So if you had bought a complete battery - what would you have spent? Did you get $500 out of them?This battery cost me over $500 and didn't last 2 years. So much for 3000 cycles.
nothing useful to offer after rereading your post. IE I was wrong.Unfortunately, your clamping method may have contributed to failure, and if I was Xuba, I would claim that was the cause. You ensured the clamping force was concentrated at the edge of the cells. Had you simply placed plywood or some other rigid plate at each end of the battery, there would have been no stress concentration.
I originally just had the cells taped like Will does in some of his videos. When I noticed them expanding is when I put the clamps on them. Again, I'm not sure where I saw that clamping method but I did see it done somewhere. I did not tighten them down enough to collaspe the corner of the cells as you can see in the photos.Usually cells that bloat like that were severely overcharged and that is why people are asking about the BMS.. not because of how they are strapped. People are using these cells with no compression and don't bloat like that.
Edit: That and/or charging when frozen
Yours is an anomaly since so many people use these cells and don't have issues like that. Did you change the settings on the BMS with the phone app or leave them at default?Did I get my moneys worth? I don't think so. Would I do it again. I'm definitely hesitant. Not anytime soon. I'll just use lead acid. At least I know how long it will last and it's cheap. All those selling points for Lifepo4 didn't play out for me. Not with these cells.
I learned how to configure the BMS and create 3 custom profiles. High, Mid and Low. These were different levels of charge and discharge. I many used the Mid profile. This wasn't a charging issue. I had a runner from the very beginning. It wasn't that bad but it got gradually worse. I should not have excepted the shipping damaged cells and I should have never used the clamps. From recently research, it's not required, but would supposely increase cycle life. At least it wouldn't have given Xuba a easy excuse to deny a warranty clamp but I still believe that they would have come up with something else. Hopefully I'm wrong and others have/will have better results. I was a guiena pig.Yours is an anomaly since so many people use these cells and don't have issues like that. Did you change the settings on the BMS with the phone app or leave them at default?
I learned how to configure the BMS and create 3 custom profiles. High, Mid and Low. These were different levels of charge and discharge. I many used the Mid profile. This wasn't a charging issue. I had a runner from the very beginning. It wasn't that bad but it got gradually worse. I should not have excepted the shipping damaged cells and I should have never used the clamps. From recently research, it's not required, but would supposely increase cycle life. At least it wouldn't have given Xuba a easy excuse to deny a warranty clamp but I still believe that they would have come up with something else. Hopefully I'm wrong and others have/will have better results. I was a guiena pig.
How damaged was the shipping? Any kind of denting should be considered non-usable. I'm sure a few people get away with dented cells, but every time I've had dented cells be it cylindrical, or prismatic have ended up problematic. The problems may not manifest until later.
Also the clamping would have been perfectly fine had you used rigid plates at both ends. Not saying that was your problem, but it sure looks suspect.
And lastly, don't fall for the fixture, compression, clamping (whatever people call it) as being not needed. It is, prismatic cells will bulge overtime, and the fixture will help keep that in check even if it's just fiber tape. I've used these types of cells since 2011.
Charging to 3.65V per cell without a BMS ? I would not attempt that even with the most perfectly balanced pack I've ever seen. The difference between 3.65V and a cell being permanently damaged is like the equivalent of a percent or two SoC.I'm really not trying to be a dick, but it looks like you just presented evidence that you charged without a BMS:
No BMS installed, and you literally state you're going to charge it to 14.46V with your PD9200 series converter.
If you charged without a BMS, damn good chance you started this failure the first time you charged without a BMS.
I'm really not trying to be a dick, but it looks like you just presented evidence that you charged without a BMS:
No BMS installed, and you literally state you're going to charge it to 14.46V with your PD9200 series converter.
If you charged without a BMS, damn good chance you started this failure the first time you charged without a BMS.
The problem with my statement and your conclusion is my charger could not and did not charge the battery fully because it is a led acid charger. It fact, I originally thought there was something wrong with the battery because the charge would not last very long. I later learned after connecting the bms that trying to charge the battery with a 1000w inverter connected running two refridgerators would not allow the battery to fully charge. In fact, with that charger, even without the inverter connected, it would never charge the battery above 13.6v.
So you are dead wrong. And I must say, you clearly don't have to try and be a dick. It appears to come naturely to you. Please ignore my post going forward. Your feedback is not helpful to me. Never has been. Thanks!
Hover over my name and click Ignore. You'll never have to hear from me again, but I'll still get to comment so others may learn.
Over 4000 post in less than a year. Don't you have anything else to do....a life outside of this forum? Is this your only way to feel important?
LOL.. you know you've won when somebody gets defensive and starts attacking you on a personal level. Oh well. I showed you the Ignore button.
So this is your idea of winning? Well congratulation! You are such a winner. Hopefully someone will give you a medal.
And I will ignore you. And hopefully you would ignore me.
I'm having a harsh moment of introspection.Over 4000 post in less than a year. Don't you have anything else to do....a life outside of this forum? Is this your only way to feel important?