7 Commissioning SMA Solar Technology AG
114 SI80H-60H-OffGrid-IA-en-11 Installation Manual
If a set time for float charge has elapsed, the off-grid inverter switches to silent mode and the stand-
alone grid is supplied only by the electricity grid and the AC sources in the stand-alone grid. The off-
grid inverter exits idle mode at configurable time intervals or else when the battery voltage per cell
drops by 0.14 V. As a result, the battery always remains fully charged. If the electricity grid fails in
energy-saving mode, the off-grid inverter makes a stand-alone grid available for use within seconds.
1. Switch to expert mode (see Section 7.6).
2. To activate silent mode, set the values of the following parameters:
• Select the 224.01 SilentEna parameter and set it to Enable.
• Select the 224.02 SilentTmFlo parameter and set it to the maximum time for float charge.
• Select the 224.03 SilentTmMax parameter and set it to the maximum duration for energy-
saving mode.
3. To deactivate silent mode, select the 224.01 SilentEna parameter and set it to Disable.
7.23 Changing the Automatic Frequency Synchronisation
Automatic frequency synchronisation allows for the use of timepieces using the power frequency as
a timer. In this way, the power frequency dictates the accuracy of the timepiece. In the case of power
frequencies with ongoing frequency deviations from the rated frequency, the time indications will
become increasingly inaccurate.
Ongoing frequency deviations occur in off-grid systems with PV inverters and generators, for example.
If the automatic frequency synchronisation is activated, the off-grid inverter regulates the frequency
deviations during the day.
The timepiece in the off-grid inverter is quartz-controlled and is not dependent on the power
frequency.
1. Switch to expert mode (see Section 7.6).
2. To deactivate automatic frequency synchronisation, select the 250.11 AfraEna parameter and
set it to Disable.
3. To activate automatic frequency synchronisation, select the 250.11 AfraEna parameter and
set it to Enable.
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