Hello all.
Am very tempted to buy a unit that generates 40KW on 480VAC 60 Hz 3phase. (I do not know if it is star or delta). My needs are just 240VAC split phase under 12KW
Is there a way to transform/modify the power outputted ?

 

You can buy a 15 kVA step down transformer for about $1500
https://www.northamericaphaseconverters.com/product/240-x-480-120-240-volt-1-phase-transformers/

 

Three-phase power can have the voltage changed using three single phase transformers, which for a given power level will probably cost less than a single three phase transformer. But I am not aware of a simple way to efficiently convert the total 3-phase power to the same total single phase power. Certainly it can be done but it is neither simple nor cheap.

 

Usually when you get something like that cheap it's because it's expensive to make it useful.

 

My needs are just 240VAC split phase under 12KW
Is there a way to transform/modify the power outputted ?

Three to single-phase transformers have a three-phase input and a single-phase output.
They are particularly handy when it is necessary to power a big single-phase load but only a three-phase system is available. The three to single-phase transformer allows an excellent distribution of the power absorbed by a single-phase load on all three phases.
https://fat-tec.com/trasformatore/three-to-single-phase-transformers/

 

Do you need the 240V split-phase to get both 120V and 240V?

You could use one single split-phase 240V-120V output transformer connected to one of the generator's three phase outputs.
You should be able to draw at least 10kW from the one phase.

 

Certainly the transformer scheme can work. but it is not cheap nor that simple.

 

Very simple, I have implemented it a few times, all a 3ph transformer is, is 3 single phase transformers mounted on the same frame.
There is no perceivable difference.

 

Hello all.
Am very tempted to buy a unit that generates 40KW on 480VAC 60 Hz 3phase. (I do not know if it is star or delta). My needs are just 240VAC split phase under 12KW
Is there a way to transform/modify the power outputted ?

Wire it "double delta"
https://www.stamford-avk.com/sites/stamfordavk/files/AGN154_D.pdf

 

A scheme not mentioned would be to feed the 480 volts/3phase into a full wave rectifier and the use an inverter to provide the desired 240 volt output. That would allow the alternator to deliver it's rated output under the most favorable conditions, It might possibly also be the most efficient, and certainly the inverter output transformer could provide whatever voltage and frequency was chosen. Of course, a 12 KW inverter with a 3phase 480 volt input is not a simple thing.