I am in need of the proper method of connection for a Onan 8k QD generator into a Victron 100a Autotransformer. It will then go through a Auto Transfer Switch that my 50a shore power also goes through, and then on to a Bluetti RV5. I am aware the RV5 doesn’t pass through 240v, I need the split phase into the RV5 so I can use the quick charge capabilities.
The Onan has 2 hot legs of single phase 120v power. I read that something special might need to be done with the neutral from the generator? I have also read conflicting info that if you combine both legs from the generator to create one it can cause error codes at the gen and shut it down.
Is this for an RV or a yacht?
Generally it is the shore power that goes through the isolating transformer, not the generator power.
For the generator, The two 120V outputs can usually be easily combined for a 120-0-120V split phase output. Or IF they are isolated windings, then it would be possible to combine them in parallel for a single 120V source at twice the current.
Doing this is best left to an expert - though it is possible to check with a suitable voltmeter.
The usual warnings that 120 / 240V power is dangerous, and inappropriate connections can lead to injury, loss of life or damage to equipment.