Multi RS

The Victron VM-3P75CT energy meter can be used with the Multi RS.

The Victron energy meter can be connected using either VE.Can or Ethernet. A GX device is required for Ethernet connectivity. See example diagrams below.

See the VM-3P75CT manual for full details.

The energy meter can be configured for single phase or three phase systems.

Once the role is selected in the energy meter settings, then energy meter support can be set in the Multi RS settings:

Energy meter support: Toggle this switch on to enable a grid energy meter to be used in this system. This will allow loads between the grid energy meter and the AC-input terminals of the Multi RS to be supplied by the Multi RS. Note The energy meter role needs to be configured as a "Grid" meter. AC current limit at energy meter: This value will set the maximum current limit at the point that the energy meter is installed. Loads between the energy meter and the Multi RS will be supplied by the grid until the set limit is reached. After this, the Multi RS will begin to "power assist" in order to maintain the set current limit. Current limit at AC input: This setting determines the maximum current allowed at the AC input terminals of the Multi RS. It limits the AC current for loads on AC out 1 and battery charging. Loads on AC Out 1 will continue to be supplied by the AC input, but if the current limit is reached, the Multi RS begins to "power-assist" using energy from the battery. Current limit overruled by remote: Enable this option to allow the current limit to be adjusted remotely. For example, a GX device can be used to adjust the current limit remotely. It is not possible to remotely set the current limit any higher than the level defined here.

The above wiring example can be used when the energy meter role is set up as "Grid meter" or "Generator". The incoming current from the AC grid or a generator is measured before the AC input of the Multi RS, or any non-critical AC loads.

If "Energy meter support" is enabled, a current limit can be set at the energy meter to prevent excessive load on a weak AC grid. If the non-critical loads exceed the current limit at the energy meter then the Multi RS will begin to "power assist" to try and maintain the current limit at or below the set point.

If a generic PV inverter is connected to the AC output of the Multi RS the energy meter role should be set to "PV Inverter" and wired to measure the current produced by the PV inverter.

When the energy meter role is set to "AC load" then the energy meter can be wired to measure specific loads. For example, a water heater circuit could be measured to monitor its power consumption and also track the amount of energy it uses.