Darkstar
Rain Wrangler
- Joined
- Dec 31, 2019
- Messages
- 339
How did you "balance charge" your 2 BYD's and get all your cells up to 3.6 v without one or more going overvoltage in this knee area? and why are yours staying at VPC of 3.6 when most of the rest of us are reporting an quick drop out of the knee area back down to 3.31 - 3.34 stable VPC as soon as we stop charging?
A couple or three cells in each pack drop by a few hundredths when charging is stopped. If all stayed at 3.6 then overall voltage would be 28.8. Mine are dropping a volt or so from that level when charging is removed.
I am using ISDT T8 and Q8 balance chargers with a DC power supply. They bring the cells up individually to 3.6v and then hold them there until the others are brought up to the same level.
I got my packs from battery clearing house. They stated that the packs were from a decommissioned solar power station and were less abused than the west coast packs. Not sure if that is BS yet or not but all my packs arrived at between 25.3V and 25.9V. They could have charged them prior to shipment but they told me that was the storage voltage and they needed to be balance charged before being put into service.
Here is my thread on balance charging with ISDT chargers:
Balance charging 14 BYD packs with ISDT Hobby Chargers
Follow along as I try to bring a bunch of BYD packs up to snuff after being in storage for a while. These packs were purchased from Battery Clearance Warehouse and seem to be in pretty good shape. The lowest initial voltage reading on any of the packs I got was 25.3, highest was 25.9...
diysolarforum.com
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