Additional Connections; Signaling Contact - SMA Sunny Island SIC50-MPT Installation Manual

Electrical Connection
6.7 Additional Connections
6.7.1 Signaling Contact
You can connect a signaling contact to your charge controller that automatically closes in case of
battery overvoltage (battery voltage > 65 V).
The signaling contact operates like a make contact and can be loaded with voltages of up to 200 V
(DC) and a contact load of 1 A/15 W.
NOTICE!
If a switch in the charge controller short circuits, the battery may be irreparably
damaged.
If a short circuit occurs in the charge controller, the battery is no longer protected against
overcharging.
• SMA Solar Technology AG recommends using the signaling contact to ensure that,
in case of a failure, the battery is disconnected from the charge controller by a relay
or contactor.
• If several charge controllers are connected to the stand-alone grid system, a signaling
contact must be connected between each charge controller and the battery.
Cable Requirements
Signaling Contact Cable
To maintain the IP65 protection rating, use a cable with an outer diameter of 5 mm - 7 mm
to connect the signaling contact.
30 SIC50-IA-en-11
SMA Solar Technology AG
Installation Guide