Why does 0.1A not appear in AC power?

Question

question

johnny-brusevold asked Mar 10, '22

Why does 0.1A not appear in AC power?

Test with load of 0.35A

Trying to learn some python programming, but there's something I do not understand here. Thinking that this must be somewhere else in the code for energy measurement.

When I check with dbus-spy, nothing appears under Amp.

In the program, if I switch to factor of 10, 3.5A is displayed in debus-spy, but only 3.0A in Remote Console.

If I change to a factor of 0.1, 0.035 is displayed in debus-spy and nothing in the Remote console.

Is there anyone who can lead me in the right direction?

Energy Meter

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2022-03-10T22:24:54Z

Kevin Windrem answered · Mar 10, 2022 at 10:24 PM

It is possible the GUI code is taking only the integer part of the value so anything under 1 amp would show as 0. Most of the GUI code is written in QML and files are in /opt/victronenergy/qui/qml. Within that directory, the files conform more or less to the menu that appears in the GUI. File names for overviews begin with Overview...

I suspect you'll find the parameter in question will be processed through .format(0) which formats the number with no fractional components. If it were .format(1) instead, you should see a value of 0.3.; .format(2) would output 0.35, etc. There are other formatting methods used as well, some automatic or build in to the object. For example a dbus parameter name with .text appended to it may format a number in a way built into the object. I'm not sure where that built-in formatting is written.

1

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

johnny-brusevold commented · Mar 11, 2022 at 10:27 AM

@Kevin Windrem

Thanks for the detailed explanation.

There was no change in the displayed values even though I change the code to the correct value. There is a lot I have to learn first, before I see the whole of this system.

0 ·

question