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Hi Mike
Make sure you get the correct charger for AGM batteries.
My observatory batteries are lead acid iand I charge them at no more than 10% of battery capacity which is 500 amps therefore 50 amps however I prefer less. The house batteries are AGM and I recall they required a different charger and a lower charging rate...I can't look now to say if the charger is wired direct to the batteries or goes thru a regulator but I expect direct..but maybe not..I must check rather than guess.
However running the charger when the Sun is out happens often and so we don't regard doing so a problem..the main thing is to get the correct charger and not to exceed a certain charging rate..when we replaced the lead acid batteries with AGM we got another "special" charger and I took the old charger for the observatory.
I haven't done so but you don't need a large genny..I have a key start Honda 3 kva but I expect I could have got away with a 750 watt little Kipor ...guessing I would say you may find for your batteries the charge rate will probably be around 25 amps so a little Kipor would do I expect..
I can ask my "assistant" who is an electrical engineer and very knowlagable in all things solar..he recently gave lecture in town on solar and I think worked on the development of Solar Panels...he recomended and installed the charger for tbe AGM Batteries in the house now that I think about it.
I expect the charger in the house would be what you would need..anyways more tomorrow.
Alex
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