Not sure if I would recommend doing that very long though. I like the fact that it has its own Bluetooth BMS. Wish SOK offered that.I would ask for replacement with a matching set…
or a refund and get the AO batteries Will tested recently with 200a draw capability!
If you’re referring to pulling 200amps for an extended time or regularly, I agree.Not sure if I would recommend doing that very long though. I like the fact that it has its own Bluetooth BMS. Wish SOK offered that.
See:Just got on the SOK Battery website. Apparently they now offer a BMS as well as batteries with bluetooth capability. Does anyone have any video or reviews of this?
SOK BMS for 12V LiFePO4 Battery DIY | SOK Battery
SOK 4S BMS for LiFePO4 Battery DIY.Low Temperature Cut-off Function.High Temperature Cut-off Function.Bluetooth Function. High charge/discharge current shut off function.www.us.sokbattery.com
Thank you. I searched but didn't see that thread. I will be interested to see someone show the BT functionality and ability to edit parameters on a video in the future and do a comparison with other BMS's. Maybe @Will Prowse would like to do a little review?See:
New SOK Bluetooth BMS for DIY
Looks like SOK finally has a Bluetooth version of their BMS and are selling separately as a DIY piece. Seems they have up its rating slightly to 70 amp charge / 120 amp discharge, but if its like their current BMS which looks identical its actually 150 / 150 continuous...diysolarforum.com
Looks like Will has a new video showing the changes to this newer style battery. You are correct, they changed from using wires to connect to the battery terminals to using solid copper bars. This gives the battery a much better connection and allows for more current to pass thru at a higher rate of charge/discharge. A much better design for sure but also a little more difficult to disassemble. It does not look like it’s difficult to do at all but certainly is not as easy as the prior configuration. The trick is to be very careful of a short but I feel this is still very user friendly and I am in no way unsatisfied with this new design.any help at all?
I actually have one of each of the different sizes and revisions as you do. One is a month old and the other is maybe 8 months old now with maybe 15 charge cycles on it. I’m using them in a 12V configuration though. All I did is charge each one separately and then combined them together. I’ve had a couple charges on them now that they are combined and they are working perfectly and in harmony. Not sure what difference combining them in series would be but I would imagine a top charge on each would be just fine. I too would have rather had the same size batteries whether they be old style or new but I’m not seeing any incompatibilities so other then esthetics it’s not really too concerning.Thx for the reply. Will didn't show the entire disassembly, but enough to know that I was correct in my assumption that I'd need to disconnect each lead....and yea....I'm worried about shorting something out.. I like explosions....as long as they are on purpose and far away!
More concerning though is his statement that these new batteries should not be put in series...the two new 12v that I purchased are for a 24v system, so I'm going to have to contact SOK and see if they even offer the older batteries anymore.
As for my thoughts on the design....I'm too new to this to really have an opinion other than the entire reason that I went with SOK was the user serviceability of these batteries and being able to swap out single cells as necessary.
On another note, I don't currently have any of the various tools that Will uses to charge/discharge etc. Do I need to get something that will allow me to balance charge these up prior to first usage?
Thx again!
The problem with putting BMS's in series. Is that they will never stay equal with each other. Each BMS will balance their own cells, independently. Which will throw them out of balance with each other.Not sure what difference combining them in series would be but I would imagine a top charge on each would be just fine.
Not sure why you would say this since even a single 12V 100Ah LiFePO4 has 4 single cells in series. What’s the difference in connecting 8 single cells or two 4 cell banks in series when the manufacturer says it’s fine and warrants their product for that kind of configuration?In my opinion. Putting batteries in series is a lead acid thing. With lithium, you should buy the proper battery.
Explained aboveNot sure why you would say this since even a single 12V 100Ah LiFePO4 has 4 single cells in series. What’s the difference in connecting 8 single cells or two 4 cell banks in series when the manufacturer says it’s fine and warrants their product for that kind of configuration?
I can see your point but I’m not sure it’s really a serious issue in the hundreds if not thousands of real life applications out there. Again, I have my system in parallel and retaining the 12v configuration so maybe it’s just something I haven’t looked into but each BMS is different and I haven’t seen anyone complain yet about this happening with the SOK BMS.The problem with putting BMS's in series. Is that they will never stay equal with each other. Each BMS will balance their own cells, independently. Which will throw them out of balance with each other.