NCblueridge
New Member
- Joined
- Jul 31, 2020
- Messages
- 154
Hi everyone. I've posted a few times regarding a battery pack I am building and also have a build thread here:
The batteries I am using are 105 Ah Shenzhen Luyuan 3.2 Volt packs in a 4s configuration. Some may be familiar with these since Will did a battery build with them a while back. I sourced the batteries from Power BLS on aliexpress and they were sent from the US distribution center with free shipping.
However, when I received these batterys they weren't even close in terms of voltage, here are the initial numbers:
3.298
3.288
3.248
3.184
None of the numbers on the label were close either so this appears to just be some bin batteries packed into a box and sent. I sent these numbers to the vendor and she said they don't top balance them before shipping.
So I did a top balance and they were closer but still some variance. Then I hooked them up in series using an overkill BMS (which I like very much). I then hooked up a small inverter and did a run down on the batteries to @22%. At that point, the cell voltages were pretty close (see image).
I then hooked up a Victron 12V/17A charger and began charging, The balance cells when charging feature was enabled on the BMS and it began charging. I let this continue for a few hours but when I checked back on things, charging had been stopped and I had (2) cell overprotection alerts, it looks like cell 1 went rogue or something for lack of a better term..(see image)
So now charging has stopped at 13.84v because of this individual cell. In my opinion this is a bad cell and needs to go back to the distributor for replacement. Would you folks agree?
Any comments greatly appreciated.
My lightweight portable power station build
I am building a small portable power station that will be used as a power source for my kayak's trolling motor and fish finder as well as a small backup system for power outages. For my kayak uses, this will plug into a single outlet on my Slayer Propel 10 kayak and suppy power for a 12 volt...
diysolarforum.com
The batteries I am using are 105 Ah Shenzhen Luyuan 3.2 Volt packs in a 4s configuration. Some may be familiar with these since Will did a battery build with them a while back. I sourced the batteries from Power BLS on aliexpress and they were sent from the US distribution center with free shipping.
However, when I received these batterys they weren't even close in terms of voltage, here are the initial numbers:
3.298
3.288
3.248
3.184
None of the numbers on the label were close either so this appears to just be some bin batteries packed into a box and sent. I sent these numbers to the vendor and she said they don't top balance them before shipping.
So I did a top balance and they were closer but still some variance. Then I hooked them up in series using an overkill BMS (which I like very much). I then hooked up a small inverter and did a run down on the batteries to @22%. At that point, the cell voltages were pretty close (see image).
I then hooked up a Victron 12V/17A charger and began charging, The balance cells when charging feature was enabled on the BMS and it began charging. I let this continue for a few hours but when I checked back on things, charging had been stopped and I had (2) cell overprotection alerts, it looks like cell 1 went rogue or something for lack of a better term..(see image)
So now charging has stopped at 13.84v because of this individual cell. In my opinion this is a bad cell and needs to go back to the distributor for replacement. Would you folks agree?
Any comments greatly appreciated.