Generator Run Times - SMA SUNNY ISLAND 8.0H Installation Manual

10 External Energy Sources in the Off-Grid System
Generator request
Time-controlled generator
request
Charging-process-dependent
generator request
10.7.3 Generator Run Times
The generator run times specify the time frames for generator mode. The generator run times are only
interrupted in the event of a fault. As a result, the generator management can operate the generator
with as little wear as possible and in an energy-efficient manner. This increases energy efficiency by
allowing the generator management to use an operating generator for as long as possible with high
generator efficiency.
You can adjust and optimise the run times depending on the generator and the requirements on the
off-grid system.
Generator run time
Warm-up time
Minimum run time
Shut-off delay time
Minimum stop time
132 SI80H-60H-OffGrid-IA-en-11
Explanation
You can set the days, times and durations for generator request
by the generator management.
The generator is requested for full charge and equalisation
charging. You can configure whether the generator is requested
for full charge, equalisation charge or both charging processes.
Explanation
To avoid loading the generator when it is cold, the generator
warms up during the warm-up time. In this way, generator wear is
reduced. After the warm-up time has elapsed, the off-grid inverter
switches the stand-alone grid to the generator voltage.
The minimum run time begins after the warm-up time has ended.
During the minimum run time, the generator supplies current in
order to charge the battery and to supply power to the loads. The
minimum run time prevents short generator run times.
When the minimum run time has elapsed and the reason for the
generator request no longer exists, generator management
disconnects the generator from the stand-alone grid. The shut-off
delay time starts after this disconnection. During the shut-off delay
time, the generator operates without a load and the equipment
slowly cools down.
The minimum stop time begins after the shut-off delay time. During
the minimum stop time, the generator remains stopped. In this
way, the generator management avoids frequent generator starts.
Frequent starts result in faster wear of the generator motor.
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