I'm in the process of building out my van and just tackled the electrical system a few weeks ago. Everything but the DC/DC charger was hooked up and the system was working well until a few days ago when I noticed when the inverter was turned on the voltage would drop from 14v to 9.4v instantly. I brushed this off as something to address in the coming days as I wasn't actively relying on the outlets. Everything seems fine for a couple days, the voltage was still above 14v and SOC was 100%. With no loads on the system I thought I had no reason to be concerned about the battery health. That is, until the other morning when I came out to the van and the BMV display was dead and the system registered 1.07v on my multimeter. The battery logo on my Renogy 40A Rover MPPT was flashing and I had an excess battery discharge error. When I turned off the system with the cut out switch and tested the battery terminals directly, they only registered 9.4v. When I turned that the switch back on, that same terminal reading equalized to the rest of the system at 1.07v. Since the system is too dead for even the BMV to function, and the solar panels aren't charging the batteries, I don't know how to proceed with getting this back on its feet.
Another fact that may be helpful: 2 days before the power cut out, I changed a couple settings on the BMV as per Victron's recommendation. The peukert exponent was changed the 1.05 and the charge efficiency factor to 99%.
My system components are listed below:
4x 100ah SOK Batteries
4x 100w Renogy Solar Panels
40A Renogy MPPT Charge Controller
Victron BMV-712
Lynx Distributor
3000w Victron Multiplus
I'd really appreciate any help I can get on this issue. I'm a little lost and don't know where to begin. Thanks in advance!
