Venus OS supports several types of energy meters, some of which are stocked by Victron and others that need to be purchased from the manufacturers directly, such as Carlo Gavazzi or ABB.
The Energy Meters are used in systems with a GX device to measure the output of a PV Inverter, an AC Genset, or as a Grid Meter in an ESS installation. It also can be used to measure AC loads.
Most of the Energy Meters connect to a GX device via RS485 either through a wired connection via our RS485 to USB interface or wirelessly via our Zigbee to USB and Zigbee to RS485 converters. Its data is then displayed on a GX device and our VRM portal. Alternatively, the EM24 Ethernet meter can be used, provided the meter connects to a local network in such a way that the GX device can reach it.
To make a selection, first, decide if you need a single- or three-phase meter:
Which Energy Meter should be selected depends on the installation, the number of phases you want to measure and the maximum current per phase. Examples: For a three-phase utility connection, use a three-phase meter. For a three-phase PV Inverter, use a three-phase meter as well. For a single-phase utility connection, use a single-phase meter. And in an installation with a single-phase utility connection, that also has a PV Inverter that needs measuring with an energy meter, then you can use two pieces of ET112 or use the ET340. If the application exceeds the max. current rating, use an Energy Meter with current transformers. Note that most PV Inverters feature “direct readout” by the Victron system and thus don’t need their output to be measured by an energy meter.