Energy Management; Setting Load Shedding In A Multicluster System - SMA SUNNY ISLAND 3.0M Installation Manual

8 Commissioning
• Select the parameter Temperature limit for multifunction relay with battery room fan /
221.07 BatFanTmpStr and set it to the battery temperature at which the fan is to be switched on.
2. Ensure that the multifunction relay used for control is set to BatFan or MccBatFan (see Section 8.1.5 "Setting the
Functions of the Multifunction Relays", page 71).
3. Ensure that the battery room is sufficiently ventilated in the case of malfunctions – for example, on failure of the
multifunction relay.

8.3 Energy Management

8.3.1

Setting Load Shedding in a Multicluster System

The load contactor in the Multicluster Box is a load-shedding contactor and is controlled depending on the
state of charge of the batteries.
Significance of the SOC thresholds:
When the state of charge of a battery reaches the lower SOC threshold, the load contactor is opened. The state of charge
of the battery of the main cluster and the states of charge of the batteries of the extension clusters are evaluated. The load
contactor disconnects the loads from the stand-alone grid. When the state of charge of all batteries reaches the upper
SOC threshold during recharging, the load contactor closes. 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:
☐ The communication product or Sunny Remote Control must be connected to the master of the main cluster.
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 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).
84 SI30M-44M-60H-80H-IA-en-32
SMA Solar Technology AG
Installation manual