question

andrii-podanenko avatar image
andrii-podanenko asked

How to Prevent MultiRS from getting ~100W(fluctuating) from the Grid?

I have em24 3phase power meter
MultiRS Dual Tracker on L3
It is always getting some power from grid
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How can I prevent it from getting this from grid?

Multi RSess grid setpoint not reached
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1719574575396.png (195.1 KiB)
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4 Answers
Alex Pescaru avatar image
Alex Pescaru answered ·

Hi @Andrii Podanenko

As the grid is permanently connected and because of the hardware design of the Multi RS where the AC In is almost a direct line/connection to AC Out, the Multi RS, in order to compensate for the power consumption variations and to keep grid consumption to zero, it continuously tries to fine tune it's frequency in order to be ahead, behind or exactly on the grid waveform in order to apply the Kirchhoff's circuit laws in AC domain. We are dealing here with rotating vectors (phasors), because voltages in AC circuits add as vectors, not numbers.

Now, with a variable uneven and distorted grid waveform and with, sometimes, reactive load(s) those variations appear.

Don't think you can do anything, because making the Multi RS more active and responsive to those power variations and compensations will be more stressful for all the components...

Alex

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andrii-podanenko avatar image andrii-podanenko commented ·

Maybe I can change em24 to VM-3P75CT in order for the system to behave faster.

But overall - thank you for the explanation.

This is why I still keep King 5k before Victron, which makes possible to have 0W usage, because of double AC->DC->AC conversion hardware design

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Alexandra avatar image
Alexandra answered ·

@Andrii Podanenko

You can set an AC ignore function in the settings.

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andrii-podanenko avatar image andrii-podanenko commented ·

Where exactly can I find this settings in MultiRS? @Alexandra

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andrii-podanenko avatar image andrii-podanenko Alexandra ♦ commented ·

When MultiRS opens a relay - VRM is not getting data from em24 meter into a system. It behaves like no AC grid meter.

Doesn't fit in what I want to have

I want 0 consumption when there is plenty of battery and solar

Currently it uses up to 2kWh daily from grid, which is not ok
@Alexandra

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Alexandra avatar image Alexandra ♦ andrii-podanenko commented ·
Not much i can do about that.

Usually the RS on my system draws maybe 15w.

You must have alot of reactive power in the system for it to be all over the place.

The grid set point is not editable.

How do you have your battery set to cycle?

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andrii-podanenko avatar image andrii-podanenko Alexandra ♦ commented ·

> The grid set point is not editable.
it is editable via NodeRED, instead

  • /Ess/UseInverterPowerSetpoint

not editable just yet.

Waiting for the new firmware and Venus to land anytime soon

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Alexandra avatar image Alexandra ♦ andrii-podanenko commented ·
Yeah, not editable ...the just yet - very keen to watch the product develop.


Even if you could edit it, grid quality and load and reactive power would make it interesting to keep.

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andrii-podanenko avatar image andrii-podanenko Alexandra ♦ commented ·
I have Shunt for battery and 28.5kWh lifepo4 16s behind it
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Evgeniy Labunskiy avatar image
Evgeniy Labunskiy answered ·

The way I found to manage this is to enable Conditional AC Input

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andrii-podanenko avatar image andrii-podanenko commented ·
Then it ignores grid meter completely when AC is not connected
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Duivert NL avatar image
Duivert NL answered ·

you can change gridsetpoint in ESS but it will always try to balance on grid

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andrii-podanenko avatar image andrii-podanenko commented ·

This is MultiRS, there is no gridsetpoint in settings yet

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Duivert NL avatar image Duivert NL andrii-podanenko commented ·
Yes your right! Sorry, i have multiple multiplus 2 inverters
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andrii-podanenko avatar image andrii-podanenko Duivert NL commented ·
On multiplus - different story, true :)


Will wait for the 1.17 firmware for MultiRS

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Related Resources

Mutli RS Solar Datasheet

Mutli RS Manual


Additional resources still need to be added for this topic