Docan Power bad experience, beware.

[wepower]

I am going to get MB31 cells. These are just new from this year and I think way less chance you get faked or Bgrade or something. I got MB30's in July and they seem fine (from QSO, EU warehouse).

Why do you think so? MB models are new, so chances they have some production problems are higher compared to mature models, it can lead to a big quantity of B-grade MB cells on the market, sold through Docan, QSO, Basen etc etc.
I saw LF280K V3 cells with LF304 code relasered over the old code, why couldn't sneaky resellers print new fashionable MB code on top of the same LF280K B-grade? For you to buy MB cells from EU warehouse in July they had to be produced in April-May. And as far as I know at that time MB series was not in commercial production yet.
According to my EVE rep (I am only buying directly from the manufacturer since that Docan scam) this year LF280K continues to be their main ESS model and better to wait until 2025 when new MB cells become mainstream.
Can you share pictures of your MB cells purchased from QSO? What terminals do they have? Are you sure QR code was not altered?

 

[Alkaline]

wepower is correct, a lot of current cells floating around are engineering samples and not meant for sale, they may or may not have valid qr codes BUT highly unlikely they do not have production test reports.

ALTHOUGH, there are some reports that the MB31 has some belly action going on so beware, best to stick with the mature models.

Remember it took eve 3 tries to get the 280K correct and from what I hear the 304 is also a version 2 (even though I don't think the v1 had issues?). Who is to say in next 6 months the MB31-V2 or MB32 won't be out to replace it.

 

[prosier]

Why do you think so? MB models are new, so chances they have some production problems are higher compared to mature models, it can lead to a big quantity of B-grade MB cells on the market, sold through Docan, QSO, Basen etc etc.
I saw LF280K V3 cells with LF304 code relasered over the old code, why couldn't sneaky resellers print new fashionable MB code on top of the same LF280K B-grade? For you to buy MB cells from EU warehouse in July they had to be produced in April-May. And as far as I know at that time MB series was not in commercial production yet.
According to my EVE rep (I am only buying directly from the manufacturer since that Docan scam) this year LF280K continues to be their main ESS model and better to wait until 2025 when new MB cells become mainstream.
Can you share pictures of your MB cells purchased from QSO? What terminals do they have? Are you sure QR code was not altered?

MB series is the refined version of LF v3. Its not a new model, there should be less issues. Anyway it's my view on it. Ill pick MB prior to the older series.
LF304 is not MB series. MB30 = 306 !
MB31 = 314 !

My QSO ones (MB30's) are validated QR on the Gobel site yes;

 

[wepower]

LF304 is not MB series. MB30 = 306 !

I know, it was just an example of what you can get from resellers.

My QSO ones (MB30's) are validated QR on the Gobel site yes;
View attachment 244525

Don't want to bring bad news to you but QR code area looks sanded. You can clearly see different color and texture under the code and near the valve. Of course picture with black cover removed will be more informative.
Production date is Feb 2024. When I tried to order MB cells from EVE in April they said MB series was in preproduction stage.

View attachment 244527

And EVE does not offer cells with welded studs.

 

[prosier]

I know, it was just an example of what you can get from resellers.

Don't want to bring bad news to you but QR code area looks sanded. You can clearly see different color and texture under the code and near the valve. Of course picture with black cover removed will be more informative.
Production date is Feb 2024. When I tried to order MB cells from EVE in April they said MB series was in preproduction stage.

And EVE does not offer cells with welded studs.

I have checked my batches of mb30 and mb31 and to me it all looks fine, no sanding or anything;

 

[wepower]

These look different compared to your first photo. No visible signs of sanding.

 

[42OhmsPA]

To much glue. Iso q tips and patience.

 

[ericfx1984]

I hate to tell you... I had a totally different experience. I've purchased from Amy at Docan several times. I've easily spent well over $10,000 with her. And I've sent the money in such a way that I had really no assurances that anything would be done correctly...

