the numbers that matter, for a panel propped and roughly angled.
| Panel | June clear | June overcast | Apr and Sep clear | Dec clear |
|---|---|---|---|---|
| 100W | 400 to 500Wh | 120 to 180Wh | 250 to 350Wh | 70 to 115Wh |
| 200W | 800 to 1,000Wh | 230 to 350Wh | 500 to 700Wh | 140 to 230Wh |
| 350W | 1,400 to 1,750Wh | 400 to 600Wh | 900 to 1,200Wh | 250 to 400Wh |
Which size
A weekend build draws 400 to 600Wh a day, so a 200W panel covers it from April to September. A full time build draws around 850Wh, which needs 350W to stay net positive through the shoulder seasons.
No portable panel carries a UK van through December. That is what alternator charging is for, and it costs less than a second panel.