Setting One-Level Load Shedding; Setting Two-Level Load Shedding - SMA SUNNY ISLAND 3.0M Installation Manual

SMA Solar Technology AG
8.3.2

Setting One-Level Load Shedding

One multifunction relay controls the load-shedding contactor depending on the state of charge of the battery.
Significance of the SOC thresholds:
When the state of charge of the battery reaches the lower SOC threshold, the multifunction relay opens the connected
load-shedding contactor. The load-shedding contactor disconnects the loads from the stand-alone grid. When the state
of charge of the battery reaches the upper SOC threshold during recharging, the multifunction relay closes the connected
load-shedding contactor. The load-shedding contactor connects the loads to the stand-alone grid.
You can change the battery protection mode on the communication product or on the Sunny Remote Control.
Requirement:
☐ In a cluster, the communication product or Sunny Remote Control must be connected to the master.
Procedure:
1. Log in to the communication product as Installer (see the user manual of the communication product) or switch to
expert mode on the Sunny Remote Control (see the Sunny Island operating manual).
2. Select the parameter Battery state of charge limit for load shedding 1 start / 242.01 Lod1SocTm1Str and
set it to the lower SOC threshold.
3. Select the parameter Battery state of charge limit for load shedding 1 stop / 242.02 Lod1SocTm1Stp and
set it to the upper SOC threshold. The upper SOC threshold must be at least 10 percentage points above the lower
SOC threshold.
4. Set the parameter Time load shedding 1 / 242.05 Lod1Tm1Str and the parameter Start time for the
additional time period of load shedding 1 / 242.06 Lod1Tm2Str each to the same value, e.g., to 00:00:00.
This will switch the time-dependent load shedding off.
5. If the loads are only to be reconnected when the set SOC threshold is reached, 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 71).
6. If the loads are to be supplied by an external energy source during recharging of the battery, ensure the following:
• Ensure that the parameter of the multifunction relay is set to AutoLodExt (see Section 8.1.5 "Setting the Functions
of the Multifunction Relays", page 71).
• Ensure that the external energy source can supply the loads with sufficient power.
7. If the off-grid system is a multicluster system, ensure that the parameter of the multifunction relay is set to
MccAutoLod (see Section 8.1.5 "Setting the Functions of the Multifunction Relays", page 71).
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 to the utility grid that were disconnected for the second level .
Installation manual SI30M-44M-60H-80H-IA-en-32
8 Commissioning
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