To re-iterate, you have a 240/120 V 4-wire circuit and a 120 V circuit.

The only POSSIBLE thing you could do is to convert the 120V inverter output into a 240 center-tapped output by means of a transformer.

Two high rated 7.5 KVA instead of 2, but this is similar to what you would need with correct outdoor enclosure, etc. SQUARE D 7S6FIS Transformer 7.5kva

Grainger is Wholesale only.

That's more trouble than it's worth. Thanks for your advice. Guess I'll stick with the status quo.

True, but you might be able to pick up the required transformer surplus - cheap.

You need 2 KVA with a 120/240 input and 120/240 output such that you get 120 V in and 240 CT out.

If not mentioned, Jumping both hots could cause overloading on a Multi circuit(2 hots sharing 1 neutral).
If all you need is 120 for power outages, perhaps 1 leg would do, the one with most emergency circuits. Swap necessary ones from other leg to that phase as well.
When placing a circuit on the opposite phase, be sure to place other multicircuit wire on other phase.

Quote:

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Originally Posted by Stratmando

If not mentioned, Jumping both hots could cause overloading on a Multi circuit(2 hots sharing 1 neutral).
If all you need is 120 for power outages, perhaps 1 leg would do, the one with most emergency circuits. swap necessary ones from other leg to that phase as well.
When placing a circuit on the opposite phase, be sure to place other multicircuit wire on other phase.

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I don't see how this could cause circuit overloading. As I described earlier, the Yamaha generator is only capable of 2000w peak and 1600w sustained. Unless there's something I don't understand, the worst-case is I overload the generator and pop the protection circuit.

Then you're fine.