7 Commissioning SMA Solar Technology AG
92 SI80H-60H-OffGrid-IA-en-11 Installation Manual
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 multi-function relay is set to AutoLodExt
(see Section 7.10.1).
• 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 multi-function relay
is set to MccAutoLod (see Section 7.10.1).
7.10.4 Setting 2-Level Load Shedding
Two multi-function relays control two load-shedding contactors depending on the state of charge of
the battery.
Significance of the SOC limiting values:
Two lower and two upper SOC limiting values each are available for controlling the load-shedding
contactors. The load-shedding contactors disconnect the loads if the states of charge are as follows:
• When the state of charge of the battery reaches the first lower SOC limiting value, the multi-
function relay opens the connected load-shedding contactor for the first level of load shedding.
The load-shedding contactor disconnects those loads from the stand-alone grid that are to be
disconnected for the first level.
• When the state of charge of the battery reaches the second lower SOC limiting value, the
multi-function relay opens the connected load-shedding contactor for the second level of load
shedding. The load-shedding contactor disconnects the remaining loads from the stand-alone
grid.
• When the state of charge of the battery reaches the second upper SOC limiting value during
recharging, the multi-function relay closes the connected load-shedding contactor for the second
level of load shedding. The load-shedding contactor connects those loads to the stand-alone
grid that were disconnected for the second level.
• When the state of charge of the battery reaches the first upper SOC limiting value during
recharging, the multi-function relay closes the connected load-shedding contactor for the first
level of load shedding. The load-shedding contactor connects those loads to the stand-alone
grid that were disconnected for the first level. All loads are now reconnected to the stand-alone
grid.
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