diy solar

diy solar

Luyuan / Amy - Type 66 & 71 in matched set?

My order data from Amy. Grade A matched cells. new "k" cell. seems good to me , but Im not a expert...
All over 280AH, All Voltage/IR's match up as they should at the points. This will give you a consistent 280AH with the full Working Voltage Range of 2.900-3.400+ Remember: Max Voltage Range is 2.5000-3.650Vpc while Nominal Voltage is 3.200 and working is defined as 3.000-3.400. Above 3.475 and below 2.875 are the Voltage Cliffs that represent about 5-7% of "gross capacity".
 
I've also inquired with Auditor at EVE to trace the serial numbers in question and advice of Specification # and Manufacturing Date.
ROFLMAO indeed. The EVE Auditor... what a notion. Pure Bilge.
23 Posts, mostly bashing and supporting pal HiVolt ... well... coincidences hahaha.... Smells like somethin...
 
I think I have explained it clearly to you, right? According to the matching standard of EVE, it is normal for the cell capacity difference in each group to be within 5.6AH.
Hi Amy - 5.6AH / 280AH = +/- %2.00 Probably a good idea to add this to the product specification pre-sales.

2 Questions:

1) Any idea how that compares to cell capacity ranges used by other Commercial ESS systems (Tesla Powerwall, EVE Mega, etc.) 2% vs. 1% vs ?

2) Did EVE reply to you yet to explain how batching could mix older Type 66 280AH cells with Type 71 ? The "280N" = Type 71.
a) related concern is customer ordering the "N" model and expecting the "N" model.

With my inquiry to EVE and your inquiry to EVE - hoping we can ascertain if the core is:

A) EVE serialization error - is the 66 an deviation from standard?
B) EVE documentation error - is the serialization document incorrect?
C) EVE batching error - did they batch an old lot into the new?
D) Luyuan Error or Action - was there capacity shortage and these 2 were the solution?
E) Other

My suggestion here is a DEDICATION to TRANSPARENCY to RESTORE and SUSTAIN TRUST. I'm unhappy at the prospect of 2x Type 66 cells (280) with an A-series manufacturing date (2020) mixed in with my Type 71 B-date (2021) cells when my order was 280N Factory Matched. Even if specs appear "matching" - I paid for a particular model. No one hopes more than I do - that there is a plausible explanation.

Suggest we use this as an opportunity to turn a BAD INTO A GOOD. To understand what happened. To provide clear specs for the products. To end the guesswork. And if errors/problems - to make remediation and amends to show trust. If we can do that-- this can be a WIN WIN for everyone.
 
Hi Amy - 5.6AH / 280AH = +/- %2.00 Probably a good idea to add this to the product specification pre-sales.
This is the kind of information I do agree should be published voluntarily by the people you are buying from. BUT, as an educated, experienced consumer when someone says "matched" the first thing that should come to mind is "what does matched mean?", and then you ask that question.

When a sales person says it gets better fuel economy than the competitors comparable model, you ask by how much, dont you? You dont just assume that it is going to get 5 MPG better do you? You have to ask.
 
First of all, I apologize deeply for some misunderstandings and unpleasantness caused to you by my work negligence.

1. About not replying in time:

Usually, after receiving customers' request for checking shipping, I will contact the logistics company immediately, but they usually do not reply to me in time, maybe two days, three days, or even a week. They may need to confirm the specific status of the order with their foreign agents, or they may be very busy. I will reply to customers only after I get their reply.

I receive many messages every day, and it is very likely that I missed some messages that did not respond in time. When the customer contacted me for the second time, I just found that I did not respond to his first message in time. This is my work negligence and fault, sorry again.Hope I could do better in future, thanks so much for all customers' understanding and tolerance!

2. About "66" and "71"

In fact, I really rarely pay attention to these serial numbers. I pay more attention to their test data, such as the capacity difference, the internal resistance difference, and the consistency of the voltage.

So, I was very confused when you mentioned these to me today. But I quickly understood the problem you mentioned.

I checked all the test data of the batteries ordered in the last six months from EVE, in fact, they are all "66", only July is "71" (if you need, I can provide screenshots of all the test data) I contacted EVE Sales, they replied:

This is exactly the same battery, just the serial number is different.

What you understand "66" is the specification code of the old version with M6 thread,and it is a product of 2019. This is inaccurate. About this, you could contact EVE directly. In fact, I also hope that you could contact EVE. , Their explanation will be more professional.

You can confirm with EVE:

(1) Does Lu Yuan order grade A batteries from EVE?

(2) Does Luyuan require EVE to match each batch of batteries, at first 16 batteries as a group, later 500pcs in a group.

(3) Is "66" only the specification code of the old version (with M6 thread)? Has it been discontinued after 2019?

(4) After receiving these batteries, please test them, I guarantee here: If they are not matched, Luyuan will take the responsibility!