But I can tell you this. She always took care of me. One time she accidentally sent me the wrong BMS, turned out there was not the correct BMS here in the US. She had one overnighted to be from one of her clients that resells here in the States.

That's over the top amazing customer service. And there are way cheaper options out there... Docan is not the most expensive nor is it the cheapest. But they got my vote. They treat me well

 

[prosier]

To much glue. Iso q tips and patience.

To much glue? Nevermind, I see enough here

 

[prosier]

To much glue. Iso q tips and patience.

This is the 3197 cell i previously had on photo. So far all looks fine, ill stop this investigation now

 

[prosier]

These look different compared to your first photo. No visible signs of sanding.

See above here

 

[Alkaline]

They look ok to me, did docan give you the test report?

 

[prosier]

They look ok to me, did docan give you the test report?

First MB30 batch (16pcs) is from QSO. With OCV testreport, and full details on Gobel QR checker site.
Other batch is MB31 (32pcs) from Wistek, they on forehand provided me a OCV test report, and QR codes had full detail on Gobel site. However all the cell I received are not in that first excel sheet. My QR's do not have the OCV details info on the Gobel site. This is not quite what they promised... However for me not a reason, yet, to send all the cells back.

I am not sure what this means if the second half is not filled on the Gobel site... Maybe it's not an issue, maybe it could be an issue. I Have asked Gobel what this tells about a cell, if second half OCV info is there or not on their site.

 

[42OhmsPA]

View attachment 244756
This is the 3197 cell i previously had on photo. So far all looks fine, ill stop this investigation now

Those look good. Where are they from?

 

[prosier]

Those look good. Where are they from?

See 6cm above your post

• Today at 9:39 AM

 

[kostya07]

Finally I decided to look what's under the black cover of the cells.
The outcome was predictable. QR code area looks sanded and I have no doubts the new QR code was printed on top of the old one to hide the "B" mark or to change the product code.
It's up to you to decide whether it is a normal business practice to remove original manufacturer's labels and print your own.

Pidary китайские. I'm so glad I found your post. I was supposed to get an invoice from them tomorrow.

 

[SolarDiyNoob]

Can someone explain something to a beginner. Why don't you guys just find a local part out seller, these tesla battery modules go for about 350 and it would save you shipping costs. Something like this would come out to about $65 a kwh. These should last you a good while long enough for the battery landscape to change.

 

[houseofancients]

Can someone explain something to a beginner. Why don't you guys just find a local part out seller, these tesla battery modules go for about 350 and it would save you shipping costs. Something like this would come out to about $65 a kwh. These should last you a good while long enough for the battery landscape to change. View attachment 249568

The chem is unstable by nature of these cells..
They are the cause of most battery fires in the news..
No body wants ( or should want) these in their homes

 

[aussiejohn]

I think you need to hold accountable some of the people that cheerlead for Docan. Docan is doing what all the Chinese seller have always done nothing new, but every year people get lured in by the cheap prices and throw caution to the wind.

Its us old hats that warn people but are dismissed, its a reason why we always say buy more than you need, ask for a test report, e.t.c. but newbies just look for the cheapest price.

Live and learn. I see you are in Ukraine, stay safe, and good luck.

I am looking to build a 24 v 304 pack with Bluetooth and display, but the sourcing is bewildering, just simple don't know who to trust with my precious pension money, I can build a case and front panel, just need the cell pack and BMS.........

 

[Daddy Tanuki]

I am looking to build a 24 v 304 pack with Bluetooth and display, but the sourcing is bewildering, just simple don't know who to trust with my precious pension money, I can build a case and front panel, just need the cell pack and BMS.........

well.. when in Australia, do as the Australians do... buy winston and stop worrying about quality and the possibility of getting screwed over. I make fun of you guys all the time (got friends down there), so when i discovered that you jokers had been running winstons for in some case two decades without major issues I did some research... yes they cost, but you get what you pay for.

