SMA SSM16-11 - Manual (Page 50)

9 Configuring the Sunny String-Monitor via Sunny Central Control SMA Solar Technology AG
50 SSM16-24-IA-IEN105120 Installation Guide
9.3 Setting the Parameters for the String Current Monitoring
9.3.1 Setting the Number of Strings per Measuring Channel
The number of strings per channel for the eight measuring channels can be selected from 1 to 4. The
default setting is "1". The maximum number of strings per channel is limited to 4.
The ideal number of strings for each measuring channel is 2. Depending on the system design it is
possible to connect more strings in parallel outside the Sunny String-Monitor and append them to a
measuring channel (see section 6.5.3 ”Connecting the Data Cable in the Sunny String-
Monitor”, page 37).
In the submenu No. of Str. All you can assign all channels of the Sunny String-Monitor to a string
number of 1 to 4.
1. Select Device Set-up > SMUs > Devices > Parameters.
2. Select the String Monitor Unit you want.
3. In the submenu No. Of Strings or No. of Str. All set the number of strings connected per
measuring channel used.
9.3.2 Setting the Groups
With Sunny Central Control one can subdivide the individual measuring channels of the connected
String Monitor Units into 3 groups, to make it possible to compare only the measuring channels which
have the same properties. The groups are monitored independently of each other, and each
individual measuring channel can be allocated freely to any group. An individual group must include
at least 4 measuring channels.
In the Group all chan. all the measuring channels of the String Monitor Unit can be assigned to a
group.
If you wish not to include individual channels from the String Monitor Unit in the string current
monitoring, these must be assigned to the 0 group, since string current monitoring is deactivated for
this group. This way, this measuring channel is not included in the mean value calculation.
1. Select Device Set-up > SMUs > Devices > Parameters.
2. Select the String Monitor Unit you want.
3. In the Group channel or Group all chan. submenu, set the group numbers for individual
measuring channels or for all of them.
No strings in a measuring channel
• If there are no strings connected to a measuring channel, assign this channel to the
0 group (see section 9.3.2 ”Setting the Groups”, page 50).