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Do you think 3 Odyssey 31M-PC2150 100 Ah (nominal 20h d/c) batteries in parallel (which i desire mostly for their cycles at 80% DOD rather than their current acceptance) would be well matched to a 60 A alternator or do you think it would seriously reduce the alternator lifespan?
 

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you should be fine as long as the alt has good cooling. the standard number is 25 % of your bank, which would be 75 amps. if you run you batteries down to 50 % or 150 amps, it would take 2.5 hours to fully recharge if it was a perfect system. but do to reasons of the way batteries charge it might take 5 hours to fully charge. figure in 2 hours you could put in about a 100 amps ( if alt cooling up to par ) which is close to the real normal range of 70 to 80 %.

so yes it should be okay if you have good alt cooling, maybe even a vent tube going to the alt
 

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ScottyT—

The Odyssey batteries are AGM batteries using TPPL technology IIRC. They have a very, very high current acceptance rate...and three 100 AH ones could probably be charged at 200 amps to begin with and be perfectly fine. The 25% rule does not apply to them.
 
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