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That sounds like a better plan. I was in your shoes not that long ago. After much research we ended up with a single dedicated starting battery as one bank and six Trojan T-105 batteries as our house bank. The T-105's are 6 volt golf cart batteries but wires to produce a single 12 volt 675 amp hour bank. The cost of all the T-105's was around $750 but that was up here in Canada before our dollar was worth more than the american dollar so I would assume they are cheaper than that now above or below the boarder. Compare other options amp hour for amp hour and see if you can find a cheaper option. The trojans also have a good reputation for being of good quality. If people try to talk you out of it based on weight ignore them. The amount of lead in a battery has a direct correlation to the amount of power it stores. Heavy is good in other words. And my advice when saildog tries to talk you into AGM's is that he is right, if you can afford them. For us AGM's where not worth the cost.
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