As expected ? Series tied with 4 mixed 100Ah LiFePO4's Long day's results.

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[@sparkletornado5890]

The batteries are not doing anything connected in series without a load or charge. You are only going to have problems when charging. While you are waiting for the balancer put them in parallel and cycle them from 13 to 14.4v with absorption. That will be the best use of your time and get the top balance done. If you want to do experiments hook up the 48v charger without a balancer. Set the charge voltage to 57V and see which one runs away above 13.6v then you know which to check when you have the balancer connected. But what ever you do just make sure you are having fun.

[@ricardomarcelino8388]

Hi Bob, the pulse you see every 15 minutes is actually your BMS shutting down, and the 14,2v are the intended voltage sent by the charger. When the BMS comes back, it allows 30 amps aging until a higher cell tops up and shuts the BMS again. If it was full it wouldn't go to 30 amps immediately, it would ramp down as getting to 14,2v as it did with the second battery. The first battery will give you problems Ina system if it shuts down. The reason why the last battery took so long is because it's just lower state of charge. Voltage is a bad state of charge indicator unless absolutely full or absolutely empty (and the 10% before and after that). As I mentioned in your earlier video, stay away from 14,2V and you should be fine. Work at 14,0v × 4 for bulk and 13,8 × 4 for absorption and 13,5 × 4 for float. Be careful about 48V, 100ah at 48V DC is a dangerous voltage. You also need a class T fuse, because that voltage can ark and jump a longer distance form one side to another from a "regular" DC fuse. Very interesting video as usual. Alohaaa from Madrid Spain!

[@junkerzn7312]

You have a fuse right there at 12:20. That hot spot. 120F is not unusual when a lot of amps are flowing through a fuse. The fuse is a thermal device after all... the fuse element needs to melt in order to blow. But that is another reason to be sure to size the fuses correctly to be AT LEAST 125% of the maximum regular load you expect on the circuit. If you size the fuse too closely to the load it will get hot without blowing, and that can cause other problems. The same applies to breakers. Fuses and breakers are both thermal devices or have thermal components in them. That last battery just wasn't near full. That's why the voltage seemed to get stuck. The battery was probably sitting at 70% or 80% or so. LiFePO4's voltage doesn't climb quickly until it is past like 95% full. At all other times it climbs only very slowly. It also looks like the battery might have been hitting a high-cell disconnect at the end there... the cells might not have been well-balanced. That sort of issue usually goes away after a few charge-to-full cycles and the battery has had a bit of time to get the cells back into balance after a long rest period or not-charged-to-full period. Also, the AMPS going into the battery will push up its voltage, so it might seem more full than it actually is when you look at the voltage while a lot of amps are flowing into the battery. -Matt

[@mannyfragoza9652]

One thing I forgot to mention in your last video if you want the voltages to be closer to each other is to connect them in Parelle when resting. The batteries should all be very close to the lowest battery voltage after a little bit of time. Looking forward to the next episode.

[@junkerzn7312]

Note that there are ALWAYS going to be deviations between the batteries connected in series. It isn't something you can remove. The only time the voltages will be very close to each other will be the top-balance point. The chemistry is the same, but the cells still have small differences between them. The curves aren't exactly identical, so there really is no way to avoid the deviations. -Matt

[@ProjectsinParadise808]

Copy that brother. Mahalo!🤙

[@offgridwanabe]

After the series is in place find the lowest voltage of the 4 batteries which now becomes the maximum for charging the bank. I never try to get even that much usually lower the charge to around 3.41 per cell. But always have fun figuring it out.

[@offgridwanabe]

Your system is lower voltage than mine they must have very careful bms's.

[@rickharold7884]

That is so fun!! It should work fine. Maybe after a while some balance issues. Sounds like the cat had some opinions!! Watch the 48v w shocks. It’s a little more likely esp wet hands. I know ur careful but I’m compelled to worry. Ha ha Looking forward for the whole setup. So cool and fun!! Aloha brother

[@ProjectsinParadise808]

The cats always have an opinion, especially if I'm talking and it's not about them! I'm double checking and cruising right along. So fun. I dry the sweat from the palms if need be! Haha! Aloha brother!🤙

[@TheRenoir]

From the test I noted OffGrid Basement channel did on the Cyclenbatt, it's no wonder it took longer to charge is it appears to be a beast capable of supplying very high amps for more than a few seconds. You may end up having to utilise a Battery Balancer like he suggested in a previous vid. Learning a lot from you guys. Thanks.

[@ProjectsinParadise808]

Just put a balancer on it. Looking good so far! Aloha!🤙

[@TheRenoir]

@@ProjectsinParadise808 Yes, saw your LiTime Balancer test. I am definitely going to utilise the same on all my systems. Thanks for your efforts.

[@jimbor2279]

When the batteries are connected together properly… the ones with the higher SOC will continue to charge the batteries/battery with the lowest SOC until an equilibrium with all batteries are met. The problem child battery taking a charge differently might be because the internal cells were out of balance. Once the batteries are connected properly, and the system is put into use, I believe, that the highest voltage you can get into the batteries will actually be the lowest voltage of the one battery that doesn’t fully charge up to the same state of charge as the rest of the batteries. When connected properly and put into use, they will find their equilibrium and balance. It’s not a perfect world, but it will work and it will work well! Excellent videos you forgot to let me know where you are so I could bring the popcorn and do the all nighter with you.

[@car2069]

no dude, just NO. this is not lead acid. This is not how this works.

