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Old 05-18-2019, 10:42 AM   #1
mncruiser
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City: Minneapolis
Country: United States
Vessel Name: NoFunAllowed
Vessel Model: Monterey 302 Cruiser (2006)
Join Date: Aug 2017
Posts: 40
AGM batteries and charger mode question

Greetings all!

I just purchased 3 new AGM batteries to replace FLA ones. I've got a Xantrex TC4012 charger. I've put the charger in AGM mode. My charger also has two different charging modes:

1. Three-Stage (Bulk, Absorption and Float)
2. Two-Stage (Bulk and Absorption)

I seem to remember reading somewhere that AGM's can be over-charged, but the interwebs shows conflicting information, and Nigel's boat bible is at the marina in the boat.

Any reason to put the charger in two-stage?

Also, my engines are 2005 Mercruiser 5.0MPI's. Should I be looking into alternator regulators...as in are the ones on the engines intelligent enough to charge AGM's responsibly? Or do I need to look into something like an ACR or some other device?

Thanks for your comments!
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