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Old 02-11-2009
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I'd be inclined to combine all the Trojan wet cells into the house bank and buy a 27 wetcell for starting, connected thru the Echocharger. Two reasons for this choice. If you use an AGM, as was stated before the optimum charging voltage is lower than that of thr Trojan wet cells, so the echocharger will possibly cook the start battery. The wet cell will give you the most bang for the buck, but have a shorter life expectancy than a properly charged AGM. Therefore you will not feel so bad about scrapping it at the time the trojans need replacement, and you want to go with all batteries of the same type and age. The major disadvantages to wet cells are: you can spill acid if the boat is knocked down, and you have to check regularly to see that there is water in all cells. Since you have this problem with the trojans anyway, why worry?
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1980 Endeavour 37 sloop, currently in the Mississippi near St Louis
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