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Old 04-08-2010
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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
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Last edited by sailingdog; 04-08-2010 at 11:23 PM.
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