SMA Solar Technology AG
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Technical Description
SI5048-TEN093630
109
14.1.5 Automatic Generator Operation
In automatic operating mode ("235.01 GnAutoEna" parameter), the Sunny Island automatically
defines the settings (as a function of battery charge state or loads) to determine when the generator
starts and how long it runs. The automatic operating mode is activated using GnAutoEna = On
(default). If GnAutoEna = Off, the automatic operating mode is deactivated.
In addition, the user can also manually start and stop the generator, if required.
Charge State Dependent Start
The time periods t1 and t2 are defined using the "235.07 GnTm1Str" and "235.08 GnTm2Str"
parameters. The start time for t1 (and thus the end of t1) is defined using GnTm2Str, and the start time
for t2 (end of t2) is defined using GnTm1Str.
The time intervals t1 and t2 are assigned charge states for start-up and stop with the
"235.03 GnSocTm1Str", "235.04 GnSocTm1Stp", "235.05 GnSocTm2Str" and "235.06
GnSocTm2Stp" parameters. GnSocTm1Str designates the battery charge state at which the generator
is started during the t1 time and GnSocTm1Stp designates the charge state at which the generator is
switched off during t1. The GnSocTm2Str and GnSocTm2Stp parameters are similarly defined during
the time t2.
The following figure shows an example of the settings if operation of the generator at night is to be
avoided as much as possible. Between 6 a.m. and 22 p.m., the generator is started at a charge state
(SOC) of 40 % and by contrast, the battery is discharged to 22 % at night (between 6 p.m. and
30 a.m.) before the diesel generator starts.
NOTICE!
The Sunny Island changes to the operating mode "Stop/Lock" when stopped
manually during automatic operation.
• Manual inputs on the Sunny Island have a higher priority than automatic operation.
• If the Sunny Island is manually stopped while the automatic operating mode is
activated it switches to stop/lock operating mode.
• If Generator Automatic Start is activated and the conditions for automatic operation
are met, the Sunny Island changes back into the Start operating mode after lock time
(or manual acknowledgment with the "540.02 GnAck" parameter).
GnTm1Str = GnTm2Str
If GnTm1Str = GnTm2Str, only t1 is activated!
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