Is the Multi properly connected to the mains or has a fuse and/or residual current device tripped … There is more to your system than just the one in your picture … So where does the mains connection come from?
I’m reviewing the setup and diagram. But being a novice/layman let me ask a follow up: By “mains” to mean the 12v power to the multi, or something else?
Also, FWIW, I found a Victron licensed contractor near me who I am visiting tomorrow to buy an hour or 2 of his time to review the system and get a second opinion on the install. Your help in troubleshooting has been immensely valuable in communicating with him today.
ETA: I’ll follow up tomorrow with his recommendation, and will try and update as we come to resolution. Hopefully it will be helpful to someone else.
Ethan,
before spending money for a technican, please make shure, that your batteries are charged. As you’ve mentioned in an ealier post, you’ve measures something between 12-13 Volts. That’s less !!!
If the capacity is low, switching on a MP will cause a massive current which will cause a voltage drop. If the drop is below to specs, the MP will not start.
Procharge the batteries and in the future, when you don’t need you RV, use the battery-switch to turn the system off.
Sorry for my english, it’s not my mothertongue…
Best,
Wilm
Thanks Wilm. The shunt reported 100% SOC yesterday when I was in the van, we have a couple 12v USB outlets that system voltage readings and they were at 13.6 when we started. The installer I originally worked with told me that 13.6v meant “100% SOC”.
The full story, aside from me getting direct to the point in the post about the problem. Is that we had installer originally do this, it worked great for ~6 months, when we took it back for him to do more work. After we got it back, the MP inverter was working fine, but the solar was behaving as it is now (0w not charging, not reaching max ~22v), and the SOC from the shunt was just always -- on the display.
We took the van back to him again to fix the errors that came up after he last worked on it. And when I got the van back, inverter was working, solar was working, and I would occasionally see 14.4v on the charger - which as I understand means it is under “bulk” charging.
At this point, I feel like it is probably above my head to fully diagnose this. We’re 90% done with the initial van, and I just want to get the electrical system back fully operational again 
ETA: We do turn off the inverter when the van is not in use
This round of issues is solved. It only took the Victron (and Battleborn) licensed installer 3 hours to spot and correct the problems:
- Inverter and Cerbo were not installed correctly for the VE.BUS protocol. There were no terminators in the CAT6 cable, this explains why I was able to get the inverter to turn on when I disconnected it from the Cerbo. Inverter was also badly misconfigured for the battleborn lithium batteries.
- The solar panels were mismatched (2 x 250w (36v), 2 x 100w (24v)), and using a piggytail connector that did not rate for enough voltage - it was melted shut when I got there today. The TIL from this one is that the MPPT charge controller looks for a “happy medium” (as described to me at least), and so it is likely it was never using the 250w panels at all. Removing the 100w panels from the system immediately led to ~300w of solar power coming and running at 36 volts (and thusly charging the battery). There were other missteps like the panels not being on the same plane and the shade from one panel to the other was likely causing them to turn off unless the sun was exactly overhead.
- The shunt was improperly configured for lead batteries and not the battleborn lithium ion’s that we have.
Thank you guys so much for the responses over the last couple of days. They greatly improved my ability to come in and communicate to these guys what I was seeing and what I had done for troubleshooting which saved me several hundred dollars of their time.
No terminators needed !
It began working as expected with the Cerbo after they were installed. Perhaps there is some detail I am forgetting, but I don’t think so. It was the last thing that was worked on during the session and I was there the whole time.
Ve.bus is designed to work without terminators,
the various can systems need terminators.