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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...

@Crowz But..... That is just an inverter. Not an inverter/charger.

That is Exactly how the Cotek INverter/Charger works that I'm using. https://www.donrowe.com/cotek-sc1200-124-pure-sine-inverter-charger-p/sc1200-124.htm I would have considered going with a Victron, but they do NOT make a US version that runs on 24v in the wattage I was looking for. Cotek was...

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...

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...

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.

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...

I think I found something that might work. I'll give them a call in the morning and see if I can chat with them a little more. It looks like it has an RS232 interface that I might be able to write an interface to...

Actually I figured it out. I'm getting 27VDC output from Schottky Rectifier Diode (circled) SS26. By severing the cathode side (pointed towards the battery connection); you cut off the pseudo charge circuit. This also means that the control board fully relies on the battery for power (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...

Ya, the small one. My issue is...some times, I'm not around and want everything to gracefully shutdown; which is why I have the Raspberry pi with my existing APC/Cyberpower setup, which after a couple minutes of no power, it will log in and gracefully shutdown a bunch of VMs running on a couple...

Just curious, how are you managing the Multiplus during a long outage? My current old /crappy UPS, I have a raspberry pi attached that executes a bunch of shutdown scripts on the servers to gracefully shut things down. I'd like to do something similar, but not familiar with what you can do with...

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

Just for discussion here :) How does the BMS and charger all react and deal with a constant load on the battery with this setup? For example, at full capacity the 1200VA 24vdc version looks like its pulling over 50amps - you'd need a charger that supplies more than that if you are going to do...

The Victron Multiplus series seems to have a switchover in < 20ms which gets close to the APC UPS numbers. Would you suggest the 24v of these? Or another good deal alternative vendor/model?

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. Thanks for the replies. It seems really odd that the industry hasn't made a better UPS option. I'm kind of shocked that there isn't a LiFePo4 option; but maybe its just because of the constant full charge. But even if the LiFePo4 batteries took a big hit on life/charge capacity; I...

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...

What is really weird, is that when I do a full discharge with a steady state resistive load, the Victron & the internal BMS is pretty close. i.e. when using one of those adjustable load tester off Amazon. But in the real world application with the trolling motor...that is when the two diverge...

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...

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 think I'm going to have to call SoK on this. I did another test yesterday. I used the trolling motor enough to get a reasonable test here for discharge. If I put the clamp on Ammeter, both the internal BMS and the Smartshunt are pretty close. They have a delta - maybe a half an amp when...

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

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...

Hi folks. I have a trolling motor that is 36v. I have 3 SOC 100Ah batteries wired in series. I have a Victron SmartShunt on the Neg terminal near the battery. When I look at the Bluetooth interface between the two management interfaces, there is a discrepancy in the actual power usage. The...

I have it setup so that when the voltage reaches 42.6v that it resets to 100% SoC (the "charged voltage" setting). The reason being is...typical boat electric trolling motor use case: 1. Full charge 2. Use boat, catch fish 3. Return home and plug into charger The point is, I only use the shunt...

Hi folks. First I want to say this forum is awesome. I've learned so much and appreciate all the dialog among experienced folks on this forum. Thank you for all the insight and info on other threads I've posted. Switching gears, I ordered one of those load testers off Amazon and gave it a shot...

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...

Are there any docs on the these settings?

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...

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

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.

Excellent. So the SOK is fully servicable and I can remove the cover and get to the cells. I just wasn't clear if I had to physically disconnect the BMS or not. Thanks for the insight. I'll give it a shot and see about draining the one cell a little at a time to see if I can help it along on the...

Rookie here,so excuse me if this is a dumb question. If I charge to cutoff and one cell is at 3.65v and the rest are at the 3.4v range why can’t i just crack the battery case and put a load on that cell that is high and bring the charge down a little…put the cover back on…charge again and see...

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...