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Controller advice.

Hey, I I have taken on a project to revamp a electric scooter originally rated at 48v 500w. Having been an auto mechanic for 20-plus years I know combustion engines very well, but the electric ride is relatively new to me although I think I know the basics. I would like to upgrade the batteries the controller and the motor to 72 volts. I currently have a 60 volt 1000w power supply that I would like to use temporarily. My question is, if a controller is advertised at 48v/60v/72v 3000w can it be used for 60v 1000w and also when I upgrade to 72 volt as long as I don't exceed 3000 Watts . And also are most controllers compatible with lithium ion batteries? Thanks for your help.

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