Re: what model onboard charger to buy
There are several ways to charge your battery: the proper way, the popular way, the easiest way, or the cheapest way. They are not necessarily the same.<br /><br />You have not proved enough information to suggest a charger. Example, if you batteries benefit form a charging source during use, you might be ok with a lower amp charger. If no onboard charging, a high amp output would be more desirable for battery maintenance.<br /><br />Whatever charger you decide on, there is little reason to not get a smart charger, one that senses the charge state of the battery and adjusts the charging amps/voltage to appropriate levels during the whole process. Guest does make these multi-stage, smart charges. In the case of a low amp, 2-bank charger, you can combine the output leads on a single battery and double the bulk charge amps, if needed.
<br /><br />You need a Guest dual bank automatic onboard charger.<br /><br /> http://www.iboats.com/mall/index.cgi?keywords=electrical&cart_id=038346658 <br /><br />Good luck. 