 

[Supervstech]

Can someone explain something to a beginner. Why don't you guys just find a local part out seller, these tesla battery modules go for about 350 and it would save you shipping costs. Something like this would come out to about $65 a kwh. These should last you a good while long enough for the battery landscape to change. View attachment 249568

First issue is the explody nature of those cells without extrordinary monitoring and care...
Secondly, the voltage is not suited well for most inverters.
The packs average 22V, which is far below the average inverter 24V average, where LiFePO4 fits perfectly into the mix with its average 25.2V voltage.

 

[aussiejohn]

well.. when in Australia, do as the Australians do... buy winston and stop worrying about quality and the possibility of getting screwed over. I make fun of you guys all the time (got friends down there), so when i discovered that you jokers had been running winstons for in some case two decades without major issues I did some research... yes they cost, but you get what you pay for.

Way out of my price range

 

[Daddy Tanuki]

Way out of my price range

thats what I thought at first as well, but after getting them.... well It was not a mistake. I was running with older Calbs and considering buying some Eve's... i am glad that I did not. these things are like a swiss watch. I run them up to 3.5 volts and at full charge I see about .007 deviation from top to bottom. I have never had them lower than 30% so i have no idea how they behave in the lower knee's (I tried, shut off the panels for 4 days and thats how i ended up at 30%... but i had to leave and go back to the primary house, so I turned the panels back on and when i returned the following friday (5 days) there had been fully charged, and they were sitting at 95% at an hour after sundown.

all three of my packs are paralleled to buss bars with class T fuses etc. Two packs are the winstons in 16s 22.4kWh packs and the third pack is all of my calbs that tested out OK after sorting and batching them myself, and the calbs are 3p16s for 30 kWh and when I charge the packs the winstons as above deviate up to .007 volt. the calbs after being sorted to match the capacity of each 3p and working to match the impedance as well as i could, best i get is about a .045 deviation at 56 volts now this drops to about .030 pretty quickly once you remove it from charge and quickly hits single digits after coming out of the upper limits of the knee but its still annoying.

if the CALB's were brand new from the maker I would expect the same. I bought them from a vendor online and I know that they were not brand new when I got them. I see all the issues everyone is having with the Eve's and I thank god that I waited and saved up the cash for the better batteries.

more than that I am glad I listened to the Aussies I was chatting with on a couple of yachting and boating forums. they are the ones that turned me on to the Winstons.

 

[Herculezz]

I also just got 32 more cells from Jenny last week all.were perfect, will be doing another 32.order soon

 

[Rossman]

thats what I thought at first as well, but after getting them.... well It was not a mistake. I was running with older Calbs and considering buying some Eve's... i am glad that I did not. these things are like a swiss watch. I run them up to 3.5 volts and at full charge I see about .007 deviation from top to bottom. I have never had them lower than 30% so i have no idea how they behave in the lower knee's (I tried, shut off the panels for 4 days and thats how i ended up at 30%... but i had to leave and go back to the primary house, so I turned the panels back on and when i returned the following friday (5 days) there had been fully charged, and they were sitting at 95% at an hour after sundown.

all three of my packs are paralleled to buss bars with class T fuses etc. Two packs are the winstons in 16s 22.4kWh packs and the third pack is all of my calbs that tested out OK after sorting and batching them myself, and the calbs are 3p16s for 30 kWh and when I charge the packs the winstons as above deviate up to .007 volt. the calbs after being sorted to match the capacity of each 3p and working to match the impedance as well as i could, best i get is about a .045 deviation at 56 volts now this drops to about .030 pretty quickly once you remove it from charge and quickly hits single digits after coming out of the upper limits of the knee but its still annoying.

if the CALB's were brand new from the maker I would expect the same. I bought them from a vendor online and I know that they were not brand new when I got them. I see all the issues everyone is having with the Eve's and I thank god that I waited and saved up the cash for the better batteries.

more than that I am glad I listened to the Aussies I was chatting with on a couple of yachting and boating forums. they are the ones that turned me on to the Winstons.

Where did you purchase your winstons?