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Hugo

Your soon to be bank of group 31 batteries won't accept much current. If flooded only 40 or 45 amps. Even if they are Agm's they will only accept more current for a short while. Engine charging without going anywhere is terribly inefficient anyway. To improve measurably - upgrade the alt to a new one - say $200 to $600 and a good external reg - say Balmar MC-614 @ around $400 you have spent a lot of money for those times when motoring and to charge what is a pretty small battery bank. Now if you were cruising extensively and had a battery bank of 4 to 6 golf carts for a bank size of 440 to 660 AH it would be more worthwhile.

I agree with Bill - more solar with a good MPPT controller will return more for less outlay.
 
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