Join Date: Jul 2006
Location: Corpus Christi, Tx
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Re: Power Battery Set up for 27ft sailboat
When I purchased my 28'er, the PO had two dual start/house batteries, both about 5 years old. The existing charger was the old style single stage charger and quickly cooked the batteries when left on, even overnight. I replaced both batteries with deep cycle group 27s and replaced the charger with a three stage charger wired directly to each battery. I use this set up for engine starting (Atomic Four), tiller pilot, lights, stereo and VHF. I randomly alternate which battery I use but after starting on one, switch to both after the ammmeter settles to less that 30 amps under the rationale that the starting battery needs the rapid high amp recharge and that both need the lower amp top off charge. Two <$100 wet cell group 27 deep cycle batteries will last more than 5 years, if cared for. However, maintenance free sealed AGMs would be a pleasure to have for just a few $s more.
A Guest 10 amp dual battery charger and two group 27 house batteries will cost just over $300 and give you about 100 useable amp hours, which has been more than enough for me.
ps. for sure, your engine will start with a deep cycle house battery, so you don't need a dedicated starting battery.
Last edited by ccriders; 06-09-2013 at 11:35 AM.