Basically, battery chargers should be sized according to the size and type of the batteries they're going to be used with.
Wet cell batteries should be used with a charger that has an amperage rating equal to about 20-25% of the bank size in amp-hours at the 20 hour rate. Ex: Two T-105s make up a 225 Amp-hour battery bank, and the charger should be about 45-55 amps in capacity.
AGM batteries have a higher acceptance rate, and can be used with chargers rated at up to about 50% of the bank's amp-hour capacity in amps.
At a minimum, the smallest battery charger you should use should be rated at about 10% of the battery bank's size in amp-hours @ the 20-hour rate. Ex: the two T-105 battery bank should have a 20 amp charger at a minimum.
The Guest Pro 2608 you have is a 6-amp charger, and is pretty undersized, especially if you consider that the Optima batteries have a pretty high charge acceptance rate, being a form of AGM battery.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Last edited by sailingdog; 04-08-2010 at 10:23 PM.