I’ve been playing with a new toy. A 3kw surplus gen set. Has a very cool little 4cly. 32cu inch air-cooled motor. Seems very good except the meter that registers % load doesn’t seem to be working. I was running a ½hp. grinder, a belt sander, a palm sander and an electric drill without it registering anything. The genset bogged a little when I plugged everything in too start that ½ hp. grinder and the gauge still didn’t register anything, although the hertz dipped when the engine bogged for a sec.
Anyway this puts out 110/220 - 60 hertz in single phase and 3 phase. I’m trying to understand the difference between the single and 3 phase, and everything I’ve read is not clear. My intent is to use this with an inverter charger, battery backup setup with about 850w of solar panels. I’ll run the genset a little in the morning and in the evening to top off the batteries if the grid is down.
Will I use the 3 phase to go to the inverter charger and still have the single phase plugs operable?

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89 300E
79 240D
72 Westy
63 Bug sunroof
85 Jeep CJ7
86 Chevy 6.2l diesel PU

"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane."
Marcus Aurelius