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Which Daly BMS do you have? 12v "Smart" BMS: 24v "Smart" BMS lightboard: For the 12v model, you can easily make a reset button: https://smile.amazon.com/gp/product/B08HQQ8HV1/ https://smile.amazon.com/gp/product/B0813871PH/ For the 24v model...

Just an update since I now have a PC hooked up for data logging (was running some tests manually since my laptop battery wouldn't last long enough, and didn't want to move a full PC into the garage). Just like @Off-Grid-Garage , I find the software quite easy to use, and wanted to post an...

My bet is 16 cell phone batteries measuring 3200 milliamp hours.

Quite possible, but I will point out that vendors suddenly going downhill is a thing in this industry. Ask Will Prowse about a vendor that shipped him great cells, and then a few months later started sending everyone garbage after Will recommended them. Then we have Michael B Caro. Like I...

I ordered one last night. I really like the connectors for the current, plus you can get it with an interface for a heating element. Currently 12v only. https://www.aliexpress.com/item/1005002958135242.html

His original post: Basically, he got a "bait and switch" with no notice that a substitution was made until he received the cells. He certainly indicates he attempted to resolve the problem. It sounds like he wasn't happy with their response. Seriously, what's with the attitude towards any...

Overkill (and the JBD it is based on) are pretty solid, and accurately rated. In other words, if they say 100 amps, you can pretty much draw 100 amps for 8 hours, many other brands are not accurately rated. As Steve mentioned, you need to order at least a 200 amp (preferably 250 amp) Daly to get...

I think quite differently. If the Chinese government doesn't think the cells are safe to use in a vehicle, I don't want them.

As an IT nerd with 40+ years experience, I endorse Luyuan. So there. Very shortly (once capacity testing is done) I will be posting a review of the Eve 304 AH cells sourced from Amy. They take a while to capacity test, but I will say the results are in line with "you get what you pay for".

A bad idea. The threads should not be carrying any current, the current should flow between the busbar or lug and the terminal face, any other path is not what it is designed for. Adding anything to the threads could also make it difficult to obtain the correct torque, and actually be counter...

These have worked very well for me: Ring Terminals 1/4" Red 22-16 AWG - Heat Shrink Wire Connector Crimping actually gives a great connection, just ohm them out to make sure, then give a strong tug on the connector to make sure it is crimped well. If you don't have a crimp tool, I can see...

OK, took apart my "lightboard" for my Daly 8 cell, "smart" BMS (no fan), and as I suspected the switch is directly connected to two pins on the connector that plugs into the BMS. It is normally open, and when depressed is closed until released. The other side of the lightboard has no...

For a short time Amy had problems getting the test reports from Eve, and was shipping cells without them. That problem is resolved. Her grade A cells really are grade A (matched in sets of up to 16), including test reports (or at least mine came with them). I verified mine, I can't speak for...

My take (and it's worth what you paid for it, nothing): EVE changed formulation (or something) and claims 6,000 cycles on their 280AH cells, that previously had been rated for 3,000 cycles. Lots of people bought their newer 280K cells and reported not meeting amp hour capacity tests, even the...

The main positive and negative cables don't get hot, but everything connected to the fuse/busbar does? I can tell you where I would start looking for a poor crimp, or bad connection.

Yes, Will doesn't even want you to link to his monetized tools and equipment links. I have used his links personally for some tools and equipment, because it costs me nothing and helps Will keep the forum running. I ran a BBS in the 1980s and 90s, so I understand this forum really takes a LOT...

This video is a perfect example of why you shouldn't charge as a pack without a BMS, and why you should resist the urge to crank up the voltage to speed up parallel top balancing! Sorry, not directed at you, but it very clearly shows how things will sit there with little or no change for days...

I can't speak with authority for how these cells are actually used in China, but my understanding is the large ones are used in vehicles like a bus. They are compressed in a fixture (limiting movement of terminals in 3 directions), and welded busbars are used. All that is really needed for a...

8 in series and 8 parallel means you have 64 panels. How is it really connected? I suspect you mean 8 parallel sets of 2 in series. But accuracy is important if you want help. The used 250 watt panels at SanTan have the specs: Open circuit voltage (VOC): 37.6 V Max power voltage (VMP): 30.3 V...