3. For commercial batteries, yes, matching requires additional costs;

For real grade A batteries, it is included in the price.

4. About the price of EVE you mentioned is much higher, you could check that via their Alibaba store.

In fact, our profits are much less than you think. We just hope that more and more people can accept real grade A batteries.

If you have any other questions, you could contact me through Alibaba or here.

Kind regards,

Amy

Thank you. Details are much appreciated Amy. I'm awaiting a reply from EVE still.

RE: TYPING: The comments above would require that (EVE) Specification PDF is incorrect re: 66 vs 71 (published by EVE 12/22/2019 saying N is 71). Are saying that ? or is EVE saying - old 280 and 280N are so similar - why does this customer care about the part # ?

RE: MANUFACTURING DATES: I would like to see the Manufacturing Date spread between the 2x Type 66 and 2x Type 71. According to EVE PDF specification - my serials would have a 1-year+ spread. Did EVE provide you with Manufacturing Dates?

I certainly hope we can get to the bottom of this for my benefit, your benefit, and this community's benefit.
 
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I like that this happens on public forum because small people need to learn about battery every day to catch up to the future. I still am planning on asking Lu Yuan first if get to large cell scale project.

Go Lu Yuan! Thank you for working with battery manufacturers to enable powerful DIY Energy Storage Systems.

Grateful for everyone seeking knowledge here.

I am still learning what questions to even ask when building systems. Thank you all for asking questions and learning.
 
My order data from Amy. Grade A matched cells. new "k" cell. seems good to me , but Im not a expert...
Still wondering what makes them matched? not the Ah as that is from 288 to 292. It still makes me wonder what "matching" is going on as that just seems like a random list of cells. Of my last 8, all were 291 but a 289 and they are going to exchange it so they are all 291.
 
Still wondering what makes them matched? not the Ah as that is from 288 to 292. It still makes me wonder what "matching" is going on as that just seems like a random list of cells. Of my last 8, all were 291 but a 289 and they are going to exchange it so they are all 291.
May I ask who 'They' is?
 
So .... are you saying that Basen is going to guarantee matching the cells within a capacity of .36%?
Second time you tried putting words in my mouth. I never said that, I don't represent Basen so I don't speak for them.
 
Second time you tried putting words in my mouth. I never said that, I don't represent Basen so I don't speak for them.
You said that they are going to make sure they are all exactly 291 AH .... which is within 1 ah .... I just did the math for you.
 
You said that they are going to make sure they are all exactly 291 AH .... which is within 1 ah .... I just did the math for you.
I didn't use the word "exactly"....do you always twist people's words to fit your own narrative? Secondly, what agreement I make with a vendor is between that vendor and me. You and everyone else should reach their own agreement with sales.

Even if I don't return and replace the 289ah cell, a spread of 289>291 is better than the 5 Ah spread others are getting, not to mention a mixture of model numbers.
 
I didn't use the word "exactly"....do you always twist people's words to fit your own narrative? Secondly, what agreement I make with a vendor is between that vendor and me. You and everyone else should reach their own agreement with sales.

Even if I don't return and replace the 289ah cell, a spread of 289>291 is better than the 5 Ah spread others are getting, not to mention a mixture of model numbers.
Well .... You did say they were going to make sure they were all 191 AH.

It would be nice if someone besides AMY developed a track record of making sure we are REALLY getting grade A cells when they say they are .... So, I'm all for it if they do. The competition would be good for the forum.

I just don't like it when other things are mischaracterized.
 
As far as we know EVE stopped production of the LF280N and started production of the LF280K. I am not sure of the exact dates but the reply you received from Amy was the end of June according to your screenshot. When did Amy start selling the LF280K?

Apparently the end of July.


As far as what your pending order shows, clarification is needed from Amy. I don't know why N's and K's can't be mixed but the terminals on the K's are closer to the edge, and I think the K has a slightly higher height. I think EVE would be the best source to find out if the K and the N can be mixed.

Please keep us updated. It's great you are trying to get to the bottom of this so others can be cautious at this point. If paying a premium I sure want to know exactly what I am getting and expect matched cells by model number and capacity.

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 Amy.
Those spreadsheets Amy sends links to are made by Eve, so they might be to blame. As far as I know, the 66 series was last manufactured sometime around July of 2020. I will also add I own 16 of the "66" series I purchased from Amy when she worked at Xuba (received October 31, 2020). I purchased 8 of the grade A matched cells from Amy in April of this year (105AH) and tested them for myself, and they are exactly as advertised. I used a ZKETECH EBC-A40L to test, 40 amp charge and discharge.
 
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I didn't use the word "exactly"....do you always twist people's words to fit your own narrative?
Lets relax a bit. You have implied you expect all of your cells to have 291ah capacity. To me it means you are implying you expect each of your cells to be exactly 291ah's capacity. Of course that's not possible. The replacement cell could be 291.003ah's capacity or 290.999ah's capacity.

