While rewiring a Multiplus-II installation, I broke the Bat- screw, not by over-tightening it (I use a dynamometric wrench), but probably while guiding the 35mm2 wire and rotating it many times. I thought the nut was sufficiently hand-tightened to prevent the wire from moving, but apparently not...
Here is the result:
My plan to repair this is either:
- carefully drill the remaining of the screw, re-thread the remaining of the soldered nut on the other side, and screw what's left (second photo), probably adding a bit of solder
- unsolder the remaining, as it appears to be a soldered nut on the bottom of the PCB, and replace it with a new brass bolt, to be also soldered
What do experts thing about that? What kind of soldering iron do I need (20W, 50W, more)?
Since this setup allows for 35A sustained charging, 50A sustained discharging, and 115A peak discharging (PylonTech battery at 48V), I hope that will be OK...