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| Out of the total battery capacity, what little surface area that could be solar cells is insignificant. The Tesla Model S has a 60kWh battery (with I think an 80 kWh optional). Assuming the entire top of the car was covered on solar cells you'd get about 100 square feet of surface area. You can expect about 9 watts per square foot for solar so that's 900 watts output or 4.5 kWh per day (assuming 5 hours of full sunlight which is about average for the beltline of the US).
So to fully charge the battery, you'd need at least 13 days of good sunlight. Considering that the top of the car isn't facing the sun correctly and other losses, it'd actually be much more than that. | |
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Telsa electric car
