Re: Charge batteries from charger and solar at once
I'd advise against expanding your battery bank without some significant increase in charge capacity. The reason being that at 15 Amps max you're at about 7% charge rate of the existing bank. Unless your usage is low and you spend a lot of time in 'float' daily, you really don't have much capacity for charging and handling loads as is.
You could use the Iota for bulk charging and then 'finish off' with the solar, but it would be a real pain in the anatomy to do so every day.
BTW, you don't equalize AGM's unless the manufacturer specifically says so. Just leave them be and use a battery monitor if you have one.
Four 175 Watt panels, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps