Homebrewed Electricity > Storage
Discover 2v 920ah opinions
bigrockcandymountain:
I have a chance to pick up a 48v bank of 2v 920ah Discover OPzS batteries second hand. They are about 6 years old, and were in a cabin, so likely not cycled as often as a primary residence.
Being replaced as part of a remodel / expansion.
What do you guys think? What are they worth?
SparWeb:
45kWhr is going to be quite a load of lead to haul!
Maybe obvious: Check for swelling or signs of freezing if they were left discharged over winter.
Here's a set of Rolls batteries on Kijiji for comparison (about 1/2 the capacity of that giant Discover bank):
https://www.kijiji.ca/v-renovation-electrical/muskoka/rolls-deep-cycle-solar-batteries/1675480638
bigrockcandymountain:
Well, I'm not sure it was a good idea, but here we go. They were sitting for most of a year, and are all still showing 60% to 70% state of charge. The tops looked quite corroded, but other than that they seem fine.
If I get 6 years, for what I paid, I think I'm even with buying new rolls s550 They are 5 years old and a 20 year design life battery, so I'm hoping for more like 10 to 15 years out of them.
I'm also in the process of adding 2.4kw solar, for a total of 5.4kw. By the end of the week, we should be looking a lot better for power.
Now to haul them into the basement. I have lots of beer. Anybody? 😁
DamonHD:
I'll drink beer to your new storage lifetime!
Rgds
Damon
bigrockcandymountain:
Batteries are in and mostly hooked up. I'll finish and hook up power today. They sure look big beside the old L16 bank. (Red)
They were overfilled with water when i got them. All the SG were pretty even, so I drained 2 cups exactly out of each cell. Ill add it back in when the levels drop.
Discover doesn't exactly list an absorb voltage for these. The feeling i get is they run lower voltages than L16. I'll start with 57.6v absorb and check gravity to get the target of 1.240
I'll be closing in a battery box over them right away and ventilating it to outside. They list 2.5kwh at 120h for capacity. That means 60kwh storage. This seems like way overkill but hey, hopefully i got lucky.
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