Building 48V battery bricks from recycled lithium ion 18650 cells
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- Опубликовано: 25 авг 2024
- In this video, I do a deep dive into the technicalities of building the 48V bricks I use on my DIY solar power energy storage cabinet. Warning: Contains maths and physics!
The simplest explanation ever👏
informative and not boring, congratz from Panama
I love your teaching style :)
The 0 in 18650 stands for cylindrical cell form. Not sure why Panasonic tried to dump the last 0 in the 21700 when they called it the 2170.
The nominal voltage thing goes back to power bank companies wanting to boost up their watt hour rating. The vast majority of lithium ion cells are 3.60 to 3.65. There are some "LiHV" cells especially in the Lipo world that charge up to 4.30V and 4.35V but those are fairly rare in the 18650 world. Samsung, LG, and Sanyo have all made them but you don't find them quite often.
If you look at the datasheets of cells they will give a more specific nominal voltage. LG MJ1 is 3.625 and a lot of cells are this same nominal voltage. I can't remember which chemistry is usually 3.65 I think its NCA. Powerbank companies decided to round up hoping to make their packs look slightly bigger than the competition and then their competition started using 3.7 as well. So just a big sham.
LiFePO4 has the same weird thing with battery pack nominal voltage ratings. 16S is the most common "48V" size even though it is 15S is exactly 48V.
good video tks
any more solar videos. this is greate explanation. i would like to know what is the thing you connect to battery at the end. 19:33 , it seems like a battery balancer or a capacity meter.
You haven't uploaded anything new since. Hope you're still okay & in good health
biscuit and cookie are two different things!!! amazing to me ..all my life i have wondered how its your language and you cant speak it properly....ALUMINUM!!! keep trying that until lya get it.. carry on
Hi John thanks for the video. It seems like I'm quite late to the party, early 3 years now.
I wanted to ask you a question about the 18650 on ebay. I have around 40 salaved 18650 and I wanted to sell them on ebay. Would you be able to share some advice on this? Pricing and packaging / shipping are my two biggest questions.
Thanks.
Great vid
Where is the BMS? In this setup you need one per block!!!
Yes, you really need a BMS or, at minimum, a balancer on each brick. Even more seeing how you just fill up the brick without evenly distributing the capacity per row.
At the very least you should consider interconnecting the bus bars between all bricks so as to better balance capacity differences among rows.
Hi friend I also made a 24kw 18650 wall
Curious what you have set as parameters in the inverter
such as Bulk Voltage
float
Network return
Voltage Cut Off
My settings are these
For a wall of 18650 2A parallel 15 series 270
P26 Bulk 60.5V /15 4.033V
P27 Float 59.5V /15 3.96V
I don't know if FLOAT and BULK must be equal value in LiIon ?
P13 Return to discharge voltage 50V 3.33V
P29 Cut Off Return to Enel 50V /15 3.33V
Then in case the BMS or Inverter goes crazy
I always have SRV1000 and DRY Contat A30 as security
Setting SRV1000 and A30 and BMS Daly
V-Max=62 V-Min=48 5s delay 2V delta
Hello sir what inverter u using? Thanks
ahh good one,,, just a little addition the 3.7v of the battery comes from the natural volt generated from the chemistry used when brought together without charging and discharging.... just like our good aa and aaa alkaline batteries have rated of 1.5v which are their chemistry natural volt output
Great video! Any updates on how it’s been running for you over the past year? Thanks!
It keeps my office off grid about 6 months of the year, from about mid march to about mid September. 20 bricks currently online, approx 15kWh. Planning a video on balancing battery bricks next.
@@bumblinggimp hello sir where did you got ur inverter from you got a link for the purchase? Thanks
Hello sir where did you got ur invertor , you got a link from where you made the purchase? Thanks
I have a kit for this if your interested, more expensive, easier to use.