Kohler 25/30 kw 3 phase [RE-wrenches]

[Drake Chamberlin - Electrical Energy]

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Hi Wrenches,

So far, we haven't been able to turn up an exciter coil for the 3 phase 
Kohler generator. Also, we are getting cold feet about the responsibility 
involved.  The customer would be looking at an expensive rebuild, and if a 
used part we found didn't hold up, it wouldn't be a good situation.

A new possible strategy is evolving.  What if we kept the generator 3 phase 
and fed the two SW4024 inverters from 2 phases of the three phase.  On the 
third phase, we would put a 24 volt battery charger.

The battery charger would be set to pull a little more current than the 
chargers on the inverters, to offset any house loads that were drawing 
power.

One possible concern about this arrangement is that the phase angle between 
the two Trace inverters would not be 180 degrees, but 120 degrees.  Would 
this create any problems with the inverters?

I assume that since each inverter is seeing a line to neutral load, the 
inverters themselves would get a full 120 VAC from the generator.

Another issue is that when the generator was running and feeding the loads 
through the transfer switches of the SW4024s, that the voltage would be 208 
rather than 240.  This would seem alright so  long as any 240 VAC loads 
were compatible with 208, and that they would be small enough to not 
imbalance the generator.

So the big question would seem to be, "can stacked inverters operate off 2 
phases of a 3 phase 120/208 generator?"

Another question is "how close does the load balance between phases need to 
be on a 3 phase generator?"

A third question is "have we missed anything?"

Thanks you.

Drake

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