AGM vs Flooded Bulk Times
PT keeps asking whether AGMs will spend more time in Bulk at the same charging rate. I found a good example where that can be measured, using ah64id's test with his PD4655 on his pair of Lifeline...
Forum Discussion
Under a certain and common condition, there is another reason to use AGM batteries that is only indirectly related to some of the discussion above.
If you are using a charger or converter to charge your battery(ies) while at the same time powering other 12V loads in the RV, the maximum current available from the charger or converter (no matter how high that maximum is) will be allocated between the various turned-on loads based on the internal resistance of each of the loads in accordance with well known equations that define electrical relationships. Since AGM batteries have low internal resistance, they may often get more of whatever current is available - over what higher resistance wet cell RV batteries would - from the charger or converter because 12V loads in the RV with lower internal resistances will hog more of the current.
That's one of main reasons I use AGM batteries - so that they get more of the available current from our converter than wet batteries would when at the same time charging the batteries while using other 12V equipment ... whether that be when camping and using only solar, or solar plus a generator, or when on hookups.
My situation is not one of trying to absolutely minimize recharge time using specific equipment designed to do that, but one of trying to reduce battery charging time through use of AGM batteries along with the other stock equipment that came with the rig. IMHO, this could be a simple approach for others who don't - for various reasons - want to make more changes or add more equipment beyond stock.
If you are using a charger or converter to charge your battery(ies) while at the same time powering other 12V loads in the RV, the maximum current available from the charger or converter (no matter how high that maximum is) will be allocated between the various turned-on loads based on the internal resistance of each of the loads in accordance with well known equations that define electrical relationships. Since AGM batteries have low internal resistance, they may often get more of whatever current is available - over what higher resistance wet cell RV batteries would - from the charger or converter because 12V loads in the RV with lower internal resistances will hog more of the current.
That's one of main reasons I use AGM batteries - so that they get more of the available current from our converter than wet batteries would when at the same time charging the batteries while using other 12V equipment ... whether that be when camping and using only solar, or solar plus a generator, or when on hookups.
My situation is not one of trying to absolutely minimize recharge time using specific equipment designed to do that, but one of trying to reduce battery charging time through use of AGM batteries along with the other stock equipment that came with the rig. IMHO, this could be a simple approach for others who don't - for various reasons - want to make more changes or add more equipment beyond stock.
