SMA SI 3.0-11 Installation - Manual (Page 79)

SMA Solar Technology AG 8 Commissioning
Installation Manual SI30M-44M-60H-80H-IA-en-30 79
8.3.3 Setting Two-Level Load Shedding
Two multifunction relays control two load-shedding contactors depending on the state of charge of the battery.
Significance of the SOC thresholds:
Two lower and two upper SOC thresholds each are available for controlling the load-shedding contactors.
The load-shedding contactors disconnect the loads from the utility grid if the states of charge are as follows:
• When the state of charge of the battery reaches the first lower SOC threshold, the multifunction relay opens the
connected load-shedding contactor for the first level of load shedding. The load-shedding contactor disconnects
those loads from the utility grid that are to be disconnected for the first level.
• When the state of charge of the battery reaches the second lower SOC threshold, the multifunction relay opens the
connected load-shedding contactor for the second level of load shedding. The load-shedding contactor disconnects
the remaining loads from the utility grid.
• When the state of charge of the battery reaches the second upper SOC threshold during recharging, the
multifunction relay closes the connected load-shedding contactor for the second level of load shedding.
The load-shedding contactor connects those loads, which were disconnected for the second level, to the utility grid.
• When the state of charge of the battery reaches the first upper SOC threshold during recharging, the multifunction
relay closes the connected load-shedding contactor for the first level of load shedding. The load-shedding contactor
connects those loads, which were disconnected for the first level, to the utility grid. All loads are connected to the
utility grid.
Requirement:
☐ In a cluster, the Sunny Remote Control must be connected to the master.
Procedure:
1. Switch to installer mode on the Sunny Remote Control (see the Sunny Island inverter operating manual).
2. Setting the first level of load shedding:
• Select the parameter 242.01 Lod1SocTm1Str and set it to the lower SOC threshold.
• Select the parameter 242.02 Lod1SocTm1Stp and set it to the upper SOC threshold.
• Set the parameters 242.05 Lod1Tm1Str and 242.06 Lod1Tm2Str to the same value, e.g. both to 000000.
This switches off time-dependent load shedding.
• Ensure that the parameter of the multifunction relay is set to AutoLod1Soc (see Section 8.1.5 "Setting the
Functions of the Multifunction Relays", page 66).
3. Setting the second level of load shedding:
• Select the parameter 242.07 Lod2SocTm1Str and set it to the lower SOC threshold.
• Select the parameter 242.08 Lod2SocTm1Stp and set it to the upper SOC threshold.
• Set the parameters 242.11 Lod2Tm1Str and 242.12 Lod2Tm2Str to the same value, e.g. to 000000.
This switches off time-dependent load shedding.
• Ensure that the parameter of the multifunction relay is set to AutoLod2Soc (see Section 8.1.5 "Setting the
Functions of the Multifunction Relays", page 66).