Victron energy Phoenix MultiPlus 12/3000/120 Manuel page 26

Multi-functional relay
By default, the multi-functional relay is set as an alarm relay, i.e. the relay will de-
energise in the event of an alarm or a pre-alarm (inverter almost too hot, ripple on the
input almost too high, battery voltage almost too low). Not adjustable with DIP
switches.
VirtualSwitch
The VirtualSwitch is a software function in the MultiPlus microprocessor. The inputs of
this function are parameters that can be selected with VEConfigure (e.g. certain
alarms or voltage levels). The output is binary (0 or 1). The output can be connected
to a binary microprocessor output (e.g. the multi-functional relay, or the relay in one of
the AC inputs).
If connected to the multi-functional relay, and with battery voltage and time as input
values, for example, the VirtualSwitch can be configured to supply a generator starting
signal.
If connected to an AC input relay, and with battery voltage and time as input, for
example, the connected mains supply can be interrupted.
Application: autonomous operation when the grid fails
Houses or buildings with solar panels or a combined micro-scale heating and power
plant or other sustainable energy sources have a potential autonomous energy supply
which can be used for powering essential equipment (central heating pumps,
refrigerators, deep freeze units, Internet connections, etc.) during a power failure. A
problem is however that grid connected sustainable energy sources drop out as soon
as the grid fails. With a MultiPlus and batteries, this problem can be solved in a simple
manner: the MultiPlus can replace the grid during a power failure. When the
sustainable energy sources produce more power than needed, the MultiPlus will use
the surplus to charge the batteries; in the event of a shortfall, the MultiPlus will supply
additional power from the battery.
22