Multiplus II sending unknown error LED codes and not powering on

DIY
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1

Hello!

I have my multiplus-ii attached to a 30A shoreline, which it has been configured for and functioned with before. When manually changing my multiplus-ii from off to inverter, I receive one of three reactions:

  1. Nothing occurs, the unit does not power on
  2. Absorption LED flashes once, Mains On LED flashes once, and then no lights are on
  3. Mains On, Absorption, Float, and Inverter On LEDS all simultaneously flash once, then no lights are on

This behavior initially began when I switched the inverter off last night to troubleshoot why I didn’t have AC power in the bus. Prior to that, I was charging my batteries via the inverter bulk state. I have attempted to disconnect all DC and AC loads, I’ve disconnected my Cerbo GX from the inverter cat5/ethernet port. I’ve taken a multimeter to the shoreline, and it is bringing in appropriate voltage/amps. Also, I receive no reaction when toggling the state to Charger. Prior to disconnecting the Cerbo, after noticing the troublesome behavior begin, I did go through its menus to look for error logs, and it showed none. It also said it couldn’t detect the multiplus. The cerbo was powered by the DC charge that had occurred during the inverter bulk state.

Initially, I did have my Air Con unit plugged in to the receptacle, and the main AltCurr breaker and receptacle breakers all on. I believe that unit to be a soft start, where it senses if it has power, then actually routes power to the condenser, but I could be wrong. I’m wondering if I tripped a fuse due to this. As I have used this inverter in this exact configuration before, I’m suspecting that there is some user error from myself involved.

If anyone has seen this behavior before, or can advise me on how to proceed with diagnosis, I would greatly appreciate any time and attention.

2

Attaching a few images, from various timeframes throughout the installation, to hopefully provide context/give some thoughts that I’m not coming to myself. NOTE: These images do not represent the exact state of the components, but rather are intended to be used as a schematic for conveying understanding of my electrical

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3

Wood & electricity… no words! :man_facepalming:
Rhetorical question, have you heard anything about safety standards?

4

Genuinely speaking, how much of a hazard do you see presented here? I tried to ensure significant airgap between conductors and any mounting hardware/wood. What do you think I could do to revise the existing condition? Apply significant amount of insulation around components to prevent arcing/skipping of fuses/components? Introduce fire retardant coating to the wood? Or would you say a full reinstall? What structural material would you recommend besides wood for this case?

5

You should contact a certified specialist who will perform all work as prescribed by legal regulations, as well as the manufacturer’s requirements.

UPD: If you previously purchased a fire insurance policy, I can assure that you no longer have one.