Generator to power TT.

naturist wrote:
A 240 volt generator does NOT have two coils producing 120 volts, it has ONE coil producing 240 volts with a center tap so it will also produce 120 volts. Any attempt to combine the two is guaranteed to produce a massive short circuit and major damage.

It's a fact, the laws of physics say you CAN'T put 2 coils in a generator. You can put in one, or you can put in three, but two is impossible.

This is wrong. There are many generators that have two separate windings and can be connected for either 120 volts or 240 volts. Many Onans provide that option. I own two of them. My Onan CCK 4000W is normally connected to provide only 120V AC power to my RV. It has four wires at the output - one pair for each winding. I strap them in pairs to get 120V at 33.3A (the windings are in parallel). When a hurricane comes along and I need 240VAC for my well pump, I reverse one of the pairs to get 240VAC at 16.6A (the windings are in series and act like a center tapped single winding). I own another Onan (6500W) that I purchased wired for 120VAC and rewired for 240VAC.

I don't know if the Generac has the 120/240 rewiring capability, but it's certainly not impossible. For an Onan, it's easy to tell from the model number. The AC connect cover plate as well as the manual will have a wiring diagram for both 120 only and 120/240 configurations.

I'll also comment that in many generators that have the dual winding 120 or 120/240V capability, only one of the windings is monitored during voltage regulation. There is usually a warning in the manual that when you are using the generator to power unbalanced loads (all the load on one winding) you should connect the load to the monitored winding, not the unmonitored one.