Update on some capacity testing. First value is 10 amp discharge rate using the cheap $30 tester. Second value is using an electronic load (ET5410) at 20 amps discharge. Third value is using an electronic load (ET5410) at 40 amps discharge . Be aware, the 10 amp test represent 28 hours testing...

That will certainly encourage anyone new and reporting problems. What I see is a user who joined on February 3rd. He made one post, reporting a problem. It certainly seems possible he looked in February and ordered from a vendor that had so far had no bad reports. He then received the cells...

I have tested extensively, and 3.45v is indeed the magic number. If you charge to 3.45v, and allow current to taper, you are over 99% SOC. Also, from a capacity standpoint, discharging below 3.0v is not useful, and it causes a significant temperature rise in the cell. I have played with charge...

There are reliable and honest vendors, but everyone chases the lowest price. I understand the allure of cheap cells, but I will pay the 25 to 30 percent more for the sure thing grade A cells packaged well. I will also add that everything I have seen up to now has indicated that Michael was...

I'm starting this thread to help people figure out some of the most common Daly BMS problems. Please feel free to add additional solutions. First I'm going to copy a post I've already made, with some additions. 12v "Smart" BMS: 24v "Smart" BMS lightboard: For the 12v model, you can...

This!

The same cell I posted earlier today, and I had just gotten almost exactly 280AH out of a day or two ago (as measured by the $30 tester), it's just about to shut itself off:

Aluminum will oxidize quickly and invisibly, right after cleaning I would recommend applying an anti-oxidant compound. People get carried away and think more is better, but a very thin coating works best. Just apply it and wipe it off with your finger, should be pretty much invisible but you can...

That would be accurate. What they understand is credit card companies reversing charges.

I can confirm, it is a single port BMS and is accurately rated. I haven't tested it above a 40 amp charge rate, but it does seem it will.

I can tell you for a fact that anything over 30 volts is dangerous. Dispute with "internet experts" quotes at your own risk. My knowledge might date to the 1970s and earlier, but it hasn't changed.

Well, you could. Unless you have a fireproof room to place them in, I personally wouldn't want to live in the house. There is a reason most people use lithium iron phosphate chemistry, and that reason is fire.

Certainly, I strongly recommend the Riden RD6018, 18 amps output: https://www.aliexpress.com/item/1005002058172206.html I could also recommend the Tekpower 40 amp supply, except there is a new version I haven't tested yet. I bought the one I have on Amazon (15v, 40a) but they no longer sell...

Victron is a legitimate company that must adhere to the (much more strict) privacy data restrictions of the European union (not the "whatever, you agreed to, it's fair game what we do with it" like North America). All others are based in China. Believe, don't believe, argue, blame, whatever you...

Those alligator clips in the video really are the best set included with the cheap 10 amp supplies. All of the others I've seen are really garbage. I would clip the leads to the busbars where you get a much better connection, rather than the stainless steel grubscrews.

I personally have seen a few million boards of various types, and diagnosed their problems. Seriously, I worked in the test engineering lab where (starting in 1981) we manufactured 30,000 boards per week (the original IBM PC) for the 5 years I was there. We were a contract company, i.e. we...

This is good advice. ?

The cells don't look swollen to me, all of the high capacity cells undulate on the large sides because the aluminum is thin. That said, if you want real grade A cells complete with factory testing results, there is a vendor that sells them for $121 each, plus shipping. You get what you pay for...

My understanding is that one terminal stood up farther than the rest, and was physically pressed into the cell when he stood or sat on them the previous day. Seems likely, I doubt they have a lot of structural integrity to support significant weight placed on a single terminal.

No question is silly. Yes, same procedure, just use the positive and negative on the single cell. I wouldn't go below .1 amps to be honest, that's plenty. As a group of four, 1 amp is plenty low enough too. Those power supplies are not the best for stability, so verify voltage first before...

I managed to buy an EBC-A40L. I say managed, because apparently I got a bargain price, $173.63 off Aliexpress. Good luck finding it for that now. https://www.aliexpress.com/item/1005001971982159.html?spm=a2g0s.9042311.0.0.7e074c4d7VEoFR They raised the price and raised shipping by quite a bit...