[@jimbor2279]

@@car2069 I have tested and have put this into practical use for years … I would respectfully say … I believe your incorrect

[@junkerzn7312]

@@jimbor2279 LiFePO4 in series will not charge or balance each other out. In fact, LiFePO4 in parallel won't balance each other much either, except when the SOC differential are really huge, like one battery is at 80% and another is at 20%. But once the SOC's get within roughly 50% of each other, LiFePO4 batteries in parallel won't balance each other. In the series case it's because LiFePO4 doesn't have the same over-voltage characteristics that lead-acid has. And in the parallel case its because LiFePO4 has an extremely flat charge and discharge curve... the voltages wind up being too close to each other even at wildly different SOCs for there to be much (or any) passive balancing. LiFePO4 behaves very differently than lead-acid in both series and parallel configurations. -Matt

[@iamg000]

ARE YOU TRYING TO END THE WORELD!!!!! 💣🕳🦉

[@ProjectsinParadise808]

But I feel fine! 🤣🤙

[@cliffandrews]

Bob, is part of the reason you built the Bungaloha was to get your projects/experiments away from the house for the fear of fire? 😂 I'm betting on a 48v All-in-One being hooked up to them. Maybe a Sungold ? Victron is really nice but $$$$

[@ProjectsinParadise808]

🤣🤣 Made me laugh out loud buddy! Good guess! Yes sir, all in one up next. Different brand though. Aloha!🤙

[@william38022]

Pretty cool 😎👍

[@ProjectsinParadise808]

🤙

[@davef.2329]

No electrical engineer here, but it seems that in series like that, your greatest limitation is whichever the lousiest, cheapest BMS is out of all four of them, or plowing the entire current flow thru the weakest electronic component/connection point internally. More info on this is welcomed and appreciated. If you load that system up, pay close attention to battery case temps so the Bungaloha isn't accidentally burned down. Aloha 🍍

[@junkerzn7312]

You are correct. However, remember that at higher voltages currents are lower for the same amount of power. Four 12V 100Ah batteries in series with 100A BMS's.... well, at 48V (more like 52-54V operating)... that's over 5000W. So generally small differences in BMS capabilities aren't an issue for a series configuration. Big differences, of course, would be an issue. If one of the batteries has a 20A BMS, then 20A is all you get out of the whole series pack.

[@kimmogensen5390]

The best would be to asemble a battery from primatic cells (it should not be a problem for you to get a seller to sponsor your cells) 16 280A cells a simple bms like daly 100 or 200A smart bms that one you can also make in 4 boxes so its possible to carry around and break down into 24v or 12v batteries with exchange of bms but it would be a very good main battery i live of 2x 24v 8s 280A batteries i have cooler airfryer and aircon in the summer and live in northern Europe it is very nice to have a couple or in my case 2 fairly large batteries so when there finally is sun in the winter they can take all that the panels can give and can go for days without needing charging,,,

[@jasonbroom7147]

Probably goes w/o saying, and I haven't watched the whole video yet, but that Cyclenbot is going to be your "weakest link", as you test the 48v series-connected battery. Looks like it has higher self-discharge than the others. The 48v equalizer will help with that, but I'd keep an eye on that battery. Double-check the torque setting where that positive cable attaches to the bus bar.

[@ProjectsinParadise808]

I'll keep a close eye on everything for sure. Initial balancing underway now and looking better than I could have hoped, and fast too! I'll keep some updates rolling along as it goes. Aloha!🤙

[@robertmeyer4744]

looking great so far. the one battery may not be as well charged as the rest. they 100 % now. self discharge likely to be different. that balancer will correct for that each time it gets to full charge. you may want to check that one connection the crimp may be loose or the bolt is. I would take it apart. make Shure it is clean. check the crimp then re connect and check again for heat.

[@kathleenmaurici1158]

Great video ❤

[@ProjectsinParadise808]

🤙🏄🏼

[@TheTimshady337]

Hopefully you checked the temperature of the third battery while charging. The way it charged seems kind of odd to me. I'm may just be the parasitic draw of the bms brought the charge level lower than the rest. We will know when you check the voltages in the morning. If it is drawing power, it will be the weak link in the setup. If it holds its capacity then it will be OK. I don't remember if you capacity tested it on an earlier video.

[@davidanstice]

You can be more precise with bottom balancing with the voltage.

[@ProjectsinParadise808]

Interesting....sounds like another test coming up! Mahalo!🤙

[@apocalypticminister1369]

I'm watching and a bit concerned for you, sure you know what you are doing... But, let the hard nosed geeks hate... Do your thing Robert, we are watching brother... Keep your ears and eyes open 💪🏿

[@ProjectsinParadise808]

Having a good ole time. Tinkering in the shop is always a good day brother! Aloha!🤙

[@stereomojo]

Do you use OFC wire?

[@davidanstice]

You are doing what’s called Top Balancing. I recommend bottom balancing. You’ll need a rig, look up on KZbin for how to build a bottom balance rig. You’ll need a resistor and a device to shut off the power once you reach the low voltage. But with the potentially different chemistry in each of those batteries, not sure how this will work. Be safe! Consider fireproofing the area. Don’t burn down the Bungaloha!

[@junkerzn7312]

No, yYof reasons including the basic issue of generally not wanting your LIFePO4 batteries to ever get too low under normal operation in the first place. Low voltages do more damage to the cells than high voltages do (for LiFePO4). The LiFePO4 chemistry is tailor-made for top-balancing. -Matt

[@davidanstice]

Obviously you’ve never done bottom balance. I agree though, you don’t go too low. Find the recommended lowest point for your battery and use that. I built an electric car, and had to bottom balance each cell. Took a long time. But, because I did that, no BMS was needed. Contrary to popular belief, it’s actually the BMS that destroys batteries over time. Once you’ve bottom balance each cell, connect the to each other in whatever configuration you’re using, then charge them. They stay together beautifully over time.

[@anthonyrstrawbridge]

Aloha

[@ProjectsinParadise808]

Aloha brother!🤙