Anyone questioning about these cells holding their voltage, this chart falls right in line with my testing. I was running a 5.5A load about 1/3-1/2 the time as the compressor kicked on and off. I started at 13.9V and it dropped to 13.4V in 2 hours. After that it stayed there for days, till it dropped to 12.8V six and a half days later. My test tracked this chart fairly well.Another RTFM moment. Below is a chart from the EVE 280Ah Product Spec PDF :
I thought I saw about 26.70V (3.337V cell) lingering for a while during my test for the upper plateau.
Maybe I'll do my next test with 26.4V to 25.2V (3.30V to 3.15V per cell) and see what the usage percentage would be. Seems to be a happy medium for an average C-rate.
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Hi SteveINFO for Australians / New Zealander's
I was in chat with Amy @ my 3:30AM and mentioned how several folks from down under are dismayed by S&H costs, they are shocking IMO... She said that this is not within their control as the various couriers set their rates. Now she did say, that shipping by Sea is much cheaper but can take longer for obvious reasons. If you really need them fast then your stuck but if time is no problem, Sea may be an option. I imagine this applies to everything coming out of China but these batteries being so heavy, it just plain & simply SUX.
Please click the report link on the posts that are attempting disruption and I will warn and remove them.ENOUGH Bull Hooey !
Asking Admins to lock this thread. Sorry that I started it, with the idea of helping folks and it's turned into maximus sillyus with a dose of idioticus.
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More assembly and config is being done with new tests and new relays etc but it won't be posted to this mess.
BTW: I'd like to thank those with POSITIVE & CONSTRCTIVE Contributions but this has gone of too far and the sidetracks & diversions have corrupted the usefulness of this thread. Maybe that was the point of the disruptors...
The sales staff are the ones informing us that these are EVE cells; I asked and they told me that.Where was the first post claiming they are Eve cells. That was page 31 of this thread. Y'all are making the fuss.
Where was it advertised, that you think you didn't receive what was advertised? Who has received defective merchandise?
I have not seen any place on Alibaba or XUBA claiming whose cells they are.
It's perfectly valid to raise claims of false advertising in this thread; even if it turns out to be incorrect. I can't understand why there has been hostility to our forum's detectives out there discovering stuff for us. To all of you researching this for me and others, thanks so much!Was that the reason you bought them?
So? How does previous ignorance on a procedure indicate invalid evidence being produced now?...IIRC, we had to walk you through just parallel balancing your cells.
Explain the scientific method you are using for your tests.
Excuse my ignorance, but I would have thought that a 9% variance in capacity on raw cells indicates a quality control problem. Lucky for you, you won (or your BMS is not calibrated right) someone else may not win. SO I'm really glad you shared that your cells are out of wack by 9% because that frankly scares me a bit about buying these.Is it the same method a lab uses when they make a report on them?
I know darn well I don't have the proper equipment to run the same tests a proper lab would run.
I do know that I input to my BMS I had a 280AH battery and after discharging it from 13.9V to 12.8V my BMS thinks it is a 308AH battery.
That is 10% over the claimed capacity and falls right inline with new cells built into a battery.
@LukeVader sure seems concerned about the quality. But hay, maybe if we make the environment hostile enough to those raising concerns about their cells, fewer will report problems right? Especially if their past ignorance on topics is gonna be thrown at them for daring to question the pristine glory of these cells.I think I have read just about every post in the 2 big threads on these cells. Eve or not was never a part of my decision to buy or not.
Other than a few receiving damaged cells, I don't think I have read any posts of someone unhappy with the quality what they got.
That would be fine, if the thread was about 280AH cells in general or with that sticker. This thread is about the 280AH cells sold by XUBA.Anyone sharing your experience about cells with the exact same little "authenticity sticker" as the Xuba cells please feel free to share your experience. Since Xuba did not manufacture these cells and the guys in Dunguan did not and they showed up at about the same time for sale... well.. if it walks like a duck, etc.
Maybe I'll file a -10% relevancy but if I were forced to bet all my worldly possessions, I'd bet they are from the same factory whoever that mysterious producer may be... once we have enough data and it turns out that only the "EVE" cells from other resellers are out of tolerance well then we'll know. As it stands now, only a small handful of people have posted their XUBA test resullts so the more the merrier if you have probably identical cells from another reseller. Please share people. I'm drooling waiting for more data to come in.
I apologize for adding to your regrets about this thread. Like most long threads on internet forums, they tend to wander and go off topic some after a certain size is reached. Most times they find their way back to on topic posts.This is becoming TEDIOUS. I STARTED THIS THREAD and have regretted it at times.
.....snip....
IF you still have doubts, then buy from another company, another brand like CALB, CATL, Winston, SinoPOLY and spend accordingly and stop complaining.
I think you missed the post addressing that these are likely the identical cells.That would be fine, if the thread was about 280AH cells in general or with that sticker. This thread is about the 280AH cells sold by XUBA.
