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I wouldn't want to touch a 100 watt light bulb with my bare hand, let alone 5 of them.
225 instead of 500 watts sounds a lot better!
We really don't have to worry about going real high on the amps right now. By going with a higher voltage, you drop the battery amps by plenty, which keeps them happy.
My current controller is a 400 amp (peak) Curtis controller at 72 volts. Moving the same car at the same speed with 144v is only 200 amps.
In truth, a 144V 500 amp controller would give the same power as a 72V 1000 amp controller, only without roasting the batteries so much! (and needing as heavy cabling)
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