7 Commissioning
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
88
• Set the second stage of load shedding.
Set the first stage of load shedding
1. Select
Device > Load shedding 1 > Additional time range
.
2. Set the parameter
Lmt value battery state of charge for start load shedding 1
to the lower SOC threshold.
3. Set the parameter
Lmt value battery state of charge for stop load shedding 1
to the upper SOC threshold.
4. Set the parameter
Time load shedding 1
and the parameter
Start time additional time range load
shedding 1
each to the same value, e.g. to
00:00:00
. This will switch the time-dependent load shedding off.
5. Ensure that the parameter of the multifunction relay has been set to
1-stage load shedding or 1st stage with
2-stage load shedding
(see Section 7.10.2, page 102).
Setting the second stage of load shedding
1. Select
Device > Load shedding 2
.
2. Set the parameter
Lmt value battery state of charge for start load shedding 2
to the lower SOC threshold.
3. Set the parameter
Limit battery state of charge for stop load shedding 2 in add time range
to the upper
SOC threshold.
4. Select
Device > Load shedding 2 > Additional time range
.
5. Set the parameter
Time load shedding 2
and the parameter
Start time additional time range load
shedding 2
each to the same value, e.g. to
00:00:00
. This will switch the time-dependent load shedding off.
6. Ensure that the parameter of the multifunction relay has been set to
1st stage with 2-stage load shedding
7.7.4
Setting Time-Dependent One-Level Load Shedding
The basic procedure for changing operating parameters is explained in another section (see Section 8.6, page 113).
The time-dependent load shedding divides the day into 2 intervals (see Section 8.12.2, page 117). You set the SOC
thresholds that apply for each interval. For example, you can set that no loads are to be disconnected from the utility
grid during the night where possible.
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 utility 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 utility grid.
From 10:00 p.m. to 6:00 a.m., the load-shedding contactor is not to disconnect the loads from
the utility grid where possible.
