Do you prefer to buy the cells for DIY or buy the battery pack already assembled
- Thread starter Blue Sky
- Start date
DIY.
Gives me much more flexibility on cells and BMS, fits better in my system, and I need to add a heater/insulation anyway. Also allows me to use larger cells, which are generally cheaper. Maintenance is also easier compared to assembled systems that might have cells welded at the terminal. I can also make my packs at 50% the cost per kWh compared to off-the-shelf.
Gives me much more flexibility on cells and BMS, fits better in my system, and I need to add a heater/insulation anyway. Also allows me to use larger cells, which are generally cheaper. Maintenance is also easier compared to assembled systems that might have cells welded at the terminal. I can also make my packs at 50% the cost per kWh compared to off-the-shelf.
Rednecktek
Solar Wizard
It depends on the system. For 12v stuff like my solar dolly, my brother's trailer, my diesel heater project, etc I prefer to build, but when I get my cabin system re-done I'll be dropping the cash for a 300Ah Trophy to deal with the cold and ease of use for people who aren't me.
DIY battery pack are indeed more convenient and flexible; This means a certain knowledge of electricity; If the batteries are damaged by your own mistakes, you need to buy them again and replace them. But many people prefer to buy cells for DIY.
sunshine_eggo
Happy Breffast!
DIY
Only 294 cells.
Only 294 cells.
That sounds interesting, can you share some pictures about your project? I'm very curious
Wow, really good job! Is this a rack-mounted DIY energy storage system? It looks very complicated. What is the capacity of each cell, and how many modules are there in parallel?
What country are you in and does it require UL certification?
sunshine_eggo
Happy Breffast!
NMC Bank, Bus Bars and Batrium Love
It has been years in the making, but I finally have the NMC battery poised for deployment... (okay, only half, but still). Summary: 7X Ford Fusion/C-Max Energi PHEV batteries, 7.6kWh rated per pack. Each battery: 84S 25Ah 3.7V NMC cells. Four subpacks of 21S in series Packs have tested...
diysolarforum.com
21P14S
Only half of it.
wattmatters
Solar Wizard
I don't have the space for a DIY shelf, nor can I reasonably construct a good quality protective casing for it. So I bought server rack batteries. They fit neatly into the space I do have and I don't really need to do much else but to connect them to the bus bar.
The other option was the self-build kits like the Seplos but I priced it up and really the small price difference wasn't worth it, especially given the hassle and risk of importing cells from China.
But if I was building something in a shed without space restrictions, then maybe I would DIY.
The other option was the self-build kits like the Seplos but I priced it up and really the small price difference wasn't worth it, especially given the hassle and risk of importing cells from China.
But if I was building something in a shed without space restrictions, then maybe I would DIY.
USA, my State adopted NEC 2020 and will probably adopt NEC 2023 soon.
ESS needs to be listed. They interpret that to be UL.
Nobodybusiness
Collecting the leftovers of the Great Sky Reactor.
Are those repurposed EV cells?
Never mind. I should have just kept on reading instead of posting.
Neat setup.
Rednecktek
Solar Wizard
Links are right there. ?
Anomof
New Member
When you purchase a prefab battery wrapped in Mylar tape and placed in a plastic case stuffed with foam is there the proper amount of compression applied to the cells during the top off charging where cells begin to expand?
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