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I’ve been using 4 of these in parallel for a bus conversion. Purchased 01/06/26 they have been active on the bus since feb/16.
Last I checked (today 10/21/26) they still have a capacity of 104.75-105Ah each. The system has been reset before but currently my Victron shunt claims “12 full cycles, 43 synchronizations”, and nearly a Megawatthour of use.
I have been very happy with their performance outside of one blip that I may or may not have overestimated. After a full(ish) charge, two of them seemed to not be discharging but, instead, showed “normal” status. I pressed the reset button on them and it went back to discharging. I think, however, it was something that would have corrected shortly and didn’t actually need my attention.
Purchased from SOK Europe via Paypal in June 2022. At the time, not cheap at Euro 2320 delivered. Victron 100 | 50 MPPT solar controller. After 12 months I noticed I was seeing different AH ratings for the two batteries on the SOK App. Emailed SOK and they said to cycle them down and then recharge a few times to reset the BMS, also sent me the password for the app for extra functionality. I did as advised a few times but the batteries never really came back to the same way as when they were new. Bear in mind we get a huge amount of sunlight here in Southern Spain / Gibraltar area so capacity was never really a major issue but the batteries were never stellar in terms of amps. Fast forward to last month, I left the motorhome in the indoor parking as I always do, shut off the battery isolation switch which completely isolates the two batteries from everything but this time it was parked for a couple of months, charge state was approximately 15% and I ended getting side tracked with other work and left the motorhome for longer than normal inside so the cells dropped down to nothing (see attached screen shot of measured cells from one of the packs). I measured the individual cells to below 1V so that's the end of those I think. Yes, I suppose "my fault" for not shutting off the bluetooth however I was never aware the bluetooth would keep running regardless of the charge state and no paperwork was ever supplied in the boxes from new. The design of the BMS should cut off the bluetooth so in my humble view not a great BMS or architectural design.The BMS is supposed to protect the batteries but it didn't. If the power goes too low to the point where you're not going to use the batteries anyway, you certainly don't need the bluetooth to keep going until the charge current is re-applied. Physical build quality is great but the fact I now have 2,320 Euros worth of steel box paperweights lying around and a motorhome without batteries has left me with a bad taste in my mouth to be honest. One small design flaw has destroyed what have otherwise been decent batteries.
A great battery with some very minor software issues
Four of these are installed in our RV in parallel for 600ah of capacity. They have worked nearly flawlessly over the past summer. The only issue so far is the batteries are reporting their total capacity via the Victron CAN interface incorrectly - there is 600ah total, and they are reporting as 388ah total, leaving the remaining percentage estimate incorrect.
Build quality is top notch, and setup was extremely easy. The iPhone app is also pretty good compared to most. All needed communication cables were included as well as retaining hardware.
I’ve been very impressed with the 2 SOK batteries I own. I am using an all Victron system in conjunction with the SOK batteries. The Bluetooth connectivity has been flawless. At one point one of the batteries had a pretty significant cell imbalance issue. I am not certain what caused this but suspect many days of usage while never achieving 100% charge from my small solar array. When I was able to stay in a marina long enough to allow the Victron inverter charger to stay on shore power, the batteries did balance themselves. No intervention needed from me. I’m so impressed with them, I will purchase four more for a new sailboat I am buying. I will replace the current Relion RB 300 batteries as it’s less expensive to buy 4 SOK batteries rather than expand the current bank by adding to RELION batteries. The SOK app is full of detailed informion and it just works is the best way to describe it.
I own 8 of these batteries that are setup in a 2s4p configuration for a grand total of 824AH at 24v. They have been in service almost 3 years now and they have performed flawlessly. We spend a months on end off grid and power isa something we never worry about. Love the metal case and serviceability of these batteries. The only thing I think could be improved is the bluetooth app for battery status. It works but its kinda clunky.