question

Lyndsay Cotton avatar image
Lyndsay Cotton asked

Screen layout on VRM not showing AC2 out loads separately from AC1 out

This question may answer part of another question I posted two days ago.

The VRM layout for the Multiplus 2 looks like the Screenshot document below


However, the second image reflects the actual layout

Surely the VRM portal (and remote console / Colour control) should rflect the actual statof the Multipluss wherein

AC1 = Critical loads (No break loads) - Green on image

AC2 = loads connected to AC2 of multiplus - Blue on image

"High loads" - Red load on Image


It is somewhat confusing as to what AC loads and Critical loads actually mean on the current VRM portal layout especially the "flow" of current depicted by the blue dashes.

Does "critical loads" (1846w for clarity) mean AC1 out and AC2 out

Does "AC loads" (0 w for clarity) mean the bidirectional load which is fedback into the grid but consumed by the "red" high loads?



vrm-snip-from-phone.pngvrm-layout.jpg

VRMremote console
vrm-snip-from-phone.png (51.0 KiB)
vrm-layout.jpg (99.1 KiB)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

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

1 Answer
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @Lyndsay Cotton,

It is a limitation of the MultiPlus hardware that it cannot seperate AC1 out and AC2 out loads as independent measurements.

The power supplied to AC1 out and AC2 out are combined, and shown as such in VRM (and it can be no other way).

AC Loads in VRM, shown on the Grid side of the Multi are those loads that are communicated to the GX by an external energy meter (such as the ET112).

This allows the system to detect a difference on the AC input side between grid import, grid export and loads on the grid.

In your single line diagram example of your system, the multi knows how much it is pushing or pulling from the AC input, and thanks to the ET112 energy meter, it knows how much is coming or going from the grid. The difference between those two allows us to calculate the red 'high loads' on AC1 input as shown in your diagram.

If you want to see the AC2 loads, and measure them as separate to NO break / Critical AC1 output loads, then you should move those loads from AC2 out Loads, and instead have them connected to the AC1 input between the Multi and the grid meter.

They will then appear as AC loads in VRM.

7 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

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

Lyndsay Cotton avatar image Lyndsay Cotton commented ·

Thankyou - so in my screenshot above both AC1 out and AC2 out are seen as critical loads. Happy with the clarification.


I suppose I could add another ET112 to AC2 Out if I wanted to

In a hypothetical situation - could I add a number of ET112's to the system? - and control some high loads via the venus (and relay)

0 Likes 0 ·
Show more comments
Lyndsay Cotton avatar image Lyndsay Cotton commented ·

Following on then from the above - the following two questions

@Guy Stewart (Victron Community Manager)

Question 1:

1. Being multidirectional and the ET112 is placed in the position as per my schematic - ie: "Red" high loads being AFTER the ET112 but before the Multi - how does the Multi determine to feed back to the "Red" high loads if the Multi has been setup to NOT feed back into the grid?

This is not quite like a water pipe :) where a solonoid valve will close the pipe at the ET112 and allow the flow to the "Red" loads


Question 2:

2. Say it is a Multi 48/5000. This means that the continuous load should not exceed 4kw.

This will then be on a combination of AC1 (out) and AC2 (out). So I would design loads on the combination of AC1 out and AC2 out to not exceed 4kw

Does the bi-directional load (ie: the "feedback" load) not be part of this 4kw limit.

0 Likes 0 ·
Show more comments

Related Resources

Additional resources still need to be added for this topic