Hey hey hey, I spent about 3 years “learning to solder” with unnecessarily large wire, low quality solder and a shitty iron.
This is absolutely the case, after 3 years of hardware store stuff, I bought a Ksger and kester solder and suddenly all of the experience I had began to show. Even borrowing a friend’s quality soldering station is very likely to show you’re more skilled than you’re aware of.
Nice work dude, that bms looks interesting, which one is it? Interesting choice to wire for discharge as well
It’s not always necessary but it’s considered good practice around here to insulate between your balance wires wherever they cross over each other on top of a battery. Alternatively, make the crossovers before they enter the battery so that they all branch off in order.
If you can ensure that there is no possibility of pressure being put down onto the balance wires, then it’s fine the way it is.
Thanks man! I was so careful to build this thing right and insulated everything and then completely overlooked the crossing balance wires!! Hahaha. Good catch, I’ll add some before I wrap it, thanks for the heads up.
I originally had a daily BMS but it was too big to fit my profile so I ended up picking up a Maxkgo 200A unit. Fits perfectly on my p pack boxes I printed. I guess now I have to build another to use the Daly haha.
I think a lot of the Daly smart bms have a temp sensor wire that needs to be plugged in for the bms to work. I’m hooking one up tomorrow and was planning on putting the wire in the center of the battery.
Yeah the Daly unit I bought has one. Unfortunately the BMS was too large to fit in my enclosure I made so I ended up getting another BMS. No BT or anything on this smaller unit but it has a canbus which the vendor sent me the spec sheet for so I can use an ESP32 and write my own program to monitor everything with a touchscreen on my electronics box
Thanks man! I am not a fan of soldered wires if there is a better option. In this particular case the battery is capable of 240 amps discharge (I built it for possible future more heavy duty use in case my old ass gets busted trying to learn to esk8 lol). So rather than attempting to squeeze some 1/0 in there I made some nickel / copper sand which bus bars that run down the sides. (.2mm x 40mm nickel, .2 x 40 copper, .2 x 40 nickel) and spot welded all that together so you end up with a flat and clean look that adds 1.2 mm of width and more than capable of carrying that amperage.
Yep looks very clean. I would suggest that you rethink your aversion to soldering if you end up building another esk8 battery tho. There’s a reason why it’s a best practice. Specifically, in a high vibration environment, it builds in some flex between p groups leading to a more robust battery. I can’t see how you’ve connected the groups together but your pack will naturally flex a bit and will also be subject to significant vibrations. If your p-groups aren’t very securely connected together, welds oriented like this have been known to fail.