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It's basically 3 separate heating elements together, so you can vary how much heat it puts out by turning on one, two, or all three elements, without any fancy circuitry. I wasn't expecting that; originally I was going to use a "PWM" (pulse width modulation) to vary how much power it would get.
Plenty of options here.
I like the idea - for those of us without regenerative braking - to use the otherwise wasted braking power to generate heat for use in the cabin. It would be regen braking of a sort....just not going back in to the batteries. It would be an interesting challenge to rig it up, though. You'd need to dissipate/collect a lot of energy quickly for it to be any use.
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