Multi RS Solar Firmware version v1.17 - VM-3P75CT

DIY
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Can anyone enlighten me as to what the support for the VM-3P75CT is on the new 1.17 firmware?

I can enable it in the settings but I’m not going to do this until there are some details of the consequences.

Does it allow for loads between the RS and the VM-3P75CT to be powered without importing energy into the grid?

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@guystewart could you add any details?

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Hi @JohnHolmes,

This v1.17 firmware release provides initial support for the VM-3P75CT Energy Meter for the 2 tracker model of the Multi RS (among other changes).

We are building towards full ESS support for the 2 tracker Multi RS but we are not there yet.

While this is a production release, you may wish to wait for more complete information before proceeding.

For now the available details are:

The Multi RS will be aware of the loads between the grid and the AC input, and if the Grid meter is correctly configured, and will supply power to them without feeding into the grid.

There is not yet grid code support, so feed-in is not yet permitted.

There is a 10W power draw added from the utility grid: this is a safety margin to compensate for measurement inaccuracies to prevent feeding energy into the utility grid.

Anti islanding protection is based on IEC 62116:2014 ‘Test procedure of islanding prevention measures for utility-interconnected photovoltaic inverters’,

Regulating sum of all phases to zero works for a three phase system with a single RS, but not yet for a three phase system with three phase RS system

Installation Steps:

  • The Multi RS and the energy meter must both be connected to the same VE.Can bus (ethernet isn’t supported yet).
  • Make sure the current transformers are installed with the correct polarity; energy consumption from the utility should show as a positive number.
  • Check the Multi RS system instance is set to the default value of 0.
  • The energy meter type should be set to ‘Grid meter’ in the VictronConnect app.
  • Enable energy meter support on the Multi RS using the VictronConnect app.

Specifics for 3 phase setups:

  • 3 phase utility with just 1 RS: it controls the sum of all phases to the grid set-point.
  • 3 phase utility with 3 RS units: each phase is controlled individually to the grid set-point. The (more commonly asked for) option to regulate the total of all phases to zero is coming next.
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Thanks for the quick reply! That looks interesting and it’s a good step forward.
From my perspective I currently have two dual tracker Multi RS solar units connected to my main meter with the energy meter attached. They both feed different output devices at present with one powering a water heater, the other powering my house board.

I take it that without any form of parallel support I can only enable one of the two RS units to use the energy meter? Or would enabling both be ok? I’m thinking of moving some devices to the input side of the board depending on where we are with the firmware.

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