Hi,
I'm planning on building a battery bank that would act as a power source for my equipment where I work.
When I get in to the nitty gritty I plan to make a thread here to help check my thinking an ensure I don't make any cockups.
For now, I am trying to find the 'best' cell for my needs.
My two primary concerns are size and weight, so this counts out LFP for me - even though its life cycle is better.
I was initially looking at the Samsung INR18650-35E - this would be in a 7s17p setup. However upon reading its spec I am concerned with it's cycle lifeand I am wondering if there is a better cell to choose.
What has turned me off of the Samsung specifically is that their spec sheet has the capacity?2010mAh or 60% of capacity after 500 cycles at 3500mA, charged at 1024mA or 0.3C.
I had thought the 35E chemistry (which I believe isLiNiMnCoO2) should be better than this.
I understand that cycle life is highly dependant on depth of discharge as well as speed of charge, but the figures for the Samsung seemed lower than other cells, but the specs are not always easy to find, and the included graphs not always easy to read.
I am essentially after a cell that has a good density over3000mAh, with the ability to supply continuous current of about 80A in a 7s17p set up that I can charge in 2-3 hours.
I will end up poring over specs, but I was hoping you fine folks here ma be able to give me a little direction!
cheers,
I thought I would post an example of the difference I am seeing incase I am reading specs incorrectly:
Samsung 35E Specs- Page 8:
charge current 1,020mA
discharge current 3,400mA
500cycles.
Capacity ? 2,010mAh (60% of Standard Capacity)
Sanyo/Panasonic NCR18650GA- Page 7:
Graph appears to show:
charge current 1,650mA
discharge current 6,000mA.
500cycles.
Capacity ?2,200mAh
These Sanyo also has a slightly higher max cont discharge of 10A vs 8A.
Essentially the Sanyo seems to be a better cell in every way I can find, and it is only marginally more expensive to purchase.
I'm planning on building a battery bank that would act as a power source for my equipment where I work.
When I get in to the nitty gritty I plan to make a thread here to help check my thinking an ensure I don't make any cockups.
For now, I am trying to find the 'best' cell for my needs.
My two primary concerns are size and weight, so this counts out LFP for me - even though its life cycle is better.
I was initially looking at the Samsung INR18650-35E - this would be in a 7s17p setup. However upon reading its spec I am concerned with it's cycle lifeand I am wondering if there is a better cell to choose.
What has turned me off of the Samsung specifically is that their spec sheet has the capacity?2010mAh or 60% of capacity after 500 cycles at 3500mA, charged at 1024mA or 0.3C.
I had thought the 35E chemistry (which I believe isLiNiMnCoO2) should be better than this.
I understand that cycle life is highly dependant on depth of discharge as well as speed of charge, but the figures for the Samsung seemed lower than other cells, but the specs are not always easy to find, and the included graphs not always easy to read.
I am essentially after a cell that has a good density over3000mAh, with the ability to supply continuous current of about 80A in a 7s17p set up that I can charge in 2-3 hours.
I will end up poring over specs, but I was hoping you fine folks here ma be able to give me a little direction!
cheers,
I thought I would post an example of the difference I am seeing incase I am reading specs incorrectly:
Samsung 35E Specs- Page 8:
charge current 1,020mA
discharge current 3,400mA
500cycles.
Capacity ? 2,010mAh (60% of Standard Capacity)
Sanyo/Panasonic NCR18650GA- Page 7:
Graph appears to show:
charge current 1,650mA
discharge current 6,000mA.
500cycles.
Capacity ?2,200mAh
These Sanyo also has a slightly higher max cont discharge of 10A vs 8A.
Essentially the Sanyo seems to be a better cell in every way I can find, and it is only marginally more expensive to purchase.