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I've been working with solar power systems putting one together for our off-grid property, and I've run some numbers.
Basis: 7.6kWh for a Ford Fusion Energi PHEV yields 20 mile range.
That's about 3 miles/kWh.
Panels flat on a roof or hood kinda suck for solar harvest unless you're in lower latitudes.
For summer, 5 hours of insolation is reasonable, winter 1.5.
In summer, 100W would get you 500Wh or about 1.5 miles of driving per day.
In winter, 100W would get you 150Wh or about 0.45 miles of driving per day.
This assumes the solar panels are exposed to the sun from sunrise to sunset.
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