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I’m sorry you had a bad experience. I made a video or two about my experiences with warranty claims with Chinese manufacturers including Seplos BMSs. I learned a few things. One is that they often have customers damage their products and claim a warranty. This has lead them to protect themselves by requiring evidence and multiple communications. It requires patience the same as working with health insurance companies here in the US. I was usually successful when I provided video evidence. Did you do that? I have a video about testing the voltage on the balance leads. Have you seen that video and do you have a voltage tester?

When the BMS did not work on the first kit, I opened the next kit and placed that BMS into the first one. everything worked as it should and is still in operation. I built the next three kits, the second and third kits worked just fine and are still operating perfectly. i installed the first (bad) BMS into the fourth kit and it did the same thing. #9 cell is not recognized. I then placed one of the working BMS in the fourth kit and it worked just fine. in other words, all of the wires and connectors work perfect in all four kits, we just have a bad BMS. I supplied photos and screen shots of the whole procedure, to no avail. They are willing to do what ever it takes to get the sale, after that we are on our own.

@@stevenfrazier8939 is it possible that the number nine wire has a bad connector? One of my terminals had a bad crimp on one of the wires that I assembled. My testing showed the problem. It wasn’t the BMS, it was the terminal that I put on the end of the wire. When you swapped out the BMS, did you use the same wiring harness or did you just change out the BMS? I would continue to provide what they are asking for. That is what I have found to work. Did you watch my video about warranty with Chinese companies? There is one about Seplos and another about a Ruiden power supply. Just be kind in your communications and you will have good results.

When the BMS was not working I used all the same wire harness and just changed out the BMS. by the way, after installing it into the fourth kit, the BMS does not read #8 & #9. I have been in the computer industry since 1990. I started SDF Computer that year. I have built and tested hundreds of components over the last 34 years. I know what I am doing. I started working with computers and software in 1978. My dad helped develop and install the early warning radar defense system in the early 1960's and he instilled in me a desire for electronics. I have not watched your video on this topic. You see for me it is not about the money nut rather integrity. I am just going to buy a replacement and one as a backup from a different sales outlet and give this over to God and his judgment. This is one of the pitfalls of working with communist based company's

What I do with my batteries is restrain their movement. I don’t care about compressions so much as I do not letting them move when they expand in contract from charge cycles. The reason I do this is because I don’t want that movement to put force into the terminals which can damage the cells. For that same reason I don’t unbolt the restraint until I’ve loosened the terminal nuts. When I build the battery, I restrain the cells movement then I tighten down the terminal nuts. I hope that makes sense. Currently I’m working on our horse trailer that has a living quarters. I’ve transitioned the 12 V house battery to lithium iron phosphate and I’m now in the process of installing a 48 battery with a all-in-one inverter. Hope to have that completed and make a video about it pretty soon. Seems like there’s always things that get in the way though.

Any updates on that yet?

Thanks so much Steven You caught me working on my next little project. Hopefully I can get a video out about it before too long. It is going to be the process I’m going through to convert the living quarters of our horse trailer to operate on one of these batteries so that I don’t have to run the generator when I’m away from power. Hope you have an easy time with your project and I look forward to hearing about your success with it.

Have you tried any boxes upright I was thinking about trying that with a little modifications to put on end fed ex says tomorrow they will be here Jenny is great

Best of luck sir.

I wish it was so. I test the resistance from terminal to terminal. If the resistance is high then I look at the bus bars. Sometimes I have to slightly straighten them. The resistance then comes down to normal. There may be a strong force but it is at a mechanical and leverage disadvantage. If I could tighten them enough, it would indeed force them into compliance but I am limited to 6Nm which isn’t a lot.

@@RayBuildsCoolStuff What size and thread pitch?

Several times I have discussed why I restrain the battery cells. These cells expand when they are charged, and if we fail to restrain that expansion, they will grow over time. The manufacturer recommends compressing these cells in order to increase their cycle life. The larger problem that I see with allowing them to expand uncontrolled, is that if they are allowed to expand the only thing that will be restraining, that will be the bus bars. I don’t want the bus bars to put force onto the terminals which can cause damage to the cells where they connect to the terminals. Flexible bus bars will not help with this unless you go all the way to using wire cabling instead of busbars. Far better approach that has been proven out time and again by multiple users of the technology is simply restrain the cells so that they can’t continue to grow overtime. Other RUclipsrs have experimented with letting them act on their own, but they all come back around to restraining the cells what I do with my cell I have described several times as simply giving them restraint at a level of a warm hug from your mother. Just enough to keep them from growing without actually squeezing them. I use one Newton meter of force on the nuts.

@@RayBuildsCoolStuff Okay that makes sense, it's more about not damaging the cell internals due to terminal strain than worrying about if the cells will expand uncontrollably. On the CATL 280Ah spec sheet I have they say to restrain for at least the first 6 months or 180 cycles.

