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jeroen13 avatar image
jeroen13 asked

Cerbo dbus-roundtrip-time issues

Hi,

Since a few days I have my ESS running with 3xMPII 1xSmartsolar and Cerbo GX. The cerbo is running VenusOS 3.41 large with Node-Red enabled which I use to read my Homewizard 3 phase energy grid meter using the dbus-mqtt-devices plugin which is read every second. The cerbo is connected still via WiFi with a signal strength of -60dBm (according to unifi) will be switched to LAN cable this week. The battery is a smart BMS communicating via CAN.

But i'm have some issue that I get multiply times a day is that the BMS communication is lost for very short period, I noticed that when that happens the grid meter also disappeared in the console and I'm getting message that real-time is disabled in HRM.

So i checked the dbus-roundtrip-time and saw that there were large spikes every 4 to 6 hours, visually there seems to be a pattern (trying to upload a picture here but getting parsing response failed).

So the questions how can I find out what is happening

cerbo gxNode-REDpower loss
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2 Answers
nickdb avatar image
nickdb answered ·

That is often load on the cerbo and frequently related to modifications, 3rd party drivers, node red flows etc.

Test by disabling some and measuring the results.

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jeroen13 avatar image jeroen13 commented ·

Will try that, only then I cant operate my ESS because it uses that grid meter.

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nickdb avatar image nickdb ♦♦ jeroen13 commented ·
We’ve seen similar with shelly meters. Can you adjust the rate it reads at?
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Alex Pescaru avatar image Alex Pescaru nickdb ♦♦ commented ·

If it was that simple...

But the communication through / with mqtt is different from the one used for shelly




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jeroen13 avatar image jeroen13 Alex Pescaru commented ·
The read out of the API is done at 1 sec intervals in Node-Red
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jeroen13 avatar image
jeroen13 answered ·

I reinstalled the dbus-mqtt-devices this morning and somehow it seems to have fixed the issue, so fingers crossed coming day to see if it stays that way.

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