Setting The Tolerance; Setting The Time Window; Setting Overnight Shutdown; Setting Anti-Theft Protection - SMA SUNNY STRING-MONITOR Technical Description

Accessories for central inverter

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SMA Solar Technology AG

8.3.4 Setting the Tolerance

Using the tripping time, you can set the sensitivity of the string current monitoring, since it is included

in the calculation of the error sum (see chapter 8.2 "Functionality of the String Current

Monitoring", page 48).

Since only a clear deviation of a measuring channel from a mean value is an indication of a faulty

string, whereas minor deviations can be considered normal, the tolerance value should be set

accordingly high.

1. Select "Device Set-up > SMUs > Parameters".

2. In the submenu Tolerance Grp, set the value per group.

8.3.5 Setting the Time Window

In order to filter out temporary effects (such as shadowing on an individual string, it is possible to

define a time window for every individual channel of the Sunny Central String-Monitor. For each time

window, the defined string will only be monitored starting at and until the respective times of day set.

TIP:

Under Monitoring On and Monitoring Off, one can set a specific time window for all measurement

channels of the Sunny String-Monitor for string current monitoring.

1. Select Device Set-up > SMUs > Devices > Parameters.

2. Select Sunny String-Monitor.

3. In the submenu under Monitoring On and Monitoring Off, set a specific time window per

measurement channel or for all measurement channels of the Sunny String-Monitor.

8.3.6 Setting overnight shutdown

Overnight shutdown in the Sunny Central is activated by default. Thus, the power supply to the

Sunny String-Monitors is deactivated in the Sunny Central as soon as the PV voltage has been under

250 V for one hour. The supply voltage is activated as soon as the PV voltage of 250 V is reached.

If overnight shutdown is deactivated, supply voltage to the Sunny String-Monitor remains on at night.

This means that theft protection can be activated and evaluated, see section 8.3.7 "Setting Anti-Theft

Protection", page 53.

1. Select Device Set-up > SMUs > Parameters.

2. In the submenu SMU Overn. Shut, set the nighttime disconnection.

8.3.7 Setting Anti-Theft Protection

Anti-theft protection is deactivated by default in Sunny Central Control.

1. Select Device Set-up > SMUs > Parameters.

2. In the SMU Theft. submenu, set the anti-theft protection.

Technical Description

8 Function of the String Current Monitoring

SSM-TEN103132

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