Who was your salesperson?

Jenny Wu. She has help us get 64 EVE LF280K cells and four non-inverter JK BMS and the four DIY cases. everything has gone well until the bad BMS on the first kit that I built. 34 days and no result is not good. She is no longer responding to my emails.

@@stevenfrazier8939 would you like me to ask her about this?

That would be nice. I am at a loss for a solution. We have a $1,734 battery that is unusable without a BMS. Jenny has been very helpful getting all of the equipment. I just wish the after the sale support was better. I have two more big projects in the works, but I am second thinking how I get the equipment.

Hi I think in this situation I would build some five sided boxes out of 2 inch polyisocyanurate foam. Just join the boxes together and put them over the battery boxes. If you left them like that all winter, the internal temperature would likely stay fine without any heating needed. The BMS will tell you if you get close and then you might have to put a little heating element in but you might avoid that altogether.

The horses are great. Jake’s training is coming along very nicely

I use EVE cells.

I heard from a subscriber that they now have copper buss bars with threaded holes for the sensing wires.

Hi Jeremy. Happy to see you too.

It is flexible nylon cutting board.

Hi Mauro I would use the MB 31s without any hesitation. Part of my thinking is that the way we use the cells is so far below the demands of the EV industry that we really will never push them in anyway that tests their abilities. They seem to be great cells . On the subject of connecting batteries of different capacity in parallel, that is simply not an issue. You can parallel a 100 amp battery with a 300 amp power battery without any concern at all. The use of the batteries in that situation will be balanced by their voltages. As one batteries voltage goes down the other battery will have more pressure to contribute to the system, and they will keep themselves relatively balanced based on their internal resistance and their voltage. I have tested this.

@@RayBuildsCoolStuff Excellent Ray, thank you for your reply, I shall go for the MB31 and see how they perform after the tests and top balance as usual. In any case, like your good self, I like to run experiments so if there are some issues in the future it will only teach us something new. Once again many thanks 🙏

@@9111logic I really enjoy following you on your continued journey.

Hi Sam The settings in the unit will work and as you learn more you may decide to make adjustments but many people don’t. I have videos about top balancing but that should be done prior to assembly. One thing you can do is get a power supply and top up individual cells to get them closer. You will want to get the battery charged until there are cells in the 3.5v range. Some will be lower. You can top these up individually. Set the power supply to 3.65 volts, connect it across an individual cell that measures below the rest and watch. Let the cell get a bit above the others (maybe 3.520v) because the voltage will settle back a bit after the power supply is removed. This may take a long time depending on the variation in the state of charge. If you need to leave it unattended then disconnect the power supply, adjust the setting to 3.55 volts and reconnect so you don’t overcharge the cell. This is not failsafe as the cheap power supplies can fail so don’t leave home with it running, just to be on the safe side. I should probably do a video on this method.

If you are asking about this solar generator, it cost 1200$ I later built another add on for 4kwh additional capacity for an additional 700$ that is shown in another video.

I’m glad you discovered my channel. There are some basic concepts of electricity that will need to be understood in order for this to make sense. While I can’t give a thorough explanation here I will say that when you put together cells into a battery in series, you will add the voltages, but not the amperage When we build a 48 V battery we use 16 cells. Their nominal voltage is 3.2 V so that gives you a 51.2 nominal voltage battery. If the cells are rated at 300 A you will have a 300 amp battery. if you build two of these batteries from 32 cells and put those two batteries together in parallel, you will have an array that is still 51.2 V but will now be a combined 600 A. The individual batteries themselves are still only 300 A. if you were to put 30 cells together in parallel, you would have a 9000 amp hour battery at 3.2 V. In your situation, I would recommend buying 32 batteries cells and putting them together into two batteries, each with its own BMS. I won’t go further in my explanation here, but please watch mine and other videos to understand this. Also do a search for wiring fundamentals. Learn about the mathematics of amperage voltage and resistance in an electrical circuit. Best wishes.

@@RayBuildsCoolStuff what kind of bms will be able to handle thet kind of capacity?

@@idolumerman For 16 cells in series I use a Seplos 200 amp BMS. If however, you are for some reason talking about 30 cells in parallel then you do not need a BMS. I’m not sure what a 3.2 V battery would be good for though.

I’ll look when I get home. There was a global shortage but they seem available again.

Littelfuse JLLN 200A class T fuse Hope this helps.

It took a while but glad they made the change.

The best way to reach her is directly at jennywu896@gmail.com

Cloudy days.

@@RayBuildsCoolStuff Excellent.

@@sh839c have you seen the latest video?

@@RayBuildsCoolStuff Yes sir I have been catching up as well. Great stuff.

It’s a good thought but I think in reality the drying would be too slow to really prevent rotting. Best to be perfect at keeping it out as difficult as that is.