Incorrect AC Loads calculation on MultiPlus-II when no current-sense bridge or sensor is connected

DIY
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1

Venus OS: v3.80

Expected behavior

The Ekrano GX should calculate AC Loads based only on the actual power measured on AC OUT of the MultiPlus-II.

When no external current-sense sensor is connected and no wire bridge is installed between the INT and COM terminals of the MultiPlus-II current-sense input, the AC Loads calculation should not include power flowing from solar PV to AC IN (to the grid).

In other words, power exported to the grid should not be added to the AC Loads value.

Actual behavior

When no wire bridge is installed and no current-sense sensor is connected, the Ekrano GX incorrectly adds the solar power being exported to the grid to the reported AC Loads.

For example, if the actual AC Loads are approximately 350 W, but 1,000 W is being exported to the grid, the Ekrano GX can report approximately 1,350 W of AC Loads.

This results in an incorrect AC Loads value and consequently incorrect power-flow information elsewhere in the system.

I understand that the current-sense input should normally have either the appropriate wire bridge or a sensor installed. However, if neither is present — or, as in my case, the bridge wire has a faulty connection — the system produces misleading AC Loads values.

This makes troubleshooting particularly difficult because the displayed AC Loads no longer correspond to the actual loads connected to AC OUT.

Suggested behavior

If no current-sense sensor is detected and the INT-COM bridge is not installed, the Ekrano GX should not add AC IN/grid feedback power to the AC Loads calculation.

At minimum, the system should avoid reporting power as AC Loads when that power is actually being exported to the grid and is not present on AC OUT.

The current behavior appears to result in physically impossible or misleading load values, which can make diagnosing ESS and power-flow problems considerably more difficult.

2

I don’t quite understand,

I think this is the problem: power isn’t measured at ACout, but calculated. Without the sensor at ACin, the Multi is flying blind, whether or not there’s an external smart meter.

3

Something’s just wired up wrong or configured incorrectly.

Is PV actually defined as PV?

4

If the wire jumper is broken, something’s wrong — fix it and that’s that.

Or do you expect a car with a flat tyre to run normally?

Without a wire jumper AND without a sensor: unsupported configuration. It’s great that it runs at all — but that’s just luck.

Technically, what YOU have in mind won’t work — because an essential measured value is missing when the sensor input is open.