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| You could run three single phase fans at one time with one or three transformers. Each would load one phase on the generator. The transformer could be a single three phase transformer probably 480 to 240 three phase, or three single transformers or auto transformers 480 to 240 or 277 (if the generator is four wire with a neutral) to 240. Likely a new transformer set will cost more than the used genset. That's without changing the genset windings. Its not guaranteed that the voltage of a genset can be changed by connections. If it had an electronic voltage regulator, it might be possible to cut the voltage in half, cutting the power capacity in half also.
Very few 3 phase generators have worked well with single phase loads though there is a connection for the most versatile of winding arrangements that does, it still costs considerable capacity.
The best load is three phase, fans grouped in three near equal groups.
The remaining problem is whether the genset will start all the fans at once or if they will have to be started a few at a time.
Gerald J.
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can convert 480 volt 3ph genset to 220v 1ph?
