AC IN shows 226v with multimeter but victron connect shows 89v and won't charge battery

DIY
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1

Multiplus 24/2000 , latest firmware. All connections triple checked.

I’m off grid so in winter I occasionally have to supplement PV with a generator. I haven’t had to do this since I swapped to lithium batteries earlier this year, so my multiplus was happy with the generator input last year, but not now.

Voltage at the multiplus AC IN terminal shows 226v with a multimeter. However Victron Connect says it is 89v.
All connections checked and confirmed with my dealer.
All settings at defaults except lithium toggle and slight tweaks to charge voltages
The inverter works fine.

My dealer has never seen this before. I’m out of warranty so I’m trying to understand how this could happen.

I may have to disconnect the multiplus and battery and lug them to where there is mains electricity to see if that works. If there’s any troubleshooting I could do before straining my back, I’m very open to ideas!

2

This has not been solved, but I thought I would add a bit more info:

  1. Running Multiplus from mains (approx 220-240vac) and Victron Connect shows the AC IN as (approx) 90v. So it seems like there is something wrong with handling the AC IN.
  2. AC IN is not passing through to the AC OUT as would normally happen. So effectively the generator input is not being used at all.
  3. This worked fine last year when I had lead acid batteries, with no built in BMS. As mentioned above, I switched to a Lithium battery, which has its own BMS (this one)
    so although I can’t see how it could happen, maybe the BMS could be causing this problem?
3

Any news?? I have the same Issue. Need a fix…

4

Unfortunately not :frowning:
What’s your setup and when did it start happening for you?

5

Same problem here with a MultiPlus Compact 24/2000/50-30.

Measured voltage on the AC input is 235V but the VE.Bus value is +/- 70V so its not accepted.
No solution yet.

6

Are you using open or closed loop communication from the BMS? I don’t see how the DC side communication could cause problems on the AC side, but if you are using closed loop communication disable that to see if anything changes.

7

I’m not familiar with those terms. How do you set those?

8

Closed loop communication requires a cable (like an Ethernet cable) between the battery and the Victron system. No cable = no communication. If you’re not familiar with the terms, you’re probably not using any communication between the battery and the Victron system.

On the DIYSolarForum there are threads where the closed loop communication isn’t quite right and the charging devices are interpreting the instructions from the battery in such a way that they think charging should be halted. The result is batteries that don’t get fully charged.

9

Thanks Jim. In my case there’s no such cable