Most reacted posts

It is very possible that you just are not getting enough from your 100w solar to fill up the battery. plug it into a 110v charger and see if it will fill up. 200Ah of LFP with only 100w max solar is pretty light if you have any regular loads.

Two questions. 1. Andy at Off grid garage tested the new JK-B2A8S20P-H BMS's in a 4s setup and it did everything as advertised... except for the loss of magic smoke from one of the 20 discharge Mosfets during a 205A disconnect. It still worked perfectly after that while running on the...

Given my northern latitude, I plan to get the heated version. If you heat directly from the BMS, it should not create unbalance bewteen the different banks because they are all still connected in parallel. My plan was to let the BMS heat function drive a relay so that the actual load was...

Question for Hankzor purchasers. Do the deliveries come in about when the tracking indicates or are they typically later than shown?

Avoiding the rat's nest is why I would like to cut the sense wires to length. given that the distance to the cells varies by about 18" from longest to shortest, I either cut them to length or will need to have coils of wire to take up the extra length. It seems to me that coils of varying...

I suspect that they reason that he is setting OVP low at 3.55v is that he has the charge controller set just high enough to trip when the high cell gets to 3.55 but if it did not trip, the charge controller would stop charging before the high cell hits 3.65v. This would still provide redundancy...

Where were these shipped to. I just received my ( 8 ) 280K cells for $149 each plus about $5 per box and were delivered to Washington state in 3 days.

Sorry, I still cannot tell which type you are referring to.

Thanks for the info. I am really hoping that I can use this unit because I have been really impressed with everything I read about it. Now if I can just find a place that it will fit. I want to put it into my Catallina 30 sailboat and yesterday I did some CAD design (cardboard aided design)...

On my boat, I have a fiberglass battery box formed into the settee which is 27¾" x 9½" x 10¾"H. Given that space, I can configure two options (2) 4s 280ah batteries each with their own BMS or one 2p4s with a single BMS. I will be doing the latter with the JK BMS.

Here are my settings. I have balance turning on at 3.34v Charge balance off (static balancing) I have charge to 14.1v and then turned off both charging and discharge so that the cells are static except for the balance current. after 25-minutes, the low cell has dropped 11mv and the high cell...

After making several more rounds of charging to cell #3 OVP and then static balancing for 24 hours, I am starting to see some significant progress. This time I was able to recharge to 14.26v. This is the first time I have been able to get the pack voltage above 14.1v. The delta is 192mv with...

I am also inclined toward A because most of the buss bars will only have 1-cell current. The tricky one will be the connection between s2 and s3 where the single buss bar will be carrying the total current instead of 1/3rd.

That is where I am now. I am building a 2PS4 and a 3P4S and have heard that they will have a 4S JK in a month or so.

I was making the order and the transaction failed. The popup said that I could appeal or cancel. I clicked appeal and that is when I got the requires for way more personal info than I would ever provide.

FWIW. I plan to add a Samlex EVO 1212F-HW to the boat thanks to you. I had never heard of them until I was reading one of your posts. The Samlex is almost unheard of in the boating community and I am not sure why. When I first started talking about using one, I got flamed for it with many...

I received my eight 280K cells on Friday. They were ordered last week. All looked good with 3.32v each, no dinks, no swell, no scratches.

I had asked several JK users if they had used a meter to find the resistance of the wires and was always told that the values were created by the BMS so it seemed that this was being done which is why I asked the question. If the length does not mater (because the BMS is adjusting itself for...

@ghostwriter66 What ever happened with the your $2,948 purchase?

This was for a purchase from the Hankzor store.

It was my regular BA card which was used earlier today.

I already have gasoline on the boat because the outboard is gas powered and I currently use one of the generators to power my two 30A Victron chargers. I am just looking at options. As for CO, I tie the generator into the inflatable and run the power cord into the mothership which removes all...

I just tried to purchase my cells on Alibaba and got the same thing. :mad:

Any word about when the 4S JK BMS will be out?

I have a simular post on a boating forum and several have expressed a concern that cells in the 50Ah - 100Ah range cannot put out enough amps to start a small diesel engine. This engine is currently starting fine with a 14-year-old group 30 AGM with a 950CCA rating. Would that be too much...

