joe6789 wrote:
I'm fine ditching the switch. You're right that Victron did not call for it. The purpose was simply to be a master battery disconnect, so I could disconnect ALL loads (not just the inverter) on the battery when the trailer is not in use. But I may have to live without the switch, and manually unhook the battery instead when the trailer is not in use.
It would still be good to know what is happening though. I doubt the issue is the switch itself, as it seems to be functioning normally with only the inverter connected through it. My best guesses right now are either:
a) Some sort of feature on the inverter, but I'm still not sure how the inverter could possibly be dropping the battery terminal voltage to zero
B) Some sort of feature on the Battle Born batteries. They have a built-in battery management system, so maybe the batteries are shutting themselves off for some reason when the switch turns on.
I have the workaround for now (only hooking one component through the switch), so I'll proceed with the installation while I'm still figuring out what was going wrong.
First off I must have missed the fact that you have Li batteries (how many??), and know that the BMS can definitely be your problem... Do you have another battery which you can temporarily substitute for the Lithium ??
I recently installed a single 100a LiFePo4 Lithium in a camper conversion, and was able to see during start-ups of the Coleman Mach 1 P.S. ‘momentarily’ as high as 400 dc LRA amps via the Victron meter, thus one might assume that the BMS was tolerant of this sudden but momentary loading, though the mfg. surge specification was rated at only 200amps for 20 sec...
The voltage drop you’ve described is a red flag, thus I believe your BMS might somehow be the root cause...
3 tons
