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SMA Solar Technology AG
2 Safety Instructions
2.1 Appropriate Usage
The charge controller is a DC/DC converter that reduces the direct current of the PV array to the direct
current of a battery in order to charge it. The SIC50-MPT replaces the SIC40-MPT.
The charge controller can be operated in two different operating modes:
SMA operation
The "SMA" operating mode must be selected if
the charge controller is operated in a system
equipped with a Sunny Island 5048/2012/
2224.
Section 6.1.1 "Operating mode" (28) explains how to set the operating mode.
In SMA operating mode, the Sunny Island protects the battery from deep discharge. In stand-alone
operating mode without Sunny Island, an external device must protect the battery from deep
discharge.
The charge controller may only be operated with PV array (modules and cabling) of protection class
II. Do not connect any sources of energy other than PV modules to the charge controller.
Already when designing the PV plant, ensure that the values comply with the permitted operating
range of all components at all times. The maximum open circuit voltage of the PV array may not be
greater than the maximum input voltage of the charge controller (140 V), even at very low ambient
temperatures. The voltage of the PV array must always be at least 5 V higher than the battery voltage
during operation. The charge controller is suitable for battery currents of up to 50 A at 48 V/24 V/
12 V nominal battery voltage.
The suitability of a PV array for the charge controller primarily depends on the output voltage and
output power of the PV array. In this regard, observe the limits specified by the module manufacturer.
Appropriate usage also includes observing all documentation.
Installation Guide
Stand-alone operation
The "Stand-alone" operating mode must be
selected if the charge controller is operated in a
stand-alone grid system equipped with a
Sunny Island 3324/4248 or without a
Sunny Island.
Safety Instructions
SIC50-IA-en-11
9
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