I do that on my motorhome but how much current are you trying to push through that 12AWG wire? In the case of my motorhome, I have a 160Ah dumb internally regulated alternator and it is connected to the start LFA batteries. There is an interconnect solinoid that connects the start bank to the...

This is the only card I can use for this purchase. I will give the bank a call in the morning.

I looked at all of the 4s BMS's I could find on that site and they were all passive balance in the 90mA range so they are not JK.

I have the same problem with ordering my cells on Alibaba. I have no other cards do use so do not know how to proceed.

I found the same one on Amazon but it is $76 but I could have it later this week instead of sometime next year.

Any update on the testing of the 4s failures.

Well, I am committed. dreaming, plotting, planning no more. Let the building begin. I finally did it. My LFP is on its way. ( EVE 280K (560A @ 12v) From Docan Power 4s JK BMS with 2-amp active balance and 200-A charge/discharge capacity (350-A surge for 5 minutes) from Henkzor Flexible...

Does anyone have a US source of big silicone insulated wire? Something that does not take a month to get?

I made a suggestion to Nami about changing the programing but did not ever hear if they would or could change the programing. It would seem to me to be a simple thing but who knows. The way it is, it is not very useful. The idea of heating is to allow cold weather charging, but they have it...

Here is a video from Off-Grid Garage.

The only spike load that I might have is the inrush from a 500W anchor windlass. I have always been in the habit of running the motor while pulling the anchor Running the engine while using the windlass served two purposes. 1. to support the battery for the relatively high load from the...

I have a couple of 460Ah battery packs and during the inisial charge, I am seeing 250 mv of difference in cell voltage when charging at 14.0v. With this delta, I cannot charge any higher than 14.0v without getting a LVC on the cell with the highest SOC. The high cell seems to stablize at...

FYI, I have a Magnum MC1212 with ME-RC and BMK on my motorhome and 11.6kw of LFP. To charge LFP with your Magnum you must have either the ME-RC or better yet, ME-ARC to set the charge perameters. Out of the box the charge profiles are wrong for LFP. The BMK is very handy for checking SOC and...

$122 and change. I would have prefer to replacement. Don't have a lot of confidence long term so I will probably buy another one and we'll get it from Docan Power because their packaging is always top notch

All cells were checked for voltage as they came out of the box and five had 3.32 and the other three had 3.31. All QR codes were checked and the date of manufacture was between 12/20/21 and 12/29/21. I have not been able to do any more testing than that because most of that equipment is still...

On the new generation of EVE cells, I see that height of the cell to the top of the terminal is 207.5mm±0.5mm but this is without the laser welded studs added. What is the actual total height of the cells with the 6m studs and with the newer Threaded Screw-in Terminal Studs? I have a height...

I have 7.4 loaded now. What differences does this version have over that version? Do you have a list of changes?

Did your wire resistances change in a rational fashion for the lengthened wires? I would like that you should see more resistance on that wire.

Anyone have suggestions for base settings for the JK 4s?

My JK BMS has two temperature probes but the wires are very short. My BMS is mounted outside of my cell encloser and both probes are only long enough to reach the first of my 8 cells. What is the best way to lengthen these wires so that I can test the temperature at both ends?

Those look like mostly default LFP settings, I would suggest changing the OCP Delay from 300-s (5-minutes) to something faster. I also changed the UTP from -20ºC to +3ºC and UTPR from -10ºC to +5ºC.

Opening the case and adding charge or load to individual cells is a very quick way to balanse a pre-built pack but there is still hope for those of us who have sealed, non-cervicable packs. This is where I started. This is actually not the worse case given that this pack had been held at...

late last summer me and several others who received some of the first JK B2A8S20P BMS's had their units fail to boot. since then, I have not seen as many comments about this problem. Are we still having that problem or has JK resolved the issue on the later units?

Thanks for the update. The shot that shows 13.85v has a delta of 24mv. That is about the point that my packs start to get a big divergence. If I when to 14.1v I had a OVP cutoff with a couple of hundred mv delta. It would be interesting to see what delta you have at 14.0v.

Did you get your display and does it work as expected with the ability to turn the BMS on and off?

I have had problems getting any wire less than 18-guage to make a good crimp connection. I usually strip twice as long a section as needed for the depth of the terminal and bend it back on itself to double the diameter of the wire. I also use shrink tubing with adhesive over the connection to...

