JK BMS or Daly Active Balancer: How did they do?
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- เผยแพร่เมื่อ 8 ก.ย. 2024
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Welcome to our channel! We’re excited to get into this with you guys and share some of our journey and knowledge of custom van conversions & Offgrid Power.
In this video, we're going to be going through some results after having left the JK BMS & Daluy Active Balancer on a set of battery cells for about a month to see how they do. If you're interested in either of these items, you should watch this video.
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The JK really are a great BMS, good app, BT, and quickly balance suspect cells perfectly.
Even marginal cells will look good at 3.35V per cell, with no charging going on. I told you JK was the best. I’m glad you like them. I have 10.
Agreed, I have 3
THANKS!! I was very confused about the active balancing tab since I only han a BMS
Nice to see that Daly has an active balancer finally. What size cells are you using with the Daly balance vs the ones you are using with the JK?
I'm getting the Daly smart active balancer today
The cells we used in this video were 280Ah.
They definitely make a difference, but still a shame that Daly has never had them built into the BMS.
@@offgrid_power agree
I had to use a bench power supply from microcenter and put all my 12 200 ah lyth prismatic plastic encased cells all in parallel and do a top balance at 3.65 v and the delta is 0.02 0.01 now it's a 3P 4S setup now waiting on my daly smart active balancer today via Amazon I bought my 12 cells for 480.00 Total
That sounds great! What cells did you buy?
@@offgrid_power 200 ah lyth prismatic plastic encased cells
The main reason i have ever had why the voltage reading is completely different through the Daly bms compared to reading directly from the battery is because the bms is inactive.. When it's not active. It will only read and active 3 cells instead of 4. Really weird. I find when reconnecting the balance leads, this reboots the bms and the reading of all 4 cells become active again.
I think that having the balance start voltage set to 3.1 v is too low. This starts the balancer working on the flat region of the charge/discharge curve where it is not possible to ascertain what the actual cell(s) state of charge are. I think 3.4 or 3.45 v is a better balance start voltage as this is where the cell voltage starts to rise towards the end of the charge cycle.
If you use 3.1 and start the balancing too early in the charge process the BMS may actually knock the cells out of balance and only recover the situation at the end of a full charge cycle where the curve starts rising. This effect is worse if your batteries are subject to a lot of partial recharges (with only the occasional 100% charge)
I don't know about this particular BMS/balancer, but if it's a good system, it knows the state of the batteries based on the chemical composition of the cells attached ánd calculates the state of charge for the future during charging based on charge-rate set out to time. This means the BMS knows exactly how the cells will respond to different charging currents over time ánd will already start balancing if one or more cells start to rise in voltage too quickly. But such circuits are quite expensive: just the bare IC's that can do this (Texas Instruments and Maxim are two of the (probably) more of the major brands that offer such IC's) can cost upwards of 15 Euro's (about the same in dollars) or more. They also require a hell of a lot of software, require programming of the right chemistry in memory ánd require the battery-assembly to go through a 'learning cycle': it needs to be discharged down to system critical voltage at a specific set constant current (from a fully charged state, the first charge to full just doesn't count if it's not completely depleted when you started). Once down to sytem critical voltage, the cells need to rest for a few hours (depending on the chemistry, anywhere from an hour to 5 hours should do it) enabling the IC to determine the open cell voltage. Than you need to charge it again to full, let it rest again for a number of hours, to repeat the constant-current discharge down to system critical voltage. Only after resting again and a full charge the IC is ready to calculate the state-of-charge with immaculate precision over the lifetime of the battery-pack.
Does this mean that you don't need to top balance when assembling a battery with one of these BMS?
Yes. The active balancer will take care of that.
initial charging with top balancing should be done anyway.
What's the difference between the silver and the black jk bms?
For the ones we carry in our shop, the silver ones are 4s/8s and the black are 16s/24s.
Using 48v jk bms with over 2yrs, great bms, don't like daly
A month to balance? Under normal use, the the number of hours per day that balancing can be ACTIVE, can be only a few hours, not 24 hours. Did the JK balancer finish balancing much faster than the Daly Balancer? Waiting a full month, with an idle battery, to check the final balance proves nothing.
Balance Open Start Volt- They ALL have to reach that voltage for balancing to begin? Wouldn't it be MUCH more sensible to have it so ANY cell that hits X voltage is eligible for balancing so long as other parameters are met?
Edit: Ah I see you talk about this.
Balance Open Diff Voltage: Isn't it ridiculous that Daly doesn't allow a number lower than 50mV? 5mV...sure that would be nice....considering the cheap active balance boards you can buy are accurate down to 5mV (claimed spec) but more realistically I've seen they go straight down to 1mV. But what is the purpose of allowing that large of a differential? You could have one cell at 3.600and the other 3 at 3.551volts.....I think any sane person would say that the 3.60V cell should dump some energy into the others. While its not a good idea to balance below 3.40/3.45V it would be possible to have 3 3.401V cells not balancing with a 3.450V cell. Yes, eventually the higher cell will further diverge as voltage climbs more rapidly the closer you get to 3.65V but why not allow something like 0.01V open diff value?
I really hate dealing with Daly BMS's at work. JBD is so far superior. JK is too even though its not the easiest to work with
I use the jk bms, its crap! It shows me a 100 ah charge into my battery but when i discharge it says its only 60ah ?????
Have you found a better BMS?
@@offgrid_power yes, i use the jbd bms i was using before the jk, it gives better and more accurate info.
I have had nothing but problems with the jk, it totally went hay wire not long after having it, shut down and could not connect to bluetooth, it just made squealing noise, got in touch with seller and they told me to open it up and remove a transistor from the pcb that controlled the buzzer, worked but now get totally erratic ah values, also in cold weather below 0 centigrade it shuts down and wont connect to bluetooth unless i pull balance leads out and disconnect from battery for at least 10 minutes. Just no good at all! 👎
@@karldingbatOK. So you had one bad JK unit. That proves nothing. There is going to be at least one failure with every brand.
Can’t listen to a vid’ presentation with all those coughs going on. I hope you get well soon. Shouldn’t do a serious vid’ whilst not well. It doesn’t help with content or presentation. I didn’t see the video through. Sorry
Thanks Shaun! 👍🏼
Forever clearing your throat in every video you do? Dude, go see a doctor