Automatic Generator Changovers

Yes. It is possible with a generator in adequate power.

However if there are three phase motors in your circuit, you must switch them off automatically before the generator starts. Otherwise either the motors or the generator may burn.

There are many sophisticated changeover systems. You do the easiest one.

Simply use a pair of AC contactors (Preferrably mechanically interlocking each other) for changeover purpose. One for the mains supply and the other for the generator.

Bridge three power contacts of the Generator contactor at the generator side.

Supply the A1-A2 coil from the mains supply for the mains contactor.

Supply the A1-A2 coil from the generator for the generator contactor.

And use an additional relay to release the generator contactor when mains voltage is avilable. (locate it's NC contact on the coil path of generator contactor.

Brief info given above is only submitted to give an idea about the feasibility of the system and not adequate to start anything.

You must collect more precise info before any application.

Kindest Regards

If however you do need to run any three phase equipment you can use a rotoverter to convert some of your single phase to three phase.

Brilliant. Good idea.

Then he can run any of the three phase motor he has.

Could you please send me some links for such Rotoverter's.

It is not well known here in our markets.

Kindest Regards

This website looks like it would be able to help you out. www.ronkelectric.com Good luck and remember that since induction motors are going to be something less than 1.0 power factor you could help your efficiency out by trying some power factor correction capacitors out with the motor(s). You can use motor run capacitors that are rated for at least the voltages present, and it will most likely be a trial and error situation to find the motor's sweet spot (least amperage drawn). This will also minimise the draw on your generator and make both the generator and motor run cooler for a specific load than they would uncorrected. If this does you any good, I would welcome an E-mail telling me about it.