My 48v system is not grounded. General consensus seems to be that this is best. As for grounding the controller, I think tech support at Sevcon can provide a better answer on whether it should be grounded or not. My Kelly controller is not grounded. My motor casing and rotor shaft are incidentally grounded, of course. However phase windings, power supply cables and 48v bank are all floating. Some owners also use a flex coupling to isolate the motor shaft and casing from ground as well, though I don't think it is necessary.
---In electricboats@yahoogroups.com, <mattkaine@...> wrote :
So I just installed a 10kw motor Kit from Trunderstruck EV on my 1976 Islander I-28. I am very happy with the install, works awesome. I am however not sure on best method for grounding new power system. So the current set up is this...I have 2x 12v house batteries with a common ground bus, my 120vAC shore power connects its ground to same ground bus. Now where I am not sure...the 48v motor system consists of 8x 6vDC batteries in series>Power relay>Sevcon Gen4 Controller>motor. Ground bypasses the relay and goes straight to Sevcon. Should I connect 48v bank to 12v ground bus? Should I run a separate ground from motor frame to ground bus?
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