AGM batteries, overcharging on long drives
I am new to AGM batteries and have done a lot of study prior to purchasing them as a replacement for my coach batteries. My charger has a specific algorithm for charging them when plugged into shore p...
Forum Discussion
loving retirement wrote:
I have 4 deep cycle lead/acid batteries in my 2002 Chevy 190 RT and have had zero problems in the last 4+ years and I bet I will get another 3 or 4 years from them. Using a 3 stage charger with almost no loss of water, no boil over or gassing. I don't believe that this overcharging became an issue until the isolator was replaced by the battery separator and they started using AGMs. The loss of that 0.7 volt drop across the diode in the isolator resulted in an additional 0.7 volts being delivered to the house batteries when they use a separator and lead/acid can handle the additional volt better than AGMs.
You are exactly correct. If you have an isolator, there is really no issue with overcharging while driving, but you do lose the ability to charge the starting battery on shore power, unless you put in a bypass.
