6 Electrical Connection SMA Solar Technology AG
54 SI80H-60H-OffGrid-IA-en-11 Installation Manual
7. Connect the BatCur– measuring wire to the battery
DC‒ side on the battery current sensor.
6.18 Assignment of Multi-Function Relay
Possible function/output Explanation
Controlling generators In case of a generator request, the multi-function relay switches to
the NO position. With the multi-function relay, you can control
generators with electrical remote-start function or connect a signal
generator for generators with no autostart function.
Control of load-shedding
contactors
Depending on the state of charge of the battery, the multi-function
relay switches to the NO position. Depending on the
configuration, you can install 1-level load shedding with one multi-
function relay or 2-level load shedding with two
multi-function relays. You can also adjust the limiting values for the
state of charge of the battery depending on the time of day.
Time control for external
processes
The multi-function relays can be switched in a time-controlled
manner (see Section 7.8).
Display of events and warning
messages
Every multi-function relay can display one event or one warning
message (see Section 6.24).
Control of a battery-room fan If the charging current leads to the emission of gases from the
battery, the multi-function relay switches to the NO position. The
connected battery-room fan is switched on for at least one hour.
Control of an electrolyte pump Depending on the battery cycles, the multi-function relay switches
to the NO position at least once a day.
Use of excess energy During float charging, a multi-function relay switches to the NO
position and thus controls additional loads which can put any
excess energy to good use.
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