7 Commissioning
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
98
Set the switch-on limits (lower SOC thresholds) for the standard time period and the additional
time period
1. Select
Generator > Generator queries state of charge > Additional time range > Switch-on limit in time
range
.
2. Set the parameter
Generator startup battery state of charge limit
to the lower SOC threshold during the
standard time period.
3. Set the parameter
Limit battery state of charge generator start in add time range
to the lower SOC
threshold during the additional time period.
Set the switch-off limits (upper SOC thresholds) for the standard time period and the additional
time period
1. Select
Generator > Generator queries state of charge > Switch-off limit in time range
.
2. Set the parameter
Generator shutdown battery state of charge limit
to the upper SOC threshold during the
standard time period.
3. Set the parameter
Limit battery state of charge generator stop in add time range
to the upper SOC
threshold during the additional time period.
7.8.4.4
Configuring the Load-Dependent Generator Request
Relevant for off-grid systems
The basic procedure for changing operating parameters is explained in another section (see Section 8.6, page 113).
Significance of the load-dependent generator request:
If you activate the load-dependent generator request, the Sunny Island requests the generator in the event of a high
load. This prevents the battery from deep electric discharging and cycling and extends its service life. The performance
of the off-grid system for supplying loads increases to the sum of the generator power and the power of the
Sunny Island inverter. This improves the system stability. The load is the average output power of the Sunny Island
inverter.
Loads in a three-phase system:
The generator management considers the total load of all phases. It does not monitor single phases in three-phase
systems. If the switch-on power limit is exceeded, the generator management requests the generator.
Time-based procedure of the load-dependent generator request:
If the switch-on power limit is reached, the generator management requests the generator. If the load then drops to the
switch-off power limit, the generator management resets the generator request after the minimum run time. The
generator management does not record the load as an instantaneous value. The generator management calculates the
load across the averaging time. The longer the averaging time set, the less the generator management reacts to load
peaks (parameter:
Generator > Time-controlled generator operation > Average time for generator request
via power
).
Generator run times:
The warm-up, minimum and power-down times are adhered to after the generator start. The power of the generator is
not immediately available in the stand-alone grid. Each start also means that the generator runs for at least the warm-
up time, minimum run time and power-down time.
Procedure:
1. Select
Generator > Generator request via power
.
2. Set the parameter
Generator request via power on
to
Enable
. This will activate the load-dependent generator
request.
