SMA SSM16-11 - Manual (Page 57)

SMA Solar Technology AG 10 Configuring the Sunny String-Monitor with Sunny Data Control
Installation Guide SSM16-24-IA-IEN105120 57
10.3.2 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. Nevertheless one can, depending on the
system design, 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. This avoids having to set the number of strings for each of the individual channels,
since this is automatically set for all the individual channels.
1. Select the String Monitor Unit you want in the plant tree.
2. In the "Parameters" area, click No. Of Strings for the desired channel, or No. of Str. All.
3. In the area "Channel value", enter the number of PV strings per channel or for all channels.
4. Select [Set]. This saves the setting.
10.3.3 Setting the Groups
You can subdivide the individual measuring channels of the connected String Monitor Units into 3
groups, to make it possible to compare 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. This avoids having to allocate the individual measuring channels to a group as this then occurs
automatically for all the individual measuring channels.
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 the String Monitor Unit you want in the plant tree.
2. In the "Parameters" area, select Group channel for the desired channel, or Group all chan.
3. In the area "Channel value", enter the number the group per channel of for all channels.
4. Select [Set]. This saves the setting.
10.3.4 Setting the Monitoring Period
You can define a monitoring period for each individual measuring channel on the Sunny String-
Monitor. This allows you to filter out temporary effects such as shading on individual strings.