Powermax 75 amp converter/charger
I am charging a pair of Trojan T-105 batteries, they were drawn down to 12.38 or 6.19 per battery which should be about a 30 percent discharge. The powermax is only putting out about 13 amps @ 14.68 v...
Forum Discussion
BFL13 wrote:OK and within a few minutes the OP is down to 13 AMPS into the FLOODED batteries. 75 might shave a few seconds.time2roll wrote:
13 amps is fine if you have 14.68 volts. This is why I recommend a smaller PowerMax with just two batteries. 35 amp would be fine.
That's if you don't mind another hour of gen time to do a 50-90 per my ugly graph above. And if the campground gen hours let you. Of course on shore power you don't care about the time it takes.
Then there is the dreaded 20% charging rate in Bulk for AGMs so a 35 amper being 20% means the bank is 175AH or less. The OP does not have AGMs though.
I did find that low and slow was how to recharge Marine/RV batts to true full, which don't like a high charging rate. But you have to maintain the low amps and keep charging till they reach 16v. Now the hydrometer says you are there and can drop to float. No wonder people have poor luck with those things using a 14.4v converter :(
Yes a battery with lower internal resistance such as AGM or Lithium will charge at a higher rate and charge faster on the 75 amp converter. Trying to relate to the OP's situation.
From above:
S Davis wrote:
The initial readings are within a min or two of hooking up the charger so I thought at 30% discharge the batteries would be accepting more amps.
