Solar Panel Sizing Guide
100W vs 200W vs 400W: Solar Panel Sizing Guide Published: May 20, 2026 · 4 products reviewed · 12 min read Solar panels are the single most important addition...
# 100W vs 200W vs 400W: Solar Panel Sizing Guide
*Published: May 20, 2026 · 4 products reviewed · 12 min read*
Solar panels are the single most important addition to any off-grid van life setup. They keep your batteries charged, power your devices, and let you boondock in peace — even in the UK's famously cloudy weather.
This guide reviews the best solar panels available on Amazon UK, from rigid panels you bolt to the roof to flexible, foldable options for temporary setups.
### Choosing Solar Panels for the UK
**Wattage:** 100W is the minimum for UK use. 200W+ is recommended for full-time living. The UK averages 3–4 peak sun hours in winter, 6–7 in summer.
**Panel Type:** Rigid mono crystalline (most efficient, permanent), flexible (lightweight, adhesive-mount), or foldable/portable (temporary).
**Efficiency:** Look for 22%+ efficiency. Monocrystalline PERC cells deliver the best UK performance.
**IP Rating:** IP65 minimum for UK weather. IP68 for full waterproofing.
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