MultiPlus 12/800/35-16 Not charging leisure or inverting

Hi,

After some help! I've got a MultiPlus 12/800/35-16 on my boat with start and leisure batteries. It has worked perfectly in the past but recently it is not charging the leisure battery or inverting when I remove its power source. I've charged the leisure battery with a separate portable Victron charger so I think the battery is ok. I've got a fuse between the MultiPlus and the leisure battery so I've changed that. I've got a SmartShunt on the negative of the leisure battery so I can accurately check its status.

Any further troubleshooting ideas?

Thanks!

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klim8skeptic ♦ commented · Apr 24 at 05:25 PM

@knotty Unplug the Multi from the raspi.

Just to check if the pi is sending out the wrong signals.

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knotty klim8skeptic ♦ commented · 4 days ago

Unfortunately, this didn't make a difference. I disconnected the Multi from the RPi and then removed the power from the Multi and it didn't switch over to inverter. Thank you for the suggestion. The two photos are about a week between them. You can see the battery voltage has dropped even though there is no load and the Multi should be charging the leisure battery. Like I said I've changed the fuse on the cable from the Multi to the leisure battery. Any other ideas? Thanks!

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klim8skeptic ♦ knotty commented · 3 days ago

@knotty your VRM snap shows STORAGE while the battery is at 8v. Something is broken there.

It would be a good idea to reset the multi to stock firmware (and stock config), as that will reset all parameters to a known working setup. v459 was the last stable firmware.

Then unplug the raspi and note the multi leds, and smartshunt voltage and current measurements.

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