SMA Solar Technology AG Connecting External Sources
Technical Description SI5048-TEN093630 111
Load Dependent Start
In case increased energy demands arise, the generator can be requested for support. This function
can be switched on or off (default) using the "235.09 GnPwrEna" parameter. The function is only
effective if the "235.01 GnAutoEna" parameter is simultaneously set to On.
The load limit for the request and the generator stop is configured using the "235.10 GnPwrStr" and
"235.11 GnPwrStp" parameters. The average time by which an average value for the consumer
power is calculated can be set using "235.12 GnPwrAvgTm". This prevents temporary power
consumption peaks of a few seconds from causing a power-dependent generator start.
If the generator has been started due to the load, it runs according to the minimum generator run time.
If, once this time has expired, the average power is below the cutoff limit, the generator is stopped
again.
The following process diagrams provide an overview of the start/stop behavior of the Sunny Island
during automatic generator operation:
Generator Interface "234.07 GnSrtMod" = Manual; Generator Request by
Sunny Island
Multiple-phase system
Only the total consumer power of all phases is monitored. Individual phases in a multi-
phase system are not monitored.
The consumer power is calculated using the inverter power ("111.01 TotInvPwrAt"
parameter) and generator power ("131.01 TotExtPwrAt" parameter).
1 Generator is requested via Sunny Island
2Manual generator start
3 "Generator is running" detected, beginning of warm up phase
4 Warm up phase is completed, connection
5 Generator current limit
6 Minimum run time has expired
7 Current is reduced, battery absorption phase
8 Charging process is completed, request signal is disabled
9Manual generator stop
10 Generator is disconnected
11 Stop time has expired
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