2 x in 1 box LifePO4 15S build with JK-B2A24S20P BMSs
- Thread starter LydMekk
- Start date
Why the vent holes with mosquito netting? Want to keep the batteries as cool as possible.
Very hot climate her in south Spain and living in the countryside so the occasional bug vanders around.
Don't want them in the battery ^^
Very hot climate her in south Spain and living in the countryside so the occasional bug vanders around.
Don't want them in the battery ^^
Finished...in production - no issues. Installed a transparent plastic lid.
The red lights look cool ^^.
I know the fuse on the negative isn't really needed but it makes me sleep better at night...
The positive side has fuses inside the Victron box.
My only piece from Victron - Lynx Power-In busbar connecting old and new batteries.
So, a total of 1360ah should last some time before the upgrade ghost visits me again ^^...
The red lights look cool ^^.
I know the fuse on the negative isn't really needed but it makes me sleep better at night...
The positive side has fuses inside the Victron box.
My only piece from Victron - Lynx Power-In busbar connecting old and new batteries.
So, a total of 1360ah should last some time before the upgrade ghost visits me again ^^...
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Looks really good, I don't think you will have heat issues... The cells will warm up when charging but it isn't that much unless you are pushing 0.5C at each side...
I REALLY LIKE THIS ! Can you provide a link for it ?
I REALLY LIKE THIS ! Can you provide a link for it ?
Block cable splitter
That one has some brittle plastic, 3-4 single units where destroyed during first install. I would try another brand if I were you.
There is several alternatives on Amazon with similar config.
It helped me make the battery sensor leads long in a "professional" way due to me wanting the form factor of the cells long and in one row per battery and the JK BMSs on the shelf at one end.
I used ferrules (small ones) at one end of the cables to the plug into this. I think there is a picture here showing the ferrules.
That one has some brittle plastic, 3-4 single units where destroyed during first install. I would try another brand if I were you.
There is several alternatives on Amazon with similar config.
It helped me make the battery sensor leads long in a "professional" way due to me wanting the form factor of the cells long and in one row per battery and the JK BMSs on the shelf at one end.
I used ferrules (small ones) at one end of the cables to the plug into this. I think there is a picture here showing the ferrules.
Yeah it stays very cool which was the intent. Resting temps are 22-23C in the cells and 26C in the JK BMSs.
Only charging with 40ish amps per battery as I have 6 and the total adds up.
Also, wanting to keep things cool and the lifetime longer I don't see the need to charge any faster.
My total pack is charged to full at around 14:00 each day.
Only charging with 40ish amps per battery as I have 6 and the total adds up.
Also, wanting to keep things cool and the lifetime longer I don't see the need to charge any faster.
My total pack is charged to full at around 14:00 each day.
Yes. 4 old, 2 new. The new ones are 280ah's (old ones 200ah each) and therefore it is like adding 3 more of the old ones in regards to capacity. I have 2 pcs. more of the EVE 280K cells as a reserve or if in the future I will transition to 16S configs.
Charging with 3.55 per cell x 15 pcs = 53.25V
Float with 3,45 x 15 pcs = 51.75V
Charging with 3.55 per cell x 15 pcs = 53.25V
Float with 3,45 x 15 pcs = 51.75V
Some useful links to products:
https://www.amazon.es/gp/product/B0BFKFQVR5/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B097M2RD4M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B000MMC914/ref=ppx_yo_dt_b_asin_title_o04_s01?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B00ORVVKDE/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
You should find the same stuff on amazon.com in the US.
My links is from the EU.
But, they market the same products on all amazon's.
https://www.amazon.es/gp/product/B0BFKFQVR5/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B097M2RD4M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B000MMC914/ref=ppx_yo_dt_b_asin_title_o04_s01?ie=UTF8&psc=1
https://www.amazon.es/gp/product/B00ORVVKDE/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
You should find the same stuff on amazon.com in the US.
My links is from the EU.
But, they market the same products on all amazon's.
dielectric
New Member
- Joined
- Dec 5, 2022
- Messages
- 67
nah, not mkayYOU are correct. Steve's statement above is not correct.
A battery pack with 15S instead of 16S will be slightly less in amps (equivalent the 280ah from the "missing" cell).
There are NO other differences.
Ofc. it will discharge slightly faster than a 16S cell but again: only by the amount of the "missing" cell.
And Steve, a 16S pack IS 51.2V not 48V as a 15S battery config.
Mkay?
48v is a nominal "label"
"lower amps" is imprecise enough to be misleading
lower amp-hours (capacity) is accurate
but also higher running amps - by ~6% -> more wire and bms heating etc
some inverters are capable up to 60V and are labeled a "48V" system
I am using 17s packs charging up to 3.5V per cell this reduces the amps a little bit and increases the pack capacity by about 1kWh
This reply to this old thread is to help future readers.
Last edited:
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
15S Pack using 200AH cells example.
LFP @ 3.000V X 15S = 45.0V while 16S=48.0V
LFP @ 3.200V X 15S = 48.0V while 16S=51.2
LFP @ 3.400V X 15S = 51.0V while 16S=54.4
15S MIMMICKS 48.V FLA and is commonly used for older equipment that has locked charging/discharging profiles that do not support LFP or other Newer Chemistries. No New Equipment is limited by such.
Both a 15S or 16S can output that 200A but the difference is how long they can do that is also a factor... 1 less cell IS a bit of loss on that end.
LFP @ 3.000V X 15S = 45.0V while 16S=48.0V
LFP @ 3.200V X 15S = 48.0V while 16S=51.2
LFP @ 3.400V X 15S = 51.0V while 16S=54.4
15S MIMMICKS 48.V FLA and is commonly used for older equipment that has locked charging/discharging profiles that do not support LFP or other Newer Chemistries. No New Equipment is limited by such.
Both a 15S or 16S can output that 200A but the difference is how long they can do that is also a factor... 1 less cell IS a bit of loss on that end.
joelsoleski
New Member
- Joined
- Aug 1, 2020
- Messages
- 45
Hey sorry to highjack the thread but what would a 15s 2p battery look like layout wise? I have 2 damaged cells so am stuck with 30 cells total. Purchased a 15s bms
ScrotpusGobbleBottom
Corn Pop was a bad dude.
The same as the pictures that were posted minus 2 cells. As far as the JK BMS, you would simply need to make cell 16 vacant, not cell one or any other than cell 16
What happened to the cells??
joelsoleski
New Member
- Joined
- Aug 1, 2020
- Messages
- 45
Thanks man, and I have a 15s bms made for my application but I was using the battery for a go kart and it got pretty banged up lol, opening up 2 cells I knew because they smelt bad
ScrotpusGobbleBottom
Corn Pop was a bad dude.
Well that sounds like fun!
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