Is this in regard to just Hankzor or all JK suppliers?

I was thinking LFP, not FLA. given how quickly the IR changes above the knee is what got me to thinking about this.

I am hoping that I will not have any problems with the app. I did have problems at first getting it to down load due to security issues but one of the other group members walked me through the process and then it loaded. Good luck.

Could you post a photo? I am planning to use the 8S 2A 200A BT for a 2P4S 280Ah pack for my boat with a fixed 12v/24v boost converter.

Same. My 4s was packaged in a very flimsy and way too big a cardboard box with just a single layer of thin bubble wrap. It was so poorly packed that it rattled around inside of the box. The heat-sink plates were bent with one mounting ear bent 170º. I asked for a replacement, they refunded...

This was the assumption that I was using when I purchased my cells and I did not care that the cells did not meet the full spec for an AV application.

After our first cruise with the new LFP battery we are thrilled. It was 6 days and 2-hours and during that time we did not give any thought to power conservation. We had the fridge, freezer, and all electronics running the whole time. We used a total of 626 amps for an average of 102A/day. This...

How did you do that. I was not able to get them to respond to me. I ended up buying another.

I saw that add but did not realize that it eliminated the startup problem. Have you gotten yours yet?

My BMS and bits and bobbs for the regulator showed up today. Unfortunately, the cover plate / heat sink was pretty mangled in shipping. Two of the mounting ears were bent with one almost 180º. Both the top and bottom plate are also bent outward between the case screws which seems to indicate...

On mine, when it was in the boot loop it could not log into the app so there is no way to change the FET settings.

My BMS showed up today. Unfortunately, the cover plate / heat sink was pretty mangled in shipping. Two of the mounting ears were bent with one almost 180º. Both the top and bottom plate are also bent outward between the case screws which seems to indicate that the FETs have probably been crushed...

My coach is all electric, so it is a total hog. I use 300AH to 400Ah in a normal day when you include all of the computers and monitors I have running. When I got my two batteries, they tested out with 925Ah total which is 5Ah more that rated capacity. The problem was moderately balance...

What is the wire gauge for the sense wires? I have lots of good "red" ring terminal connectors that handle 16-22 gauge but smaller than that can be a real PITA. If they are smaller, have any of you tried to crimp them into an appropriately sized ferrule and then crimp that into a standard red...

Thanks. My configuration would benifit from that geometry as well. How did you get enough heat to get a good solder joint without so much heat that you damaged the other components?

I have seen open-source DIY BMS designs. Just not one that has a very well-functioning 2A active balancing.

I already have the specialized alternator with external regulator which has all of the protection and works fine. I have looked at the Dakota Lith dual purpose batteries but given that they are a black box there is no way to tell if the cells are any different or it is just the BMS. My thought...

In one of the videos in the Off-Grid Garage, Andy comments about the 7ga wires for the B- & C- battery connection being too small to carry the rated 200amp Anyone have any work-arounds for that issue?

Can anyone tell me how long the 7ga leads are that Hankzor is providing for connection to the B- and P-? I plan to mount the Jk to the end cap of my build and hope that they will reach form both - terminals to the BMS.

wouldn't this statement be true of all BMS manufacturers?

Here are the drawings I used for the printing. I do not have the stl files.

How much did the shipping cost?

They are not actually Honda's, so I am not speaking sacrilege. :LOL: I got them from Costco for $475 each. The pro of this idea is that it would already have a case, engine, tank and alternator. I could possibly create enough room by removing the invertor to house the external regulator if...

My original intent was to mount the BMS with the sense wire plugs on the bottom, but the sense wires are not long enough to reach the far end of the 2p4s string of batteries. I am considering putting the plug-in terminals on the top instead of the bottom but then it creates a problem of how to...

Thanks. Right now, I am making the corner pieces 0.15" / 4mm thick but do not know if that is enough to get under the buss bars.

I have a Magnum MS1212 2000w / 100A 12v inverter-charger in my motorhome. By batteries are a couple of drop-in 460Ah packs for a total capacity of 920Ah I am trying to decide which charge profile to use with I am plugged into a full hookup site. I have two programable profiles that should...

Anyone have any experience with Basen Green aka Shenzhen Basen Technoloty Co. Ltd. aka Emily Peng / Daria Long? Please share your experience. I ordered two 12v 460Ah batteries from Basen Green and assumed that it would have full tracking like every other product that I have ordered from...

