Optional Devices And Functions - SMA SUNNY ISLAND 3.0M Quick Reference Manual

3 Information and System Description
Information on the PV System
Maximum PV system power
In off-grid systems, the maximum PV system power depends on the total power of the Sunny Island inverters.
• Maximum output power of the PV system per SI3.0M-11: 4600 W
• Maximum output power of the PV system per SI4.4M-11: 4600 W
• Maximum output power of the PV system per SI6.0H-11: 9200 W
• Maximum output power of the PV system per SI8.0H-11: 12000 W
The maximum output power of the PV system must be observed to ensure stable operation of the off-grid system.
3.4

Optional Devices and Functions

The following devices can be used optionally in an off-grid system:
Component
Load-shedding contactor
Sunny WebBox
Sunny Island Charger 50
Battery current sensor
Sunny Island offers the following functions for off-grid systems via two multifunction relays (see the Sunny Island
inverter installation manual):
Function
Controlling PV arrays
Controlling load-shedding con-
tactors
Time control for external pro-
cesses
16 Off-Grid-IS-en-33
Description
Contactor controlled by the Sunny Island for isolation of loads
Remote monitoring and system configuration of the off-grid system
Charge controller for off-grid systems with lead-acid batteries
A maximum of four Sunny Island Charger charge controllers can be connected
to a cluster. In multicluster systems, four Sunny Island Charger charge controllers
can be connected to each cluster. If lithium-ion batteries are used, no charge con-
trollers can be connected.
Shunt for measuring the battery current
A battery current sensor is required in off-grid systems with DC loads or with
charge controllers from third-party suppliers (see Section 2.1 "Intended Use",
page 7).
Description
A multifunction relay activates if a PV array request is received from the Sunny Is-
land inverter's generator management system. With the multifunction relay, you
can control PV arrays with an electrical remote-start function or connect a signal
generator for PV arrays with no autostart function.
A multifunction relay is activated depending on the state of charge of the battery.
Depending on the configuration, you can install a one-level load shedding with
one multifunction relay or a two-level load shedding with two multifunction relays.
You can also adjust the thresholds for the state of charge of the battery depend-
ing on the time of day.
External processes can be time-controlled with a multifunction relay.
SMA Solar Technology AG
Quick Reference Guide