Steve, I'm no battery wizard, only experienced. 4 years ago I purchased a batteryminder 12248 and a Battery conductivity tester. About $350 investment. I have 20 batteries. The only battery that die in that 4 year period is the dump trailer battery.
The time it takes for the batteryminder to go through it's different stages, charging, desufating and then to the trickle stage tells me just how healthy the battery is. Most of my batteries get a batteryminder treatment about every 30 days. The really healthy batteries take less than 24 hours for charger to complete it different modes.
I left the tractor battery connected to the 3 batteries in dump trailer. I used dump trailer yesterday. Then I charged all 4 batteries at the same time. The charging cycle was completed in under 24 hours. All batteries test healthy. The manufacture of charger says it can to be used on 3 batteries at the same time in an RV.
No one has said how much current the pump uses. I have no way to measure it either. No info on pump. So, if you look at the marine battery on the right, the wires may be confusing. Look for a red and black wire that are the same gauge attached to the battery. They go to the pump. I'm guessing it a #6 or 8 copper. If it's a #6, there is a good chance the pump uses around 60 amps give or take.
If all 4 batteries share the load, then each battery is supplying 15. That would help explain why the ammeter on the tractor is close to 15 amps when dumping.
So, all the batteries I'm using are paid for and are spare batteries that were just sitting on the work bench. After learning not all marine batteries are the same, I think I'll continue to use what I have. I may put foam cushion under them. If I ever need new battery, I will get the biggest truck battery on the market.
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