Where are you finding 6 volt batteries with an amp-hour capacity of 450 amp-hours each? Amps in series DO NOT add. So a 232 amp-hour six volt battery in series with another 232 amp-hour six volt battery equals a 12 volt battery with 232 amp-hours.
I haven't given up on the solar. It seems 6V batteries have more ah than 12V batteries. I can get by with two for a total of 450-460 ah. That's more than enough for my needs.
Ha...I didn't know that. I'm pretty green. Do the amps for two 12V add up? I assume so. Four 6v would double up too, right? (12v system)