If I received 7 cells with 291ah capacity and 1 with 289ah capacity I would be elated. But that's me. Everyone has their own tolerances and expectations. I hope you will take the time to capacity test your cells. I wonder if the capacity of each cell will drift a bit after the cells are run through a few cycles?

Secondly, what agreement I make with a vendor is between that vendor and me. You and everyone else should reach their own agreement with sales.
You just made your agreement public. Thankyou for sharing. I think we can all learn from agreements others make with suppliers. Hopefully Basen will hold up their end of the agreement and you will receive cells that are all exactly 291ah's...lol.

Even if I don't return and replace the 289ah cell, a spread of 289>291 is better than the 5 Ah spread others are getting, not to mention a mixture of model numbers.
True and the mismatch of the model numbers concerns me more than the capacity mismatch.
 
Lets relax a bit. You have implied you expect all of your cells to have 291ah capacity. To me it means you are implying you expect each of your cells to be exactly 291ah's capacity. Of course that's not possible. The replacement cell could be 291.003ah's capacity or 290.999ah's capacity.

If the IR match, less than 5AH capacity won't make a real difference in a pack of 280AH cells. They will all hit full and empty pretty close together, just my experience.

I wonder if the capacity of each cell will drift a bit after the cells are run through a few cycles?

I've tested extensively, capacity drifts mainly with the temperature.
True and the mismatch of the model numbers concerns me more than the capacity mismatch.

That is what I'm most curious about. A couple of amp-hours in capacity difference is not a concern, of my 16 cells, two measured 268AH, the remainder measured 274-281. They perform well at low C rates, I wouldn't expect a 1C rate to be as nice.
 
I've tested extensively, capacity drifts mainly with the temperature.
Right but what I was getting at is if all the cells come with 291ah's capacity, and are run through a few cycles, will the capacity of the cells remain relatively close to each other? I know the capacity of all the cells will drop some.

I didn't capacity test all of my 8 cells. My weakest cell when I received them was 272ah's. I too have run them with low C rates and they perform well.
 
Lets relax a bit. You have implied you expect all of your cells to have 291ah capacity. To me it means you are implying you expect each of your cells to be exactly 291ah's capacity. Of course that's not possible. The replacement cell could be 291.003ah's capacity or 290.999ah's capacity.
For sake of the discussion, when I say 291, I mean 291.000 to 291.999.

If I received 7 cells with 291ah capacity and 1 with 289ah capacity I would be elated. But that's me. Everyone has their own tolerances and expectations. I hope you will take the time to capacity test your cells. I wonder if the capacity of each cell will drift a bit after the cells are run through a few cycles?
If you know the shipper has 180 291s and 20 of something else, it seems they could "match" the 291s and put the non-291s with other non-291s. It was just a commentary on what they could have easily done. Just saying..
You just made your agreement public. Thankyou for sharing. I think we can all learn from agreements others make with suppliers. Hopefully Basen will hold up their end of the agreement and you will receive cells that are all exactly 291ah's...lol.
Basen has already told me they would swap the cell. You guys make it sound unnecessary. BTW, my load tester came in today. I am charging the 289 to 3.65v and then will load test it. Due to my ineptness, you will likely hear me saying I blew something up.
True and the mismatch of the model numbers concerns me more than the capacity mismatch.
Glad we can agree on that part. At least I got all the same model number, date codes ACD-ACG, and within a couple Ah. With the 2.89 thrown in, my 8 cells have a spread of 2.63 Ah. Take that odd cell out, my spread is .63 Ah.

Bar CodeAhVmohmV2mohm2v3mohm3GearCase NumberPallet Number
02YCB66723300JAC60001482289.29623.3030.133.3020.133.2950.13T33gQ7S202106240182ZB20210624010
02YCB66718300JACD0005285291.29223.3020.133.3010.133.2950.13T33gQ7S202106240665ZB20210624098
02YCB66728400JACF0002908291.36983.3020.133.3010.133.2950.13T33gQ7S202106240661ZB20210624098
02YCB66728400JACG0021878291.59553.3020.133.3010.133.2950.13T33gQ7S202106240658ZB20210624098
02YCB66718300JACD0005265291.85993.3020.133.3010.133.2950.13T33gQ7S202106240684ZB20210624098
02YCB66718300JACD0005047291.88733.3020.133.3010.133.2950.13T33gQ7S202106240661ZB20210624098
02YCB66718300JACD0005245291.89883.3020.123.3010.143.2950.13T33gQ7S202106240665ZB20210624098
02YCB66718300JACD0005054291.92213.3020.133.3010.143.2950.13T33gQ7S202106240684ZB20210624098

There is also a Group number after Pallet Number but I didn't note them. I was given this info for the whole 2000 cell order. Of the 2000, 200 were sent to the US of which I received 8.

Thanks guys!

BTW, does Gear T33G mean anything to you guys? Is that the test gear model?

 
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