In very elementary terms, household power in the USA - and your generator - is supplied as single-phase 240 VAC with a "neutral". The voltage between either side of the 240 VAC wiring and the neutral is 120 VAC. Click on [url]http://en.wikipedia.org/wiki/Split_phase][U][COLOR=Blue]this link to Wikipedia[/COLOR][/U][/url] for a page that has a drawing of a typical transformer that powers a home. Your generator is essentially identically wired.
I'll read up on "balancing the load", that's the answer I was looking for. Can you elaborate some more on that principle. Say I use a 220 Y splitter and only use one side. Is the generator still balanced if I do this? I'm leery of puling 20 Amps off of one side, Thanks
What you want to do for efficiency (and the lowest billing) is to put the same load on either side of the transformer feeding your home or on your generator. That is one reason why my heavy loads (my air conditioner, welder, table saw, etc.) are wired for 240 V operation. My two 120 V sump pumps are each wired to the opposite side of the power feed so that if both turn on, the load is balanced.