timselectric
If I can do it, you can do it.
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I don't like seemingly shady deals.
EVE 280AH cells fast shipping and great price!
- Thread starter Josh Gibson
- Start date
I am referring to "the company" that is selling batteries at the beginning of this thread. I am not trying to sell anyone here anything. Sheesh... the company I am referring to is
EVE LF280K V3 Grade A Cells - 3.2V LiFePO4 280Ah Battery
Brand new Grade A EVE LF280K LiFePO4 cells with 280Ah capacity. 10+ years design life, 6,000 cycles. Get unmatched power and performance for your energy storage needs.
www.18650batterystore.com
Which is what I believe this entire thread is about.
My point is that as of yesterday Alibaba is charging a VAT or consumption tax on all orders from Amy, and then they add a transaction fee , and when you do the math it is 10% of the total order cost that also includes a huge shipping fee for the shipping from China, then you add the wait of 50-60 days and the "great price" of $147 is much much higher.
In my specific case I bought 32 B cells at $107 each. That is $3424 for just the batteries.
Total invoice was $4400, for shipping and the new VAT tax, and the typical Alibaba fee.
If I bought the Grade A at $147 I would pay $4704 for JUST THE BATTERIES.
Add $1000 for the new VAT tax and shipping and total is $5704.
I can get grade A batteries from the 18650 battery store and the delivery fee to my door is $233, and the total price is $5273 (less tax)... so I decided to go that direction vs the Grade B cells .
Hope this clears things up, and I wish folks would not "jump to conclusions" about shady deals or dealers.
Regard all
CPU
timselectric
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Ordered 16 Monday (holiday), and received today. (3 days later) in pristine condition.
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I used the battery QR code app from Google Play and checked the mfg date on several of my cells I received from 18650batterystore.com. Looks like they were manufactured on two different dates about a month apart and were manufactured about a year before I received them in April 2022.
timselectric
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That is pretty good, I haven't checked mine yet. Other than the voltage, which was within .02v of each other.
Mine were 3 and 4 of 2021.
I chose the JK BMS (bought on Ali).
timselectric
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Only JK for me.
There's little doubt in my mind these are not automotive grade batteries, so the date was reasonable as I bought from their first shipment.
timselectric
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Can't get automotive grade. Those are kept for the automotive industry. These are always what didn't make the cut. But, they're still perfect for solar storage.
You can get them, you'll just pay a LOT more for them, lol! But yes, these are well suited for our storage needs.
timselectric
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Yeah, I Shouldn't have said "can't". Anything can be got. But for our needs, we don't need to pay 3 times as much.
houseofancients
Solar Wizard
in case of CATL , quite litterally you can't..
they go straight to polestar/volvo and tesla
timselectric
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I wanted to test these, straight out of the boxes. Connected BMS, and right into commission. And I'm amazed. 
delta is .002v
delta is .002vtimselectric
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First full charge, delta never got above 0.2v.
JK BMS, for the win. Money well spent.
Powering my loads 4 days after ordered.
Would have been 3, if I hadn't ordered on a holiday.
JK BMS, for the win. Money well spent.
Powering my loads 4 days after ordered.
Would have been 3, if I hadn't ordered on a holiday.
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First full charge, delta never got above 0.2v.
JK BMS, for the win. Money well spent.
Powering my loads 4 days after ordered.
Would have been 3, if I hadn't ordered on a holiday.
200mv without a top balance. Nice. I wonder what your max delta will be after a deep discharge/charge cycle.
What was your charge amperage?
EDIT: I presume that none of the cells went above the high-voltage cutoff point (causing the JK to shut off the charge)?
timselectric
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Charged at 80a, until 3.3v. Then backed off to 20a, so that balancing could keep up. Only cut out a couple of times. One cell was running away, just a little bit.
Going to get a deep discharge today. Due to the weather. (Thunderstorms)
burgerking
New Member
I did not Top Balance (no charger for that) and directly connected 16S to a JK.
1st time to charge them up until a cell hits OVP, delta was about 0.2v.
Another cycle, delta at OVP went down to 0.1v
Then cloudy skies for almost a week.
Today is sunny. would be 3rd time to fully charge. Will monitor delta.
BTW. I placed the temp probes shown in circle and are hitting 34°C. Is it OK? I had JK to shutoff at 36°C.
How high can they safely go?
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What was the ambient temperature and charging current when you hit 34°C?
I have the same batteries(not hooked up yet) and am wondering how much heat they will produce.
Thx
burgerking
New Member
Ambient is 30°C~31°C
The cells are inside a cabinet, not vented atm.
As of this writing, JK measures 35°C at those sensors with 35A discharge.
Now I opened the door, to let some air exchange.
timselectric
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Default setting is 70°C. Battery specs are 55°C max.BTW. I placed the temp probes shown in circle and are hitting 34°C. Is it OK? I had JK to shutoff at 36°C.
How high can they safely go?
I wouldn't go over 50°C.
burgerking
New Member
I initially set my OTP at 35°C, but seeing it was easy to hit 34°C, I up it to 36°C.
They go down to 30°C in the morning.
I am damn too overcautious. Are you confident to operate EVE cells up to 45°C?
Obviously most of you in this forum are in colder countries, so asked some local solar users how hot their factory made battery packs get under load. I received answers like "our battery is rated for blah blah blah blah and we can push it to the limit because factory guarantees it" with insinuation that our EVE cells are crap. I did not bother responding back to fanbois.
timselectric
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Spec's from EVE:
Charging temperature 0°C to 55°C.
Discharging temperature -20°C to 55°C.
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