I got 8 EVE LF304 from Amy at Docan Power. Before assembling the cells, I asked her what torque to use to avoid damaging the welded terminals. Her answer was: "The normal torque <6N.m"
To be safe, I set my torque wrench to 5 Nm. While tightening the nuts I encountered an odd phenomenon: As I...
Ok, I see. We got our wires crossed. Sorry.
I have done a bit of research on commercial devices that could help with this. None that I found are able to control bistable relays directly. But some are made specifically for controlling separate charge and discharge relays. I case you are...
Looks very solid. Could you explain a bit more?
Am I right that you use the Electrodacus as a BMS that controls relays? What type of relays do you use? Bistable or monostable?
I was considering the Electrodacus but it is no longer available; and the developer seems not to have followed through...
I just looked at the datasheet for the bm3451. I think, you have a good system to modify. It says:
[...] in the state of over-discharge [...] the output voltage of DO will turn to GND. The discharge MOSFET will be turned off and stop discharging [...].
It specifically does not say anywhere...
I have a 4S LiFePO4 battery bank from which I need to draw 400A for about 3-5 minutes.
After some discussion with JBD, they concluded that none of their BMS will work for me.
Hence my latest idea: Can I use a modified low-current split-port BMS to drive my charge and discharge relays? And of...
That post was the main reason for my question of whether you know how deep the terminal can be drilled:
While the OP in that post says that the machine shop "removed" the stud, that is most likely not what they did: The studs seem to have a hexagonal "head" that is pressed into the welded...
Yeah, and it looks like Docan has absolutely no intention of delivering replacements. Amy seriously suggested I pay for shipping the faulty cells to and from China so they can re-weld some new studs! Delay: 4 months.
@peacefulcurrant Can I ask where you got your cells? I ask because I have the same problem.
I got my cells from Amy at Docan Power. I followed their torque specifications to the letter and the bolts on their cells still broke!
You can with JBD devices. You have to go use the JBDTool with the RS485 interface however.
That would probably not be feasible if I use a small BMS to modify. A device for 20A will likely have a much higher resistance as a current sense resistor than a 500A device. The first will use a higher...
In theory you could connect them in parallel PROVIDED that your large external shunt has a significantly lower resistance than the internal shunt. Otherwise a much larger than designed current will flow through the internal shunt and blow them. Is safer to just disconnect them all-togther.
The...