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Victron Current Sensors
A current transformer (CT) is a ring that clips around one AC conductor and gives a small signal proportional to the current flowing through it (50 mA at 100 A). It is not an energy meter: it does not measure energy, has no display and does not connect to a GX device. It plugs directly into the MultiPlus-II, into the external current sensor input.
What it is for. A MultiPlus-II only sees the current that passes through itself. When loads or a PV inverter are connected in parallel on the grid side (not behind the inverter), the MultiPlus-II cannot see them. A CT clamped on the grid connection lets it see the total grid current, which makes possible PowerControl (never exceed the grid fuse or the contracted power), PowerAssist (the inverter adds power at peaks, on top of what the grid delivers) and ESS (self-consumption optimisation in grid-connected systems).
CT or energy meter? The CT is inexpensive, wires straight into the MultiPlus-II and needs no GX device, but it works single-phase only and with at most 20 m of cable. A needs a GX device, also measures energy (kWh), works three-phase and over long distances (RS485/Ethernet). For single-phase ESS with one MultiPlus-II the CT is usually enough.
Versions. CTR11… = 3.5 mm jack plug, goes straight into the MultiPlus-II socket. CTR12… = wire ends, for MultiGrid-II or terminal connection. Cable lengths 1, 5 and 20 m. 100 A is the standard; 400 A for large grid connections. Not for the classic MultiPlus / Quattro — those use the AC Current Sensor (CSE000100000) at the end of the category, which measures the output of a PV inverter through the AUX input.
