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Wow that is a disappointment about the box 'fit'. They looked good but then the hole alignment, and 'curved' panels. I bet the box took a tumble maybe in shipment? I'm glad I found you're channel. Hang in there, this looks good! I like your attention to detail on the wiring and routing of the heavy cables and the 90 degree sharp bends, etc. Sign of someone who knows what they are doing.

Ok, update here. Been running my 60A 100 Balance BMS now for a couple weeks, with apparently the latest firmware. It active balances while both discharging and charging when the cells are above 3.7V (my setting). For my first BMS, it has been running very well. I have the high voltage protect setting at 4.1V, I believe. Above 4.05V for all the cells (52.65V), it complains about "Cell voltage level high 1" I have my Victron 150/45 MPPT Bulk/Absorb at 52.65V and Float at 52V (54.6V is fully charged for a 13S Li-Ion battery), so according to the BMS, that's like at a 95% SOC. I could reset the BMS to show 52.65V as 100%

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Looks great, but still not seeing the love for DIY when you can buy a grade A based battery for just a few hundred more. I guess if your time isn't worth that much. I'd rather spend the time installing a new solar panel rack.

320Ah total cells ok?

Hi Andy, Looking at your inverter bms movies about jk, I get a mixed bag feeling: cheap, decent balance current, but with different bugs and a non communicating manufacturer. My questions about the newest inverter bmsses: - are the battery settings now stored in flash (if even present on the boards)? - is it true only the ress versions can be connected with five of them to one cerbo without pushing the others siblings out of the nest? It would have been nice if the other active compacter black models that can handle up to 20 cells were compatible in a group of five with the cerbo. can they? Being not so shure if they can, I'll stick to my excisting an regretfully not so accurate and pricy 123smartbms that cost four times the price of the JK ones and need an external current measurement and cirquit breaker too....

To the testers credit.... it does say its power limit is 400watts

Sodium-ion batteries are better for sustainability and national independance because of the "normal' and relative cheap substances that are used to make them.

HELP, I need some of those plugs for making NEW BIGGER charging cables.

Hi Andy, great video. I just bought you a beer (Simon K). You are doing amazing work. I have just seup two batteries in parallel using JK inverter BMS and your videos. My problem, is in the JK PC app(2.70 an 2.80) when the two BMS are in parallel (one DIP set to 0 the other set to 1) I cannot access anything except the "parallel" tab. I cannot change individual BMS settings all tabs are greyed-out except for "parallel". This is for a customer, and I want to be able to change BMS settings via the PC app, remotely not having to visit their site. I was able to configure each BMS separately when one was set to DIP 1 and one to DIP2. What am I doing wrong? Is there a trick to come out of parallel mode in the PC software or something? Many thanks for your time. UPDATE - I figured that parallel mode only activates if one of the BMS units is device 0 on the DIP switches. So I set BMS 1 to be device 0 and BMS 2 to be device 2 (not 1). Now I can ask the customer to flip BMS 1 DIP to device 1 - and now I can adjust settings and have full access via the remotely controlled PC. After changes are made the customer sets the DIP back to device 0. Not ideal but saves me a few hours drive.

Do you have any schematic diagram for this BMS?

Hey Andy, last week i ordered the Luyuan case. Its a bit like the Yixuang ?box but with a better dc breaker. You know the Luyuan box already?

Thank you for making this video, it gives us great ideas on how to do things better, and more cheaply than just buying cheap junk. Don't forget to always use stainless steel fasteners. Regular steel fasteners contain carbon. Carbon is used to make resistors. I have seen high current connections melt down simply because of a carbon steel fastener. If you use longer bolts coming up from the bottom, you will not be relying on the soft copper threads that may loosen, or pull out. Using stainless studs on the standoffs will give you a couple more connection points if you ever need it.

Andy, when are you going to step out of the closet - is this the one you’re going to go ahead and build 20 units? And with JK inverter BMS? Do you think they’re going to solve the missing consumption issue with firmware update?

Your reaction @15:53 holy sh** LOL

Test wasn't done at 25 degrees this is why the capacity is lower.

Just thinking about some past information I was reading on the internet, some sites were suggesting testing the discharge at battery's temperature of 25 degree c (77F). Higher temps can result in slightly higher capacity delivered (4% max), while cold slows down reactions inside a battery causing slightly higher internal impedance and slightly reduced useable capacity.

Also german blood! I have 3 on order for the last 2 weeks. I hope they are without the bent pressure plate issue. I will let you know when they arrive. Thanks for the quick look Andy. Danke!

