Test Results-Used T-1275s
(Test Results in a later post in thread page 2) What does the peanut gallery think is the proper SG on a well-used battery? I can never figure out if it is 1.275 but on a reduced capacity, or if ...
Forum Discussion
I am running the load test anyway, but I am not happy about the supposed "full" I am using. The SG could have stopped rising at 1.255 because charging was slowing down with solar at the end of the day or because that's as high as it will go, I could not tell.
They could be still stratified with the higher SG stuff still below hydrometer reach. The solar controller's two hour limit on Absorption at 14.6 then drop to Float limits stirring. Also T-1275s are a tall battery if that matters.
The engineer ref above says to get SG you first have to give the batts a good equalize stir, then leave them on Float for 72 hrs!
I did see 1.275 when I first charged them up after they had been "resting" for two months or so, but got tons of black stuff in the hydrometer--nasty looking. They were already showing 1.250 after a I got them to the trailer after they had been "agitated" some in the back of the truck on the drive back from the golf car place. I did not get a reading while they were still on the pallet there.
However, I don't want to equalize them like it says, or I will get that black stuff big time. Problems, problems. The way SG shoots up right at the end of the recharge does seem to mean that there isn't many AH during that time though, so if I missed the part from 1.255 to 1.275 that would not be much in the over-all capacity picture.
Best I can do now is get the est capacity from this load test and say that they are "at least that much" They do act like good batteries in use. I can't tell any diff operating from when I have my regular bank of four batts hooked up. That includes inverter loads for MW, kettle, and toaster with 90-110a draws doing that.
If these T-1275s are like this when beat-up, then new ones must be very nice indeed.
They could be still stratified with the higher SG stuff still below hydrometer reach. The solar controller's two hour limit on Absorption at 14.6 then drop to Float limits stirring. Also T-1275s are a tall battery if that matters.
The engineer ref above says to get SG you first have to give the batts a good equalize stir, then leave them on Float for 72 hrs!
I did see 1.275 when I first charged them up after they had been "resting" for two months or so, but got tons of black stuff in the hydrometer--nasty looking. They were already showing 1.250 after a I got them to the trailer after they had been "agitated" some in the back of the truck on the drive back from the golf car place. I did not get a reading while they were still on the pallet there.
However, I don't want to equalize them like it says, or I will get that black stuff big time. Problems, problems. The way SG shoots up right at the end of the recharge does seem to mean that there isn't many AH during that time though, so if I missed the part from 1.255 to 1.275 that would not be much in the over-all capacity picture.
Best I can do now is get the est capacity from this load test and say that they are "at least that much" They do act like good batteries in use. I can't tell any diff operating from when I have my regular bank of four batts hooked up. That includes inverter loads for MW, kettle, and toaster with 90-110a draws doing that.
If these T-1275s are like this when beat-up, then new ones must be very nice indeed.
