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A typical Colorado commute of 30 miles a day uses about 9 kWh of charge. On a Denver roof, one 430 W panel makes around 1.7 kWh on an average day — so a commute costs roughly five to six extra panels.
Solar mode, explained
A charger with solar mode watches the export meter and only sends surplus power to the car. It charges more slowly at midday, but every mile comes from the roof instead of the grid.
When it pays
- Car at home in the day: solar mode covers most charging from spring to autumn.
- Car at work all day: a battery or an off-peak tariff does more than extra panels.
- Two cars: the 11.5 kW charger with load balancing keeps the main breaker happy.
The Home + EV kit pairs 20 panels with a 13.5 kWh battery and the Driveway 11.5 kW charger, so the evening charge comes from stored sun.
