No they are not automotive grade, whatever that is?
I am not talking about cranking amps. I pasted the specs specifically from a Rolls renewable 2V battery above (not a car battery). It shows that if you discharge at 66.75A you can discharge 1335Ah, but if you discharge at a lower rate, like 15.35A, you will see capacity closer to 1535Ah. (and conversely at a higher discharge rate, less capacity).
Feels like there should be two spec sheets, one for automotive grade cells and one for the cells that do not meet that standard.
As with most things .... 1 factor doesn't stand alone.
I guess I've assumed that the tester isn't doing their tests under wildly varying environmental conditions, and have controlled for this. Perhaps a poor assumption.
I was just answering your question about .... why temperature was being brought into the discussion ... you seemed to be dismissing it as irrelevant .... carry on.
I don't know what "automotive grade" is? Do you mean batteries that can only be discharged 50% and suffer frome Peukerts? Those are characteristics of Lead Acid chemistry. Lithium chemistry suffers none of those things. Plus no watering, no long inefficient Absorb cycles and no monthly equalization cycles. Is that is what you call "automotive grade" ?I am not talking about cranking amps. I pasted the specs specifically from a Rolls renewable 2V battery above (not a car battery). ......
I guess I hoped that the Docan EVE batteries could/would perform closer to the battery spec
Automotive grade is the spec that EVE produces their lifepo4 cells to, to sell to automotive (EV) manufacturers.
Just to be clear: Docan (or any of the sellers available to us) don't have cells that are for a different purpose. ALL of these cells are manufactured (by Eve in this case) for EV use. I don't know exactly what you are saying, but don't be thinking the Docan cells were built for something different.
I'm not sure what about my posts is so hard to understand, sorry if I wasn't clear.
Yep, I only got EVE test report with cells coming from Amy W. however I still can use my cells from docan at 0.5 C . it seems you got a bad cell.
I didn't get my cells yet, I'm talking about the two users earlier in this thread discussing it, and how Docan said the cells will only reach capacity at 0.1C.
thank for the precision. Hmmm I need to run a new capacity test at 0.5 C now
The only people we are talking to at Docan are sales people. They don't really know anything about the subject, so I wouldn't put much into it.
Okay, the spec you are talking about may be that all the cells are matched and graded. The best ones are sold to EV manufacturers as Grade A. They are available at a much higher cost if that is what you need. I built an EV years ago and used Winston cells that were $300 per kWh. When I configured my stationary pack I realized I could buy twice the capacity of these lower graded EVE cells and mitigate the issues by conservatively using the pack. Is your issue that "automotive grade" cells are more expensive?
Yeah, but two users here have mentioned the issue, which kicked off this discussion
Not at all, I guess I am simply lamenting that 0.1C discharge seems rather low is all
I am not trying to fix your issue, but the solution to that issue for me was just to configure a larger pack. The added benefit was I would get longer life by using 30 percent of the kWh capacity and had that extra capacity if we had a longer power outage with no sun.
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278.1I just got guided but other people experiences here in the forum, i did what they did, and got same results, received my 16 batteries from Docan warehouse in Houston thru UPS in 5 business days, after getting back and forth with Jenny Wu several times by email and transfering the money to a Honk Kong bank. No issues whatsoever. Very happy with my experience with Docan and happy to have saved $100 for not going thru Alibaba.
There's no comparison between spending $100 extra for some security on a purchase through Alibaba and spending several hundred more for Battleborn. For people that are new here, I would not suggest wiring $$ to a bank in China with no protections.
Agree, make no sense.
There are many people in this forum that have go this way too, so far for what i have seen and heard, no one has had any kind of problems (at least not with Docan) that`s why i did it. Anyway, if somebody is suspicious of losing their money, you should do whatever you need to do to make yourself comfortable, even if it is spending more money that needed. i am planning to buy another 16 batteries the same way.
It's spending exactly the amount of money they need to spend for their level of risk. You might view it as "more than needed" but that's is your evaluation for your risk level