So sounds totally reasonable @LukeVader 's hypothesis that they may be Eve cells that didn't meet spec. for some reason (which follows with @Sgt Raven 's getting out of spec results in his tests). That seems to be the best explanation to fit the data we have.This is becoming TEDIOUS. I STARTED THIS THREAD and have regretted it at times.
Bottom Line: Amy @ XUBA has worked done things for OUR GROUP HERE because I have worked with her to improve the offerings and reliability of the shipping and even talked her into the free busbars & screws ad more... although I will not advocate for individuals, I tried tat a couple of times and got crapped on for it... I'm JUST A MEMBER HERE and have no affiliations to anyone, company or anything.
I have absolutely NO REASON to believe these are anything other than NEW CELLS and that they are most likely Grade-A. Amy told me they are but then again she may not know what the company manager arranged when they bought the bulk cells. Remember these people buy thousands at a time, XUBA is a low overhead operation with small "retail" list and keeping their costs low and passing that on.
I am the one who Contacted EVE Corporate with pictures of the QR Codes and they indeed VERIFIED THAT THESE WERE EVE Cells. They got upset because I posted a QUOTED COPY of the confirmation email. Note that apparently this pissed off competitor vendors who are selling the same at higher markup (I have seen as high as 300% markup).
SO FAR, with what tests I have done and am doing, they live up to spec and are exactly what they are. I was going to post extended info on such BUT I've shied away from it as it will seemingly cause more drama that I have no interest in. I will post some results when I feel up to it and have the time. May & June are VERY BUSY times for me with more important things. Trees to fell, logs to cut, firewood to prep and land to clear plus plantings to get in.
In Summary:
People have bought thousands of these from Xuba now.
99.8% are happy wit the end result.
They are EVE Cells but EVE has to play an odd role because of the competing vendors (you really need to understand Chinese business operations and how they work internally).
IF you still have doubts, then buy from another company, another brand like CALB, CATL, Winston, SinoPOLY and spend accordingly and stop complaining.
I think you missed the point that this thread is about these cells sold by one seller, XUBA.I think you missed the post addressing that these are likely the identical cells.
What out of specs results? My cells preformed exactly like I would expect brand new cells to preform. They gave me about 10% above their rating, which is quite common for a newly built battery. Will has even said the same about some of the batteries he built for videos.So sounds totally reasonable @LukeVader 's hypothesis that they may be Eve cells that didn't meet spec. for some reason (which follows with @Sgt Raven 's getting out of spec results in his tests). That seems to be the best explanation to fit the data we have.
Our lockdown here ends (supposedly) in another week and I'm gonna buy some. I just hope I get cells like Sgt. Raven got!
I will be a HAPPY camper with 308 AH capacity. Please everyone keep reporting your findings without fear of data repression.
More data is better on these identical EVE 280's being sold by Xuba and a couple other vendors. I hope you won't be afraid to post here so we don't have to search multiple threads for the handful of people who are sharing capacity tests. Thanks everyone.
I think you missed the point that if Walmart sells some new kind of Duracell batteries, and K-mart sells them too, and I buy them at Walmart; it's absolutely germane to mention the identical product someone bought at K-mart. Are you like a shareholder in Xuba or something?I think you missed the point that this thread is about these cells sold by one seller, XUBA.
I have 32 of these cells due to arrive shortly. I will have one 24v set up like your most recent test (8S2P) and two others like your former tests (8 in Series). I really appreciate all of your data recording and time posting these tests in the forum. Question... Is there a particular top, bottom setting that you are using now...that you seem to prefer after all this, for your usage? It sounds like your office items usage is just about the pull we'll be putting on ours.Another real-world-like capacity test. A more desirable result this time.
8 Xuba 3.2V 280Ah cells (24V nominal) - Rated capacity 7,168Wh
Test Range
Upper limit: 27.15V (rested voltage)
Lower limit (under low C-rate load):
25.50V, 5,749Wh = 80% usable capacity
24.90V, 6,165Wh = 86% usable capacity
24.83V, 6,660Wh = 93% usable capacity
23.00V, 6,893Wh = 96% usable capacity
1st Pic - Test begins about 7:30am - Inverter off, rested 27.15V, reasonably balanced cells, zero'd Drok meter (right)
View attachment 11831
2nd Pic - Inverter powered on (left), uses about 40W on its own (no other loads), minor voltage drop
View attachment 11808
3rd Pic - I powered a bunch of stuff on - Coffee maker, refrigerator, desktop computer & monitors, stereo, osculating fan, TV & sound bar, laptop w/ docking station & monitors; All variously powered on & off throughout the day (also used the microwave for lunch & dinner).
Notice the voltage dropped from over 27V to less than 25V when the battery was mostly full. Over a 2V drop when putting a sizable load on the battery (1,830W or .25C rate). Something to keep in mind when setting the low-voltage alarm and low-voltage cut-off settings. When the battery capacity gets low and you're still wanting to use things like a microwave, toaster oven, coffee maker, window Air-conditioner, etc...., you may need to compensate using lower settings.