So if i start from the scratch ... Do i go for seplos v3 and 4a neeey? Or would you recomend jk with active 2a balancer? The are mounted in amys boxes with 280a eve grade b

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Hi Andy, you proved it: there ARE Germans with humor 🤣, maybe this is one of the reasons you left Germany being somewhat different? 😉. I really like watching your videos but am missing just one: multiple RESS BMSses on one Cerbo. For now I stay with my cellboard based flexible bms with hardware DIPswitches for cell balance voltage and stuff written in EPROM but these are way too expensive ( €600 for just one string of 18 batteries) and having the disadvantage of needing extra room, needed for each cell module hoovering above the cell poles.... Can you recommend me a BMS that's central, can control 16 (or maybe 18) LiFePO4 cells, has a balancing power of 1 or 2 Amps and works fine with 4 or five brothers together on a Cerbo (I ordered 40 extra LiFePO4 EVE LF280K cells and want to have 5 strings of 16 cells in parallel). Suddenly I realize: it gets very lonely here......

Thanks

I have 16 cell eve 304 ah Bms jk 200 A How much a what standard courrent should i charge and discharge please ?

It's my first lifepo4 battery, and the xiaoxiang app didn't seem like it was working properly, so I downloaded the overkill app as you said, and it was working better. I think I messed up the parameters trying to match what the battery manual said the battery should be at. All the settings on the bms seemed really high, and I thought it was overcharging the battery. I'm sorry, I just really don't know what I am doing, and thinking I'm doing it right doesn't mean I can. Please help dude.

Hi Andy, thanks for videos showing Your experiences. How can I dispose for a inflate Lifepo4 battery?

actually the first couple of version of the jk bms datasheet had the CAN & RS485 labels switched, until i mentioned it to them and requested a correction, they sent me a corrected one, so if you based your designs on the first datasheet, then jk bms got it wrong for you

I've got 4 V3 boxes with Seplos BMS, just placed an order for 4 more :) I really like the cases, they're not top quality builds however, but good enough for housing batteries. I will actually mount them in two 19" racks. I ordered rails for Dells M1000e bladechassi to place the cases on.

I would be worried about the reduced size of that pin on the bus bar, the surface area is greatly reduced. If it is rigid enough it could only be making contact with the corners of the bus bar. Looks a bit dicey to me.

Can anyone explain why a JK bms wont stay connected to Bluetooth long enough to change settings?

Any news on the JK-Inverter bms? Will you make a video when there is a new firmware with new functions available?

Hi Andy, thanks for the video. How about trying something new that hasn't been on your channel yet. For example, to expand your pool fence solar with a 2 axis solar tracker.

need something like 16S4P or more, building a big battery will not work with 16S1P boxes. Each is one case, one BMS. Having 60kWh or more in one case would be nice, multiple will be stacked. Bet there arent any bigger cases, right ? Threaded rods and plates it will be.... :-)

I have 2pcs of the v4.0. No issues with alignment of the compression plate here.

hello, I have 2 SE-G5.1Pro-B batteries, can you please tell me how to communicate with the computer, through which type of adapter, which application do you recommend; I understand that the connection between the master battery and the computer is made through the 485 / IN port

Carrying handles would be nice

Yes, it's version 4.1 of the box. I have version 4.0 without display and without busbars to the BMS only the thin silicon cables.

Great video as usual Andy. With regards to your issue with the busbars being shortened to fit into the circuit breaker, there doesn’t appear to be much different to the size of the lug on the silicone cable

I don't need a box like that. But it is very cool to see what is available on the market. I did copy your Battery Shelf. Not 100% but almost the same. I am very happy with it. I use the "old" JK-BMS versions with rs485 to USB direct to Cerbo. Works perfectly. I do not use the SOC of the BMS. I only use the Data from the Smart Shunt. BUT, if I would buy some boxes I might go for the EEEEEL one.

Thanks! It was very useful. Constructing a power bank to survive next winter with the powersupply for several hours a day here in Ukraine.

Why do you need a ground on a DC source?

Problem with PCB is again. People who buy this. Check this PCB in every DYI BOX. Check voltage or use plastic screws. Always think. What can,t went wrong, it can be done.

I think the YiX Energy is a far better build. Only a fuse is missing, what you can add yourselves. Update, the breaker alone is not safe enough.

Hello, would this work with ANY inverter or just another Victron

Thanks for sharing Andy, I was only looking at these last week. So it's either the EEL V4, or the Yixiang.......🤔

Bent not Bended

Has anyone ever cut open the flexible busbars to see how they are made flexible, is the cross sectional area reduced, and in this particular case where it enters the circuit breaker how much of the terminal actually makes contact with the breaker when the screw is torqued down especially as it is flat, maybe use some engineers dye assemble then disassemble to see how much dye is then missing.

My brain didn't draw too many Amps to understand this explanation.

4:25 breaking capacity is 10'000A. No need for a ground connection, if the system is not grounded.

Very nice, but I don't like that the communication cable between the batteries runs through the touchscreen. ELL should move the touchscreen closer to the main plus terminal. Also, two main plus and minus terminals would be better as one as well. I wrote the same comment to ELL under their video about this DIY Battery Box and they replied this: ,, This suggestion is very good, we will make changes according to your suggestion when we produce the next batch of shells, thank you. ,, YIXIANG battery box also has the same problem with the communication cable between the batteries runs through the touchscreen.