The bus bars arrived today and I’m waiting for the rest of the hardware and some single cell chargers so I can top off all of these cells before final assembly.
I need to do another dry fit assembly first to make sure the cross bar fits.
Given that I've seen a couple of post in the last few weeks about families not being able to access important information that was in a loved ones home lab, I thought it would be a good idea to share this talk from Shmoocon 2016.
Even if it's just telling someone it's all junk and can be switched off can mean a lot when you're gone, but for more and more of us, we're hosting more and more home and family information in our labs.
I received notification that my bus bars have shipped!
I still need some assorted hardware (M4 threaded rod and lock nuts and M6 screws and lock washers)
I modeled the bracket for the BMS, I’ll probably add some cable management to the BMS bracket and an Anderson Powerpole connector for the main power connector
Once I have all the hardware in a couple of weeks I’ll top off each cell and connect everything and program the BMS.
I still need to fabricate a cable to connect UART to an ESP32.
I’ve printed the cell holders. It’s a tight fit, I need to order some M4 threaded rods and lock nuts to assemble the pack and some M6 screws for the terminals.
I ended up with a Daly SmartBMS and now I’m waiting for the bus bars from send cut send.
Oh and the supplier sent each cell wrapped in cellophane tape, that was a joy to remove </sarcasm>
All but 2 had the same OCV of 3.28 with the other two being .27 I feel with the BMS this should be fine I matched the two low voltage cells in a parallel string. We shall see.
Ok so I finished designing the cell cage for my 12v 40Ah battery. It fits like a glove. So now I know the geometry is solid I sent my bus bar drawings off to a company for fabrication.
I actually think I’m going with a DALY active BMS.
My next task besides ordering more hardware is match ing the cells.
I’ll update when I get around to doing that.
The quick background is that I have my entire ham radio setup in a mini-rack. I currently power it with a Jackery power box but wanted my 'ham shack' to be a bit more self-contained.
I came across some used lifepo4 cells and acquired some, I've been looking at different BMSs and right now am considering a JKBMS JK-BD4A8S6P, I'm not committed to it so I'm happy to hear anyone's recommendations pros/cons etc.
I still need to add mounting points to the base plate of the battery cage, and the top will have a channel for the bus bar.
I'm looking at 4s2p with a target of 12.8 volts and 40Ah
The cells are spaced 2mm and there will be 7 bolts holding the entire stack together.
The cage will likely be ABS or ASA and I will design a cover for the terminals as well.
Am I missing anything?