What it looked like to me (I wasn't there, just observation). The first puncture shorted the cell internally and the heat started the electrolyte boiling. The second puncture seemed to let in just enough oxygen to let the boiling electrolyte ignite due to the heat of the short. The flame was the...

Ok, bluetooth is the root of all evil here. Newer low power bluetooth spec calls location services. It wants to know how far you are from the device to adjust power. Storage locations, media access, etc. This is asking to be able to store configuration data, like what voltage you want to...

I should also point out that every single grade A cell I own (32 total) measured above their rated amp hours (as well as watt hours). Using the same (or close enough) testing methodology as Ray.

Notes on the DL24P tester: The diodes (not the MOSFET) on this get VERY hot running at 20 amps, so I thought I'd show how hot, and how I measured. Please note that somewhere between 10 and 15 amps is a safe current to run this (and similar testers). First, the DL24P tester I linked above has...

Yes, the electrolyte is a hydrocarbon. It boils if you get it hot enough (like bloated cells from over charging). An excellent way to start a fire is to get something hot enough in a hydrocarbon vapor environment (diesel and gas engines come to mind). Punching a hole in cells will frequently...

An active balancer left on during charge/discharge can actually unbalance your cells. Top balance once and be done with it, if the cells are decent quality the limited balance current supplied by the BMS is adequate to keep them in balance. FYI, you need a 16 cell active balancer, they are...

At full output, the RD6018 is capable of 1080 watts (60 volts X 18 amps = 1080 watts). The instructions for the 1000 watt supply say that for 110 volt operation to set the power limit to 950 watts since apparently it isn't capable of outputting the full 1000 watts except on 220 volts. I have...

That happens a lot with cheap Chinese breakers. I use a high quality USA made breaker and I've never had a problem. You get what you pay for, and with breakers, don't scrimp, it's dangerous. If they have what you need in stock, here is where I got mine...

I can't speak for everyone, but my Kunkin has a calibration certificate from January 2021. I know, old thread. I'll say this much, if the vendor advertises "grade A" cells, then EVERY SINGLE CELL should meet or exceed their capacity rating. That is what grade A means, it doesn't mean they...

You buy grade A, you pay for grade A. She also sales bulk cells (that everyone else labels as grade A). https://diysolarforum.com/threads/introducing-the-new-improved-shenzhen-luyuan-technology-co.15880/

We call that a "yard" in Arizona.

Apparently the end of July. https://diysolarforum.com/threads/introducing-the-new-improved-shenzhen-luyuan-technology-co.15880/post-307591 The spec sheet does show the N are 4mm taller. I'm interested in the outcome, however, I suspect any mixup isn't intentional and will be made good by...

This sounds like the scam they were doing earlier where fake tracking is hacked into the system. The tracking will show delivered, you get nothing, and Aliexpress or Alibaba goes by tracking and releases the money to the scammer. You should warn your credit card company now. In the past, they...

Old thread, I know, but since you mentioned this....... I've been keeping track, on my 280AH Eve cells, 2 degree C rise, until the last 40 amp hours or so, then a 5 degree C rise above ambient.

I just use pure isopropyl alcohol and a felt pad on a Dremel tool. Seems to work well.

The body has resistance to current flow. More than 99% of the body's resistance to electric current flow is at the skin. Resistance is measured in ohms. A calloused, dry hand may have more than 100,000 Ω because of a thick outer layer of dead cells in the stratum corneum. The internal body...

No. Do not discharge below 2.5v. The cell temperature will rise, I suspect over discharge is where most bloated cells come from. From 3.65v to 3.1v, 2 degree Celsius temperature rise, from 3.1v to 2.5v, 5 degree rise for me. VERY consistent.

EVE tests them for Luyan. Luyan supplies the packing materials and shipping labels, EVE matches the cells and puts them in the boxes, done after you have ordered. This is why it may take a week to 10 days after you've placed the order to when they send you the link to download the test reports...

I agree, the value of many "not grade A" cells is superior for our use cases. As long as they are not used and abused cells, they are very good for our use case (low C rates). The true grade A cells are intended for things like buses and cars, where high C rates and matching cell curves are...

