How Daly BMS balances your cells and ... actually works!
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- Опубликовано: 21 окт 2021
- That balancing problem of the Daly BMS did not leave me alone. I needed to know how it works and why so many people say it keeps their battery in balance. So I set up the biggest test environment ever 😎 and failed...
Does the Daly really only balancing the one cell with the highest voltage as Paul said? It would make sense and could explain why it is working at all. It would need to balance the cells over many many cycles though to have an effect.... or is there even more to it? We will unveil all secrets of the Daly BMS in this video!
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I love how Power Paul gets all the credit even though I told you this in my comment in your last video (Which you responded to!) :P Like I said before: Any BMS will only balance the cells that are above either the pack average or above the lowest cell voltage. No BMS is going to ever balance all cells at the same time. Because like you said, that wouldn't actually be "balancing". They only balance the high cells.
Let's go Brandon
Daly was always great! You were he one who made it "bad" with your poor testing setups.
Paul is indeed correct. When you measured the current on the cell 2 the current is negative. So you are not measuring de discharge on cell 2, you are measuring the current going to cell 3 (to the negative terminal). So your conclusion about balancing all the cells is not correct. And you didn't measure cell 1 to triple check your conclusion. And you could try the 0-3.0000A meter from ebay. That one will have enough resolution with its 5 digits.
Really!!?? You both were wrong I tried to tell you three videos ago you wouldn’t listen. You don’t charge your 280 amp hour batteries with one amp! Oh my God Andy go online it’ll explain it all to you
Actually daly bms is not with active balancing ;this is standard bms ; that is all ;
Much to do about nothing. Look at the individual cell voltages of a battery using a Daly BMS after 6 months or a year. There is no significant drift. This is particularly true since we know that actual SOC varies by only a small amount, when the voltage is above 3.5 volts. I think these tests you try are interesting, but when you reach your conclusions, you still have to put it into perspective. If the highest cell is 3.60 and the lowest is 3.50 - 100ma deviation - the total state of charge is off by how much? 1 or 2 percent? Is this even worth your time? Can you say the Daly BMS is not working, if SOC is kept to within such a narrow range? Is the battery not delivering the power it should, especially if we are cycling it in the middle 80% of the total range in the first place? Yes, your tests are interesting, but not necessarily having a big impact on the usefulness of the battery, itself.
For what it's worth.... If your current signal is only 0.2 Amps, you could loop the wire through the sensor 10 times and the signal would be 10X stronger and would appear as 2.0 Amps
I have been using the Daly bms for over a year on two 48 volt banks of 280ah cells and they work perfectly, the balancing is slow but over time the difference is within a few milliamps. Now if I could only find a way to trigger a relay at a given soc, I would like to dump excess capacity to an electric water tank.
Hi Andy, I don't know why there was a confusion in the first place. Isn't passive balancing always bleeding off the higher voltage cells? Otherwise it will not make sense right. I dunno how your QUCC balancing works but I thought passive balancing has been always like that.
Andy, I’d be careful with the slogan “ Make
I just tested the balancing function on eve 280ah cells built into a 48v pack. My cells were factory OOB. The cells came to me around 50% and the first charge was crazy unbalanced (0.312v). However, I brought them down to 75% SOC and changed my Balanced Open Start Volt to 2.7 and Balanced open diff volt to .02. After just two cycles of 100% to 75%, these cells are pulling full capacity. No top balance required. Great Video!!!!
Hahaha... You absolute legend Andy!
Andy I have a 120A Blue tooth BMS that ballances the same way (Not Daly) - It balances 60mA but on 320ah cells it would take ages from newly assembled despite initial parrallel charging - To get round it I used my little T8 charger to do the initial charge - it balances as it charges up to 15watts - I disconected the BMS ballance leads as I charge so the two ballancing regimes did'nt conflict - The Battery was balanced perfectly with each cell 3.6V - I then disconected the balance leads and charge leads from the T8 then reconected the BMS balance leads and the battery has stayed in balance this past 6 month despite heavy use ( Her hairdryer). I concluded that my BMS can keep matched large cells ballanced in regular use but is too feeble to balance a freshly made up pack on its initial charge.
Thanks for taking the time to do the video. I was going back and forth with you about how my dumb Daly has been working flawlessly. I rarely see more than 5mv difference between cells. Oh I'm surprised you ended the video talking about using larger cells because I'm using 8 280ah cells and couldn't be happier with how perfect they stay balanced and protected.
Thanks Andy - great stuff! 👍
The good part about the Daly only balancing while charging is that you are never unnecessarily discharging your pack. Conversely the weakest point of the QUCC is that unless your pack stays balanced, you’re always balancing the cells above the balance start voltage (and thus discharging the pack slightly). Practically, this doesn’t really matter given 280Ah cells. Daly works well in any battery that is regularly being discharged and charged, but of course, having properly matched and top balanced cells is preferable. I do like the app for the QUCC - a good visual representation of the cells and balance function.
Hello from the high desert of New Mexico USA 🇺🇸. Hey Andy congrats on another great video, you really have become the G.O.A.T of solar power on RUclips. Keep up the good work and stay safe and charged
Hey Andy, on those cheap amp meters you can actually calibrate them with the small potentiometer on the back. One for voltage and one for the current
Great video. Thanks for all that great information.