How many A/hr for a STARTING battery bank? Are there guidelines for a battery size to the starters amp pull ratio? Engine is a cat 3208 24v. A pair of 8Ds was recommended by boat yard. I called cat and they said a pair of 4Ds is common for marine use, but a couple group 31s should do it. Huge differences here in battery size recommends. For each pair of batteries:<br /><br />8D = 200A/hr - 1375 mca - 290lbs - $1100.00<br />4D = 140A/hr - 1150 mca 215lbs - $780.00<br />31 = 115A/hr - 750 mca 106lbs - $440.00<br /><br />One thought was a smaller starting bat (size 31) with a manual connect switch to bridge with the house system, if ever needed. House system is:<br /><br />8L16 = 370A/hr 1900 mca<br /><br />A battery designed for starting is preferred over a duel-use or other deep-cycle battery. Suggestions? Tips? Thanks! -joe
