I installed a small 150 watt 12 volt 3 phase wind generator
some time ago on my Hunter
310 using the rear stainless steel
rails, 2 meter mast
and some clamps. It has a slip ring and three wires, which are the three phase electrical
I have a 3 core
cable running to my 3 phase rectifier and controller and batteries which seems to work okay, but given fickle winds, never got too much power out of it, at best 1-2 amps. Each phase shows around 9 volts AC when its spinnings.
A few days ago, whilst stepping on the board in a fair wind
, I got electric
shock (eg touching the rail and wet feet)
I check the rail and found it was isolated and not earthed/grounded.
I pulled the wind generator
off the boat, checked the inside wiring
and did an electric
drill test, which showed 6 amps being generated.
I also tested resistance to the generator
case / mast, which showed around 0.6 ohms on each phase, suggesting the stator wiring
is connected to the case.
After remounting it on the boat, I attached an earth wire to the rail to ground it, but the wind generator
slowed right down. Removing the earth it spun around "normally"
The question I have is for 3 phase wind generators, should the mast/ case be grounded / earthed or left isolated for it to work properly.
My guess is that it should be grounded / earthed (eg where else would it suck the electrons from), but this does not explain why the wind generator slowed right down when earthed.
Any suggestions / help would be appreciated.