Hi Ghost, please allow me to intercede with this topic.

In my opinion, if you will buy a 3 phase generator, first, you have to determine what are the electrical equipment you needed to be powered by this generator and determine the total load current. You need to identify if these are single phase or 3 phase, then calculate the total current draw of all these tools. Once you determine the total current draw, multiply it by 3 times so that the generator will not stall during starting. Once you determine the calculated current, you can calculate the kilowatts and divide by .8 (power factor) to get the KVA.

If you are using a single phase tools, you cannot use 2 of the phases since the voltage is line to line, thus will give you higher voltage.

If for example, you have a 415V 3 phase generator Y connection, voltage distribution are as follows: L1 to L2 = 415V; L2 to L3 = 415V and L3 to L1 = 415V. L1 to Neutral = 239V L2 to Neutral = 239V and L3 to neutral = 239V. With these, using line to line (both phases) with a single phase tool is not feasible due to voltage difference.

However, 3 phase generator can be rewired from 3 phase Y connection, 3 phase delta connection or single phase connection.

My 2 cents.