View attachment 11809
4th Pic - Reached 80% usable capacity at 25.5V under load
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5th Pic - Reached 86% usable capacity at 24.9V under load
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6th Pic - Reached over 92% at 24.87V under load
View attachment 11826
7th Pic - Inverter low-voltage alarm went off, I'd set it to 23.10V, battery went to just below 23V. I powered everything off. About 96% usable capacity. Test effectively ends about 10:30pm
Notice the voltage dropped from 24.87V to 22.95V in less than 30 minutes time with less than .1C discharge rate (<717W).
The lower limit dropped off quickly once below 24.8V.
View attachment 11827
8th Pic - Inverter is still on (no other loads). Notice the voltage bounces back to 23.5V after just a few minutes.
View attachment 11829
9th Pic - Inverter powered off, no load, voltage slowly leveling off
View attachment 11828
10th pic - 7:30am next morning, battery rested the whole night. Resting voltage leveled off at 24.2V.
So, from lower limit 23V under load to rested 24.2V in several hours time. Over a 1V rebound. Something to be aware of when using voltage as a general measure of the battery.
View attachment 11830
Yeah, but what does all this mean???
It appears the Xuba 280V LiFePO4 cells are working as expected (advertised), at least from my experience so far. After a number of various capacity tests and a learning-curve on my part, the cells seem to be working well for off-grid solar power usage (low C-rates).
One thing I'm not sure about is high C-rates. I haven't really tried rates much above .25C (<2kW). Mainly, because what I've been testing with is a power system temporarily put together, using 1 AWG cable with uncrimped lugs, stock bus bars, and a couple of 50ft extension cords and power strips. The seemingly significant voltage drop under higher loads could be because of my improvised setup (not very efficient).
For me, it looks like the cells are going to work for what I have planned (ie. hurricane season backup power & general DIY hobby use). I was aiming for 10kW potential usable power.
16 Xuba 3.2V 280Ah cells (24V nominal) - Rated capacity 14,336Wh
Rough (ball park) estimates:
14kW x 85% = 12kW Battery charged to about 85% capacity (range somewhere between 27.2V - 24V)
12kW x 85% = 10kW Efficiency & Inverter DC to AC conversion losses (average about 15% loss)
I think a reasonable balance between available usable power and good battery longevity.
Thanks Sgt Raven and Steve_S for the backup suggestions when making long posts. I did both, used a text editor and the disk icon (Save draft) feature. Didn't need them this time, but good peace-of-mind, though.
I wasn't required to show any form of ID. Amy just ran it and it went through fine.No neither of them will let you pay with PayPal even though it's written on their page. You have to go through the Alibaba payment system, which is a bit annoying as it'll automatically flag your card and you have to send in a photo of your id and the card.
Let's choose unity and kindness guys. Often times, it's just a tone or phrase choice that changes a good vibe to aggressive. The world has more than enough of that already. We are all interested in solar energy...that is, we want to behave differently to and healthier to our environment, than the majority. Let's be alert to do the same in our participation in this environment. I'm not reprimanding in saying any of this, not at all, just giving a reminder. Lord knows I need them all the time. Choose respect and kindness.I think you missed the point that if Walmart sells some new kind of Duracell batteries, and K-mart sells them too, and I buy them at Walmart; it's absolutely germane to mention the identical product someone bought at K-mart. Are you like a shareholder in Xuba or something?
I just don't understand all the negative emotion. We are consumers, the excess/offloaded EVE cells are a product. Why do we have to repress information, we aren't actually in China you know.
Exactly, let's stop scape-goating people in this thread for just reporting their findings. The more data the merrier; it's silly to make it personal. Finding possible issues with a product is not attacking those who found the deal or already bought it. Xuba is a company, not a cult. I think...Let's choose unity and kindness guys. Often times, it's just a tone or phrase choice that changes a good vibe to aggressive. The world has more than enough of that already. We are all interested in solar energy...that is, we want to behave differently to and healthier to our environment, than the majority. Let's be alert to do the same in our participation in this environment. I'm not reprimanding in saying any of this, not at all, just giving a reminder. Lord knows I need them all the time. Choose respect and kindness.
I'm still trying to figure out the particular top and bottom settings. The 27V - 25V range worked out really well in this last test. Seems like a nice Goldilocks range. But, it required regular attention as I had to set the solar charge controller (SCC) above 28V to maximize the amps (current) to charge the battery in a reasonable amount of time. So I was frequently checking and adjusting the SCC settings to finally get to a resting 27V.I have 32 of these cells due to arrive shortly. I will have one 24v set up like your most recent test (8S2P) and two others like your former tests (8 in Series). I really appreciate all of your data recording and time posting these tests in the forum. Question... Is there a particular top, bottom setting that you are using now...that you seem to prefer after all this, for your usage? It sounds like your office items usage is just about the pull we'll be putting on ours.