Probably shorter and easier to understand for you: Breakers are more likely to fail. Fuses can too, but the chances of a fuse failing is much more remote than a breaker. Lithium batteries have an insane amount of current they can present if shorted. In many cases, just that amount of current...

No, I am sure they are not. But to me, the pressure relief valve should be on the top. I decided before anyone complained about leaking cells that I would keep mine upright. Likely that the electrolyte coverage is also better in that position.

Wow, you've obviously not worked with telecom equipment. I'll continue to follow the instructions of my first electronics instructor, treat anything above 30 volts as deadly. Even if he was an ex-nazi, he knows what he was talking about. High current is indeed dangerous, I have personally...

Uni-T has a very good reputation, unlike most cheap Chinese brands.

The balance ability is very limited. I strongly recommend you top balance first, then it won't have any problems keeping them in balance.

Yes, unfortunately any comment he makes opens him up to legal liability problems for something that *I think* is not really his fault, and couldn't really be foreseen. Certainly I wouldn't expect the cells to leak, the manufacturer of the cells says the orientation is perfectly acceptable, etc...

Yes, I really wish he hadn't put that in there. I'm pretty sure everyone says "but I'm not a beginner". Especially if they aren't watching it closely and just half listening, and thus miss the warning.

All I can say without confusing you is that those cells are where you expect them to be after 24 hours. Cell 1, definitely try again. I know advice given can be confusing, but it is all good advice.

I've been using the EBC-A40L since March, it is a great value if you need to test cells since it combines 40 amp charge and discharge along with data acquisition. In total I have 7 different brands/makes of capacity testers, this is the one you should get if you want to verify the capacity of...

I hope (but have no real insights) that this will change in the next 18 months or so. The Tesla 4680 cell is world class, and the Fremont production line is working out the kinks for Texas and Berlin (as well as Shanghai). Instead of chasing short term profits, the man in charge is chasing long...

I paid with a virtual card number from Citi. Went straight through, everytime. A lot of people report having to send copies of their ID, that's why I recommend the virtual number. I just wanted to remind everyone (once again), Amy does have a deal for forum members. Please use this code...

My root cause was a cat hair, they get everywhere.

Lots of questions, but you have provided few details. What are the cell readings from your BMS? What are the low cell voltage disconnect and high cell voltage disconnect set to in the BMS? I have no clue what a "UPS type grid type battery charger" is or means. Does it have a LiFePO4 setting...

I compared results of multiple testers (including the ZKE-40, and an identical tester like yours from Amazon, and even cheaper versions without voltage sense leads) with TWO calibrated loads. Even the cheap testers are much more accurate than you would think given the price. Hard to be 100%...

Yes, it is a magic number in binary. If you enter an arbitrary number, you will get arbitrary results. Basically it is the largest number that the variable can store. 65535 occurs frequently in the field of computing because it is {\displaystyle 2^{16}-1} (one less than 2 to the 16th power)...

My experience doing it both ways is that results are identical (provided the power source has adequate voltage control). Parallel top balance vs individual cell charging to a specific voltage works just fine with my Riden supply. I can discern no difference in the results.

Just as an FYI, 3.65v is to do a top balance. You should not aim for 3.65v during a "standard" charge (which will drop to 3.4v range within an hour). Don't charge to 3.65v and leave them. A few days, no problem. A few weeks in high temperatures, you will shorten cell life. 108 here, much nicer...

Yes, the 2.7v is very low. Much lower than recommended storage voltage, it doesn't drop that low from shipping, the cells were discharged and shipped that way. If the vendor is telling you 3.7v is normal, then the vendor doesn't know what they are talking about...

I suggest something like Anderson connectors to plug in a charger this time. Much better than alligator clips.

Looks like he is saying "we shipped it in a foam box (they do) and the shipper should take responsibility for their mix up". Indeed, looks like RD sent what you ordered, Ali messed it up and doesn't want to take the blame (and eat the cost). No reason why RD should eat the cost, they didn't...

Correct, watch the video Will made about it, and you can see the cell orientation. Essentially, lay the battery pack on it's back. Cell orientation: Leaking from the pressure valve: The proper way to orient the battery packs if they are not leaking: Personally, if I had bought one and...

