Most reacted posts

Honestly, I'm upgrading from 3 x 100Ah AGM batteries. So even 95% full with these LiFePo4 is going to be WAY more usable capacity than what I had before. I just don't want to damage them or impact the longevity. So interpolating everything on this thread, it appears that the Minn Kota charge...

Alright, I've got the inverter/charger and 100Ah 24v LiFePo4 pack sitting in the rack. Its been running for a couple weeks now and its working great! Ended up using the following battery: Of course did a full battery capacity test beforehand - it was a little over 101Ah. I still need to...

So what balance voltage/delta should I say its 'good enough at'? 50mV? 20mV? Or am I expecting too much here?

I'll recharge and set the Victron discharge floor to 0% - to make things a little more comparative. But I notice that even when I put a load on the battery pack....the instantaneous Current draw numbers of the SOK BMS and the Victron are off. The higher the current draw...and the greater the...

It goes back to mains/service power once that returns. Regarding LiFePo4 charge profile...ya, you have to set to custom and tweak the charge profile through the CLI/serial interface. For now...I'm just using the GEL charge profile which keeps the voltages down to 14.4 so I shouldn't have a BMS...

So SOK is telling me not to worry that it will balance itself out. Direct quote: """ I noticed this, this Voltage difference in range, you don't need to worry about this. If you checked the capacity, it over 100Ah already. Also, you could keep using, after using a while, this Voltage different...

Hi Folks. Sorry if this is not in the correct forum category. Wasn't sure which one would be most appropriate; but Powerwalls seemed close :) I'm wanting to replace some UPSs that I have at home. We lose power often; and I have a generator setup that runs on Natural Gas. But its manual. So I...

Marine version of SOK 100Ah is Bluetooth. As far as Shunts on trolling motor installs, its a mix out there. Seems like the hard core fisherman have Shunts because they need to know every detail to make sure their day does not get cut short. Especially the guys in tournaments. Battery...

I haven't asked them directly...other than, they support up to 4 in series...

Thanks for the feedback. I'm open to other batteries for marine electric trolling motor use. I'm just looking for whatever would be reliable. The Chins, Amperetime, etc all have an attractive price point; but reviews seem across the board. Plus, I'd really like to have cold-temp charge cutoff...

24v 100Ah battery was $530 Inverter/charger was $649 60A breaker was $16 from Amazon Rack Shelf (rated weight of 110#) was $46 Plug ends & SO cable from Home Depot ~ $35 A few dollars for the wire and crimp rings/lugs from the local Marine Shop for the DC side. I have a hydraulic crimp, so I...

This is for a marine application. No solar. Onboard charger to charge batteries after use. 36v Trolling motor; so replacing 3 group31 AGMs wired in series for 36v. Because of limited battery locker space, I have to use 3 separate batteries to get them to fit (one at a time to slide into the...

In post #30, I was actually able to get it on the bench and figure it out. I decided to go down the Inverter/Charger path. Its on order. Will report how it goes after I get it on the bench and test it.

Ya, SOK suggested, when I first bought the battery, to do several full discharge/charge cycles so that the BMS could calibrate the SoC correctly. On one of the other batteries in series, I cycled it a complete 5 cycles. Its showing the same thing...

Awesome. Thanks for doing that. So it looks like the basic construction is very similar to their larger 206Ah marine battery. Lugs have no epoxy on them...but just lock washers. Which isn't that big of deal I guess given that you can easily take the battery cover off and service the unit. How...

Thanks everyone for the help and pointers. I think I'm ready to move these from the bench and install now. :)

Celebrated a little too soon. It is better...but not good enough to call it good. After some discharge/charge cycles, its not as good as that first manual balance. Good thing is, the charger (Minn Kota charger) is not erroring out when doing a full charge. The BMS is not cutting out with the...

I was thinking of doing something similar. Having a schematic would help isolate what to clip (this is assuming there is no dip switch or anything to actually disable it). Here is a pic of the control/inverter board on one of the Cyberpower UPSs. Would love to know if someone has already...

Interesting. I haven't read the ABYC E-13 standards, just various boating articles on this. Seemed like everything was focused around Lithium Ion because of concerns of potential thermal runaway.

So, this is the OCV after 24hours with no load (other than the micro load of the Victron SmartBMS inline). Everything else is completely disconnected for 24hours. So that is indeed the resting voltage. This begs the question: Why is the SOK BMS so far off? When I did a resistive load test...

I'll reach out to SOK and ask them. Interestingly, when I look at Minn Kota's data sheet for the charger I have...it says it supports LiFePO4 batteries. From their datasheet: """Supported Battery Types: 12v AGM, 12v Flooded Lead Acid, 12v Lithium LiFePO4"""

For dropping a cell down by, lets say, 100mV, how long do you put your lamp on the cell? Just so I have a ball park idea? And you do this after you tripped the BMS on overcharge correct? Or is this during charge?

Any suggestions on an inverter that would be good for this application? A pass through inverter might be an option...but wondering which models would get me to a switch over time that is fast enough for PC equipment? UPS's seem to be in the 6-12ms switch over time (APC specs); but at least the...

Hi Folks, I know there were some threads in the past on this I've read through. The ones I read didn't seem definitive on this and they were a while back; so I thought I'd post since I'm at a cross roads. I have 3 - SOK Marine grade 100Ah LiFePo4 batteries that are wired in series for 36v...

With the MultiPlus if I want to interface it with a Raspberry PI (which is what I use for my existing UPSs to run scripts on loss of power), do I just need the USB VE.Direct interface and that will suffice? Or any additional items? -J

I did a full discharge and recharge, this time with my Minn Kota charger that is 15Amps @ 14.2volts. This time it charged without BMS cutoff and it finished the charge without flashing red at me. So that is a good thing. As far as re-converging sufficiently; that cell 3 is still hitting peak...

I'm going to give the Cotek inverter/charger a shot. Just got off the phone with them. Looks like it will work just fine. the RJ12 has RS232 pins and I can easily write an interface with pexpect to do what I need to do. Via the same interface I can configure the charge profile/voltage and it has...

So this is what I mean by confusion. We're back to multiple voltages now. SOK's datasheet says Recommended Charge Voltage is: 14.4V-14.6V https://drive.google.com/file/d/1oy6p4w2kyN4aF1ikAtsG7t8PBuoB8xO9/view When I ask SOK support can I store them fully charged, they say no problem. I'm super...

So, i balanced it by putting a load on cell 3 and have them a little more equal now. But CMOS is still tripping once the cell voltage gets high enough. Makes me wonder if the charger (2Amp Noco) is actually going higher than 14.6 volts.

Thank you for the quick and VERY informative post. I'm good with disconnecting after 24hours; heck I can even plug this into a timed / switched outlet to address that. As far as storage, other than camping, the boat is stored in an insulated garage. So temp might get up to 90degrees in really...