โNov-15-2018 09:43 AM
โNov-22-2018 04:30 AM
โNov-21-2018 10:08 PM
โNov-21-2018 07:12 PM
BFL13 wrote:You just kill me. ๐
Are you sure you belong on the internet? Far too polite! ๐
โNov-21-2018 05:03 PM
ron.dittmer wrote:
Interesting comments BFL13 and pnichols. Though I highly doubt it, I cannot prove that my charging method did not contribute to my two pairs of 12V lead acid battery troubles. Does innocent until proven guilty apply here? Ha ha.
One thing we seem to agree on.........AGMs are worth the extra expense, whether two-12V/parallel or two-6V/series. They seem to take abuse much better.
โNov-21-2018 11:08 AM
โNov-21-2018 09:53 AM
ron.dittmer wrote:
I should have made it clear in my reply that when one 12v battery slips in performance, my smart charger kept trying to get the pair to a full charge but could not. My smart charger would not give up and shut off.
The weak battery pulled down the pair, over charging the good one causing boil overs to both.
On my work bench with batteries separated, my smart charger completed the charge to the good battery and stopped. The ill battery would not accept a full charge, causing the charger to keep trying. So when they are back in the motor home together, it is an ill situation.
While on a trip, I would have been better off identifying the weak battery and take it off line and do the trip with just one battery.
The ill situation happened to two sets of 12v batteries, a repeatable condition that has me issuing my warning working with pairs of 12v batteries. If you replace your 12v batteries every other year, you avoid such problems.
โNov-21-2018 08:25 AM
โNov-21-2018 07:54 AM
โNov-21-2018 06:26 AM
โNov-21-2018 05:49 AM
โNov-21-2018 01:52 AM
pnichols wrote:I would have not believed it myself so I understand why you both posted your comments.BFL13 wrote:BF - good point.ron.dittmer wrote:To clarify the report, were those two 12v batteries "balanced" as in the loads and charging were "across" the two, or were the loads and charging on one of them with the second battery "downstream"?
My personal experience with motor home batteries......
Two smaller 12V batteries will not perform better over time compared to one larger battery. They will when new, but year number 2 will have noticeable degradation. Year number 3, they will be working against each other. Indication of battery mismatch will show up as acid boil-overs.
I do feel that two 6V batteries of a smaller size will perform better than a single 12V battery of a larger size.
I don't see how a couple of 12 volt batteries connected in balanced parallel can ever have one working against the other. After all, with two in balanced parallel what it seems that you really have, electrically, is six (6) double plate size 2 volt cells stacked in series to produce 12 volts - of greater current capability than only one 12 volt battery with it's hence smaller plate size 2 volt cells stacked in series.
Two 12 volt batteries connected in unbalanced parallel is another situation altogether, since when supplying or receiving current the two 12 volt batteries do not have the same potential across their plus and minus terminals. Over time this will cause different age-related plate and/or electrolyte degradation between the two 12 volt batteries.
โNov-20-2018 06:02 PM
BFL13 wrote:ron.dittmer wrote:
My personal experience with motor home batteries......
Two smaller 12V batteries will not perform better over time compared to one larger battery. They will when new, but year number 2 will have noticeable degradation. Year number 3, they will be working against each other. Indication of battery mismatch will show up as acid boil-overs.
I do feel that two 6V batteries of a smaller size will perform better than a single 12V battery of a larger size.
To clarify the report, were those two 12v batteries "balanced" as in the loads and charging were "across" the two, or were the loads and charging on one of them with the second battery "downstream"?
โNov-20-2018 03:19 PM
ron.dittmer wrote:
My personal experience with motor home batteries......
Two smaller 12V batteries will not perform better over time compared to one larger battery. They will when new, but year number 2 will have noticeable degradation. Year number 3, they will be working against each other. Indication of battery mismatch will show up as acid boil-overs.
I do feel that two 6V batteries of a smaller size will perform better than a single 12V battery of a larger size.
โNov-20-2018 03:03 PM