SMA SUNNY ISLAND 8.0H - Setting Load-Dependent Generator Request

SMA Solar Technology AG 7 Commissioning
Installation Manual SI80H-60H-OffGrid-IA-en-11 109
7.17.4 Setting Load-Dependent Generator Request
Significance of load-dependent generator request:
If you activate the load-dependent generator request, the off-grid inverter requests the generator in
the event of a high load. This prevents deep discharge and cycling of the battery and extends its
electrical endurance. The output power of the off-grid system for supplying the loads increases to the
total of the generator power and the power of the off-grid inverter. This improves the system stability.
The load is the calculated average output power of the off-grid inverter.
Loads in the three-phase off-grid system:
The generator management considers the total load of all line conductors. It does not monitor
individual line conductors in the three-phase off-grid system. If the switch-on power limit is exceeded
for one line conductor, the generator management requests the generator.
Time sequence of load-dependent generator request:
If the switch-on power limit is reached, the generator management requests the generator. If the load
then reduces to the switch-off power limit, generator management resets the generator request after
the minimum run time. Generator management calculates the average load during the averaging time
235.12 GnPwrAvgTm. The greater the averaging time that you set, the less generator management
reacts to load peaks.
Generator run times:
The warm-up, minimum and shut-off delay times are adhered to after the generator start. The power
from 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 shut-off delay time.
1. Switch to expert mode (see Section 7.6).
2. Select the 235.09 GnPwrEna parameter and set it to Enable. This activates load-dependent
generator request.
3. Select the 235.10 GnPwrStr parameter and set it to the switch-on power limit.
4. Select the 235.11 GnPwrStp parameter and set it to the switch-off power limit.
5. Select the 235.12 GnPwrAvgTm parameter and set it to the averaging time that the generator
management uses to calculate the average power.