AussieInSeattle
New Member
- Joined
- Jan 2, 2020
- Messages
- 59
Firstly, I'm fine - was wearing safety glasses and gloves at the time and the top of the pack was covered - I do need some new underwear though. In short (no pun intended) I spent the past 3 weeks building my 120Ah 48V pack ever so carefully and managed to short it while hooking the finalized pack up to my golf cart by not having a correctly protected socket handle (left small piece of metal exposed near where you switch direction). On the positive side of the exterior of the pack there was a 400Amp fuse - have not inspected it yet to see if it blew. Disappointed as I was so careful along the way with insulated tools and put a lot of time and effort into the build.
I shorted between the 400A fuse (the nut you see in final pic) and a cable that was connected to the P- of the shunt (not shown in final pic). Only the charging side went through the BMS and relays were in place to cut the golf cart speed controller (white cable) via a relay hooked to the BMS in an overvolt situation.
Pics attached of the carnage - I've since removed all bus bars, covered the pack terminals from the elements and put the pack outside while I work out next steps and wait for my heart rate to lower. Cell #14 is toast and has vented - you can see its + terminal blew molten busbar towards cell #9 - lucky the pack was covered at the time!
The renogy battery meter still read 43.5 volts when I plugged it in before disassembly of the busbars - the pack was 53.4 volts prior to the unexpected arc welding.
What should my next steps be to dispose of cell 14 or all of them? Are all cells toast? Also not sure if I want to proceed with the build at all as it scared the crap out of me.
Note that pic #1 and #5 are from prior to the carnage.
I shorted between the 400A fuse (the nut you see in final pic) and a cable that was connected to the P- of the shunt (not shown in final pic). Only the charging side went through the BMS and relays were in place to cut the golf cart speed controller (white cable) via a relay hooked to the BMS in an overvolt situation.
Pics attached of the carnage - I've since removed all bus bars, covered the pack terminals from the elements and put the pack outside while I work out next steps and wait for my heart rate to lower. Cell #14 is toast and has vented - you can see its + terminal blew molten busbar towards cell #9 - lucky the pack was covered at the time!
The renogy battery meter still read 43.5 volts when I plugged it in before disassembly of the busbars - the pack was 53.4 volts prior to the unexpected arc welding.
What should my next steps be to dispose of cell 14 or all of them? Are all cells toast? Also not sure if I want to proceed with the build at all as it scared the crap out of me.
Note that pic #1 and #5 are from prior to the carnage.