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
I think the explanation by LandYacht abut every 5 days is very close to my observations. For what ever reason every 5 to 7 days of consecutive 95 to 98% state of charge is not enough on an AGM. I say this because being on a 2 week trip, and doing only one as close to 100% full recharge after 7 days ( I was a little lazy on this) then another 7 days of camping caused me to pull the battery when I got home (like I always do) and recharge in the man cave with the MegaWatt with 14.4v and watch the RC charge indicator for voltage and take rate. What I thought would be done and down to 0.75 amp hours by just before lunch time was closer to being finished by the end of a football game at 4pm.
I can only speculate, but from my limited backround, lack of full 100% SOC recharges perhaps somehow increases the internal resistance inside the battery to get to full charge. It's like the sulfur grows adhesive powers if left on the plates too long, and gets more and more hardened and stubborn to remove and get back in to ionic liquid state. Or maybe it's a battery acid circulation problem inside the plates and the solution in the mats surrounding the plates that prevents anything but time to force the sulfur back into solution.
I don't know the why, I just know what I observe. It's no big deal to me at home if it takes 3 hours or 8 hours to get that .75 amp recharge rate. It is a big deal to me when boondocking.
I can only speculate, but from my limited backround, lack of full 100% SOC recharges perhaps somehow increases the internal resistance inside the battery to get to full charge. It's like the sulfur grows adhesive powers if left on the plates too long, and gets more and more hardened and stubborn to remove and get back in to ionic liquid state. Or maybe it's a battery acid circulation problem inside the plates and the solution in the mats surrounding the plates that prevents anything but time to force the sulfur back into solution.
I don't know the why, I just know what I observe. It's no big deal to me at home if it takes 3 hours or 8 hours to get that .75 amp recharge rate. It is a big deal to me when boondocking.
