SMA SI 4548-US - Manual (Page 103)

SMA America, LLC 12 Additional Functions
Operating Manual SI4548-6048-US-BE-en-20 103
The figure shows an example of the settings if the step-by-step load shedding function at night is to be
avoided as much as possible. From 6 a.m. to 10 p.m. the load shedding is activated for a state of
charge (SOC) of 40%, at nighttime (from 10 p.m. to 6 a.m.), however, 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. Thus, in the above listed parameters,
the part "Lod1" (see parameters "242.01 Lod1SocTm1Str" to "242.06 Lod1Tm2Str") represents the
first assigned function. Another part "Lod2" (see parameters "242.07 Lod2SocTm1Str" to
"242.12 Lod2Tm2Str") represents a second, identical function. These two battery state-dependent
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 parameter "242.05 Lod1Tm1Str", set the start time for t1 (and with it the
end of t2).
• Starting time t2: with parameter "242.06 Lod1Tm2Str", 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"