That's how I found where to purchase too. (After watching Will's videos). I read that LFP was 98% efficient, and didn't believe it. Google lead me to Will, and Will had a forum. Now my personal extensive testing is showing closer to 99% efficiency. Will's videos and forum are both great resources.

I posted this in the tools section where it belongs, but I want to let beginners know about it, so I'll link to it here: https://diysolarforum.com/threads/cheap-power-supply-for-top-balancing-tested-and-works-well.19846/ Please note, the Long Wei come with the best alligator clips I've seen on...

Ok, I hate to say it, but which part is the common sense part? The ebay description, the manufacturer description, or the pictures on both with 8 gauge wires and 50 amp rated anderson connectors. You guys jump right to "John has no clue, use common sense". All I did was point things out that...

I've tested Daly, JBD and JK BMS pretty extensively. I've found the JBD to be the single brand that actually lives up to their rated claims the best, without smoking things if suddenly shut down. Daly would be the one that is least honest, and has very poor quality control. I haven't tested it...

Grade A cells and bulk cells are priced quite differently. The true grade A cells Amy carries are indeed higher priced. They are also manufactured after you order, or at least within a week or so (spec sheet says to get full capacity, you must test within 5 months of manufacture). They come with...

Yes, if the video is just them using a meter to measure cell voltages and IR, it's not really a test. As Steve posted above, Eve will send a test report for the batch of cells (including serial numbers) that Eve has used to match the cells. Bulk cells are a great value, you get more storage for...

If you are doing a large number of cells, best to use a BMS and charge until high voltage disconnect on a cell. Then it will be much faster charging each cell on the tester, discharging for the capacity test, and then you can either charge each cell to a storage voltage on the tester or use...

Just as an FYI, JBD now has a 200 amp rated BMS that looks quite promising. I have ordered one to test, so far I have found the JBD brand to be accurately rated and trouble free. I have had no problems with the Daly that I own, but many here have.

Apparently all the 280 cells test low. The 304AH cells all test high. I am not sure why, other than EVE supposedly optimized the chemistry of the 280s for cycle life rather than capacity. The size difference (aprox 2mm taller for the 304) should not make such a large difference, so I tend to...

One of the reasons I dumped my Daly, never showed anything but zero cycle count. I finally figured out that even though I selected and purchased an LFP BMS, it was set to not count as "full" until above 3.9v (or something like that). In other words, they took a BMS for a different chemistry and...

When you think about it, 57 days via slow boat from China isn't that bad during the Christmas rush. About two weeks longer than normal I think.

The design is intended to use as little power as possible, and prevent charging below a set temperature. Since discharge is really not affected by temperature, it doesn't turn on the heater unless the cells are below the set temperature and there is a charging current. The theory being that when...

You just answered your own question about why the top balance didn't work, it's because you didn't top balance. I'm not sure who told you that would balance your cells, but as you can see, you were given incorrect information. This procedure works, every single time, and is very safe as long as...

You are correct, that will work. I would attempt to order a couple of 24v BMS instead, you will be happier in the long run. When placed in series packs can get out of balance, although with matched cells that isn't likely. JBD does make some excellent 150 amp and 200 amp rated BMS for 12v packs...

https://www.aliexpress.com/item/1005002958135242.html There you go. I noticed the reviews start in August, and I hadn't seen it before. I ordered the model with the "heater" interface, just to test and see how it works. JBD seems to listen, once their maximum rated BMS was 100 amp, then 120...

About M6 or 1/4 inch. Just a tiny bit bigger than an M6 screw.

This is true, along with checking connections. Twice now I have found a connection problem by looking at the connection on "runner" cells.

Will has some recommendations for all in one systems you should look at. https://www.mobile-solarpower.com/all-in-one-122448v-packages.html LiFePO4 batteries are popular here for safety reasons. Lithium battery chemistries are not all equal. They are also relatively cheap, and high density...

You want to have the inverter stop before the BMS decides to protect the battery. Since you are asking about inverter shut off, unless you are using something else to trigger turning off the inverter, the inverter can only read the voltage at its own battery terminals. I for one can't answer...