SMA Sunny Island 5048 - Page 93

SMA Solar Technology AG Additional Functions
Technical Description SI5048-TB-TEN110340 93
The figure shows an example of the settings if the load shedding function at night is to be avoided as
much as possible. From 6:00 a.m. to 10:00 p.m., the load shedding is activated for a state of charge
(SOC) of 40 %, during nighttime (from 10:00 p.m. to 6:00 a.m.). By contrast, the state of charge of
the battery is allowed to go down to 30 % before the load-shedding contactor is activated.
The load shedding function can be assigned a total of two times. In the parameters mentioned above,
the "Lod1" part represents the first assigned function and the "Lod2" part represents a second,
identical function. These two battery state-dependant load-shedding functions allow a step by step
load shedding where different load groups with different SOC values can be defined with different
priorities.
Define the time intervals t1 and t2:
• Starting time t1: with the "242.05 Lod1Tm1Str" parameter, set the start time for t1
(and with it the end of t2).
• Starting time t2: with the "242.06 Lod1Tm2Str" parameter, set the start time for t2
(and with it the end of t1).
• If the time intervals t1 (Lod1Tm1Str) and t2 (Lod1Tm2Str) are consistent with one another,
only t1 will be activated.
Set the battery state of charge at which the time interval t1 or t2 will start/stop:
• The battery state of charge during the t1 interval, the recognition of which will lead to the
load-shedding function being started: Parameter "242.01 Lod1SocTm1Str"
• The battery state of charge during the t1 interval, the recognition of which will lead to the
load-shedding function being stopped: Parameter "242.02 Lod1SocTm1Stp"
• The battery state of charge during the t2 interval, the recognition of which will lead to the
load-shedding function being started: Parameter "242.03 Lod1SocTm2Str"
• The battery state of charge during the t2 interval, the recognition of which will lead to the
load-shedding function being stopped: Parameter "242.04 Lod1SocTm2Stp"
Lod1SocTm2 Stp Lod1SocTm2 Stp
0h 6h
Lod1Tm1Str Lod1Tm2Str
Lod1SocTm1 Stp
22h 24h
Lod1SocTm2 Str Lod1SocTm2 Str
Lod1SocTm1 Str
t1
t2
t2
30
40
80
Soc [%]