SI4548-US-10 Manual

12 Additional Functions SMA America, LLC
104 SI4548_6048-US-TB_en-13 Technical description
12.2 Sleep Mode
Using the "250.10 SleepEna" parameter set to "Enable" allows the sleep mode to be activated in
single-phase grids, which the master uses to switch off the slaves when the power value allows this.
12.3 Time-Controlled Operation
The Sunny Island can be operated in a time-controlled manner using a timer function
(like a clock timer), supplying power at a planned point in time.
To do this, this function must be activated by using the "510.02 InvTmOpEna" parameter. Using the
"510.03 InvTmOpStrDt" parameter, you can specify the starting date, and using the
"510.04 InvTmStrTm", you specify the starting time. With the parameter "510.05 InvTmOpRnDur",
you set the running time and with the parameter "510.06 InvTmOpCyc", you determine whether this
function will be carried out once, every day or weekly, at or from the specified start time (date and
time).
12.4 Overload and Short-Circuit Behavior
The Sunny Island can be temporarily operated under overload conditions and is able to supply
short-circuit current.
In the event of overload the Sunny Island 4548-US supplies a power of 5,300 W for 30 minutes at
77°F (25°C) and the Sunny Island 6048-US a power of 7,000 W. Both Sunny Island inverters can
deliver a power of 7,200 W for five minutes at 77°F (25°C). The available power can even reach
8,400 W for one minute at 77°F (25°C).
In the event of a short-circuit the Sunny Island provides a maximum current of 180 A (for 60 ms).
This is sufficient to trip commercial 20 A circuit breakers.
12.5 Mixed Operation with Sunny Island inverters of
Different Power
The Sunny Island inverters 4548-US, 6048-US and 5048U can be operated in an off-grid system
together.
Each Sunny Island makes its contribution to cover the current power requirements of the load. This
contribution is made up of the ratio of the nominal power of each Sunny Island to the overall power
of all Sunny Island inverters.
If an SI 5048U is installed in an off-grid system configure the SI 5048U as slave or equip with the
latest firmware (see www.SMA-America.com).
Double-Split-Phase System
In a double split-phase system, each line conductor must be fitted with Sunny Island inverters of the
same type (e.g. two Sunny Island 6048-US).
Sleep mode
The "Sleep Mode" works exclusively in stand-alone grid operation! The values for connection
and disconnection of the Sunny Island are already set at the factory (optimized in terms of
efficiency).