![]() ![]() The only ones that I took off were the 8s 280K from Luyuan as I could not tell if I needed them. My 8s AB worked great and were the only thing keeping my 8s xuba 280s in check. To each his own.īut these do not, I had 3 of them and left them plugged in whole time: So, I'm not judging them harshly for no reason. This means that the passive balancing in something like the JBD/Overkill BMS is probably more effective. For smaller differences, the amount of current is proportionally smaller. I measured less than1A when I intentionally created a 0.8V imbalance between two adjacent cells (2.5V and 3.3V). The "2A" rating is assuming that there is a *HUGE* misbalance between cells. They will virtually never balance at a meaningful current.This was the crux of what Off-Grid Garage showed, if anyone wants to go watch his videos. Moreover, it will defeat your careful top-balance the first time you get the cells towards the bottom end of the discharge curve. Since those moves are clearly less than 100% efficient, you are losing energy from your battery. Meaning, it will be meaninglessly moving energy all day long as you cycle. If you have top-balanced cells, the balancer will work like hell to bottom balance them when the cells are low, and then work like hell to top-balance them the next time you charge. Balancing all the time is just a bad idea.Besides that, there were two other things I realized, back when I thought they might be good: ![]() So I am NOT a fan of these $2.99 active balancers (cost of parts, not what we pay) because it almost wrecked my battery. Suffice it to say, I would *NEVER* trust these cheap little boards to be plugged into my battery without me checking multiple times per day. That board had clearly failed and was taking my battery (and maybe my house) with it. Then I found that about half of the caps on the Hultec 8S capacitor balancer were rapidly approaching 100☌, too hot to touch. That is to say, one (or maybe two?) cells were dropping dangerously low, below 2.8V with the rest above 3.2V. Then one day I opened the battery box to find that the cells were WAY out of balance. I was testing the system over a few weeks, including in cold temps. I have several of these, and had decided they were a good thing to add to my Overkill 8S BMS, and to have spares. ![]()
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