diy solar

diy solar

First of two battery builds

Tulex

Tulex

Solar Wizard
Joined
Mar 30, 2023
Messages
1,075
Location
Finger Lakes NY
Sorry the pictures are blurry, my phone just sucks. This is a standup case with 16 304ah cells. Cabinet is a knockoff of Vevor 16 X 24 X 12 deep. Seplos 200a bms, 300a T-class fuse, and BEP Marinco disconnect, which has been confirmed safe to use on a 48V system. Not in the pictures is plexiglass that covers the cells. I didn't compress the cells. There is a steel plate on the bottom that has pusher bolts from the outside. Basically, they are finger tight to keep the cells from moving and prevent them from expanding. Again, from the blurry pictures, you can't see it, but there is a thin sheet between each cell. The white discs between cells are just foam pucks I cut from the packing material to keep the cells aligned.


20230717_110533.jpg20230717_110828.jpg20230717_111009.jpg
 
Thanks. Got the BMS right from the seplos site. When I built my first battery, the lcd didn't work, just got blue screen. So, tried the other one and got the same thing. Contacted them and they decided that the displays must be bad, so they are shipping me 2 new ones.
 
By the way, ignore the nut on top of battery 4, noticed it after the pictures.
Odd thing happened after adding it to my system. This became the slave battery, my master battery lcd decided it wanted to go home.
20230729_224950.jpg
 
Looking at the pictures, the only thing I'd have done differently is put the class T fuse between the battery and BMS
 
Brett V said:
I wish I had your metal working skills! Those cabinets are beautiful.
Click to expand...
Brett V said:
Looking at the pictures, the only thing I'd have done differently is put the class T fuse between the battery and BMS
Click to expand...

Thanks. The cabinets are stock electrical cabinets. We have a waterjet at my work, I just had to provide the cad file.

I went back and forth on the fuse location. Different people on here had different opinions. Ultimately, I decided I wanted to protect the disconnect/what is coming out of the battery more than I wanted to protect the bms.
 
Tulex said:
Thanks. The cabinets are stock electrical cabinets. We have a waterjet at my work, I just had to provide the cad file.

I went back and forth on the fuse location. Different people on here had different opinions. Ultimately, I decided I wanted to protect the disconnect/what is coming out of the battery more than I wanted to protect the bms.
Click to expand...
I look at the fuse as a last resort oh$hit device to prevent a catastrophic short and would want it as close to the battery positive as possible. Not saying you did it wrong, just explaining my logic. I'm still envious of the workmanship.
 
The cabinets are knockoffs of a Vevor cabinet, from a online site called toolots.

This is what comes up when I search for what I purchased, but it's showing only one latch for some reason. Size and price are the same. Shipping for both was more than the price of one cabinet, but still a lot cheaper than buying the brand name.

Vevor on Amazon
 
Last edited:
Nice looking cabinets for that price especially. I believe your idea for an inexpensive battery enclosure is my answer also. I've been dreading building something. And most metal enclosures are very expensive.
Nice fit as well.
 
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