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Old 12-09-2008
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Traditional wisdom for wet-cell batteries is not to charge at more than 20% of the battery bank capacity as a maximum charging rate. You can charge at a higher rate and get away with it...but it generally isn't too good for the batteries. AGM batteries have a much higher current acceptance rate and can often be charged at closer to 50% or so of battery bank capacity.

Some of the newer technology batteries can be charged at even higher rates.
Quote:
Originally Posted by Omatako View Post
So based on this, 4 Trojans would be 450 amp hours so the charger should not exceed 90 amps? That's a worry.

I have only four T-105's in my house bank. I also have a Freedom 25 charger. I also have a 185 amp alt on my main engine which routinely pumps 140 amps into the house bank when it's a little soft. I can't say I've ever had an overcharge situation because of this. I monitor the whole lot via a Link 20. My batteries aren't gassing and I'm not losing a lot of water.

Most cars have a 65Ah battery driven by a 55 amp alternator. That's quite a bit more than 20%. Most are wet cells.

I always thought that the regulator decided what amperage was delivered to the batteries. Not the charger.

Am I wrong? Again?
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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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