Van Solar by Location
The same panel makes very different power in Arizona and in the UK, and the gap is widest in winter. Each page below sizes a reference build against that region's real peak sun hours.
Pacific Northwest
PNW winter sun is low. See how much solar and battery you really need.
3.8 peak sun hours annual · 1.5 winter
Arizona
Arizona has the best sun in the US. See how little solar you can get away with.
6.5 peak sun hours annual · 4.8 winter
Florida
Florida sun is strong but cloudy afternoons are common. Size for the gaps.
5.3 peak sun hours annual · 4.2 winter
United Kingdom
UK winter sun is very low. Plan for hookups and a bigger battery.
2.5 peak sun hours annual · 0.8 winter
Australia
Australia has excellent sun. Size for heat and long remote stretches.
5.5 peak sun hours annual · 4 winter
Why winter is the number that matters
Sizing an array on annual average sun produces a system that works from spring to autumn and leaves you short in December. If you travel year-round, size on the winter figure, or plan a second charging source — a DC-DC charger from the alternator is the usual answer. The calculator has an annual/winter toggle that does this for you, and battery sizing covers the autonomy side.