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Originally Posted by UFO
It's hard to make a VW bus less aerodynamic.
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With a 0.44 CD, it's really no worse than a lot of much newer vans, SUVs and pickups.
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Driving the car at highway speeds (it can go 80 miles per hour) requires much more power than what the panels can generate in full sun.
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My guess is the solar panels don't make enough power to run continuously at 10mph.
It's a specialised vehicle, drive a short distance at low speed to work, leave it parked all day. If the battery were depleted completely at the end of a journey, it wouldn't be ready for a return trip for quite some time.