If mine goes dead, I can flip a couple of switches and the AGM start battery will run the house loads but will lower storage. It would be plenty for navigational electronics and running lights. I could then run the engine twice a day to recharge the AGM and to cool down the fridge and freezer.

If you are holding the cells in place with springs, then they will move outward due to swelling. If you are using a typical flat buss bar, that movement will create a tention force between each coupled pair of terminals and they are the weakest link. That does not sound too healthy to me.

Thanks for the reply, Mike. You said that they server supply can supply 13.8v. What do you need to do to get that? What I am hoping for in this bulk charger is something that would put out significant amps up to about 13.6v - 13.8v. After that, my Magnum can finish off the charge. The power...

I would see that coming from the normal expansion of the cell as it nears full charge. The specs say that they should increase in thickness by about .5mm.

I got my eight 289K cells on time, last Friday and they appear to be perfect so far.

Any suggestions and/or links to vendors for the JK BMS. I am looking for the JK-B2A8S20P model with the display / on-off switch. How long did it take to receive your units once you ordered.

Yep, it is nice to have choices. I was able to work the cost into the budget and have a family cruise coming up in July.

It is true that lead start and LFP house works very well together and that is the current system I have. My high-output externally regulated alternator goes to an ArgoFET battery isolator which sends power to both battery banks. The only problem with this system is that when cruising, I often...

That is what I got with mine. Amy sent me three extra so that I could make the 2p4s connections. I will be upgrading them to flex buss bars but they will not arrive until the end of July.

I am getting a couple of Basen Green 460Ah @ 12v packs that have this BMS installed. In looking at the specs, it appears that the range of values is pretty small. For instance, it says that the Discharge protection is limited to 2.4v - 2.6v and I like to set mine at 3.0v so that I have some...

For long term I would say yes. That is why I set float at 13.4v (3.35v/cell) or lower. You still need to raise it to a level above this to recharge the battery (bulk charging). In the report you posted, they call for bulk charging at 3.65v/cell but that can only be done if you are perfectly...

For some more info, most of the big loads are AC and will be supplies by the 50A 240v connection. These include refrigeration, floor heat, cabin heat water heating induction cooking, air conditioning, computers and TV's and of course the battery charging. The DC system runs lights, hydronic...

I concidered the cell heath. One thing that tends to show that to not be the case is that I get very simulur delta voltage at the OVP and the UVP. If the cell was weaker, I would expect the delta to be much greater at one end or the other. Most cases of mis-matched cells I have seen will have...

Not really. Just set it to whatever charge parameters you like best and let it work. It will take a bit longer, but it will still get the job done. In the meantime, there is no problem with the cells being out of balance other than that they will not have quite as much capacity as they could.

Do you know how long the 7ga wires are? I will not have any high demands so am happy with the 7ga size and the suppleness is nice. my biggest load is a 500W invertor so nothing major. In the post supplied, I see 10cm but that is not the 4s. Do they all have the same length? If it is that...

I noticed that your "Continued Charge Curr." is set at 60A but I thought that the total of your charge outputs was greater than that. Are you getting over current shutdowns? Can you provide screen shots of your total error log?

FYI, I have 2/0 wiring on my boat primary circuit but that was too big to connect to the 6mm screws on my EVE cells. Also, the BMS I am using has two terminals for output and my pack is a 2p4s configuration. Given this, it made sense to use two conductors until I get to my shunt or fuse block...

thanks. I would love to get the name of the boat because then I can track it on AIS.

It also does not have very good programming logic. It only turns on heat when the BMS turns off charging and vise versa. I would rather see it come on just a bit before low temp cutoff so that the charging does not cut off. I would also take the power from the charge source rather than the...

These packs are 230Ah @ 24v in an 8D format. https://www.basengreen.com/product/24v-230ah-basen-rechargeable-lithium-iron-phosphate-battery-pack/

Can an 120v AC resistive heating element be used to create a predictable load to test the total battery capacity? I am just thinking out loud so this could be drivel or just plain ignorant. If I have a 120v 500W resistive horse water tank heating element, could I connect it to my battery to...

I have a question about inverters connected to the JK BMS. If the JK shuts down for over or under voltage what happens with the inverter. Will there be a current spike when it comes back on?