Battery not being charged w/o grid meter connection

DIY
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1

Hi forum,

Yesterday, due to a network component fault, Cerbo didn’t see the grid meter for a number of hours. I would have expected that the battery would have been charged out of the MPPT during that time, but that didn’t happen. Only when the grid meter became visible to the Cerbo it started charging the battery.

My ESS configuration is 3 phase Multiplus setup, with MPPT and Pylontech batteries. The grid meter (VM-3P75CT) is connected over tcp/ip to the Cerbo via my home internet hardware.

Is this normal behaviour, or would I need to configure something for the DC part to keep functioning in such an event?

Screenshot_20260216_231554_VRM
Screenshot_20260216_231554_VRM1080×2400 130 KB

Screenshot_20260216_231512_VRM
Screenshot_20260216_231512_VRM1080×2400 172 KB

2

AIUI its normal. If you lose the meter the system goes into passthru and won’t function normally until the meter comms is restored.

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3

@wjmb

The onliest option to get independently from LAN/WLAN failures is to use the VE.Can connection between the VM3 and the gx device.

(… That’s why I buried a 30 m long outdoor ETH cable across the garden some times ago… :zany_face: )

4

Yes, that’s an option I can consider (repurposing that ethernet cable for that) if this would happen more often.

I guess I just expected the DC side (MPPT, Lynx, Pylontech BMS, Cerbo DVCC) would continue to do their thing. Much like the first picture in this thread where PV seems to keep charging batteries: Cerbo GX Venus v3.5 - losing grid meter - #2 by Xtopher

5

Nothing to do. A Standard ETH cable runs for VE.Can.

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6

The behaviour seems to be correct. I can see other topics on this subject with the same experience.
Trying to reproduce it via charger only setting does not force the same state.
The link you show above, the system isn’t in passthru.

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