When grid drops, System grid (w) node sends null instead of zero.

[SergioRius]

In this case provokes a crash in the following nodes. Just curious if that's expected. Could be easily (not straightforward) corrected in after process.

[dirkjanfaber]

Inserting a function node, containing:

if (! msg.payload) {
    msg.payload = 0;
}

return msg;

will replace the null value with a zero.

But I am going to try to get some more background information on this.

[dirkjanfaber]

We want to differentiate between "device is not providing data" (null payload) and "device is measuring 0W" (0 value). So this is planned behavior. You can expect the null value to remain possible in future updates.

[SergioRius]

Inserting a function node, containing:

Yes, or a change node to follow with:

We want to differentiate between "device is not providing data" (null payload) and "device is measuring 0W"

OK. Just for clarification, I'm referring here to the inner AC measurements of a Multiplus2 when it "AC Ignores" the grid. No external meter involved.