SMA SI 3324 Installation - Manual (Page 80)

Commissioning SMA Technologie AG
Page 80 SI3324/4248-14:SE2406 Installation Guide
8.6 Automatic Load Shedding Setting
The Sunny Island 3324/4248 can automatically switch off loads if the battery
voltage is getting too low. The relay responsible for this is controlled by the "40-6
LoadShedding" parameter, which is set to "OFF" at the factory.
The load shedding relay has a normally closed (NC) contact. If the "40-6
LoadShedding" parameter is set to "Auto" then the contact opens when the battery
voltage has decreased to a charge level of "BatState = Low" or "BatState = Critical"
(see section 11.3 "Deep Discharge Protection/Battery State" (Page 105)), or the
Sunny Island 3324/4248 switches itself off or is stopped. The relay contact can also
be closed when the Sunny Island 3324/4248 is stopped by setting the "40-6
LoadShedding" parameter to "ON" (see section 17.1 "Menu Structure" (Page 130)).
If the "40-6 LoadShedding" parameter is set to "OFF" then the automatic load
shedding is switched off and the relay is opened.
8.7 Operation with Sunny Boy Inverters
Set the "40-8 SunnyBoys" parameter to "Yes". (For further settings relating to
operation with PV inverters, see section 13 "Connecting Sunny Boy Inverters"
(Page 117)).
8.8 Autostart Function
The autostart function allows the Sunny Island 3324/4248 to start automatically. If
AutoStart is set to "Off" (default value) then the inverter must always be manually
started.
Set the "40-2 Autostart" parameter to "On". (For further settings relating to the
autostart function, see section 13 "Connecting Sunny Boy Inverters" (Page 117)).
Parameter Setting Relay contact
40-6 ON
always closed when the Sunny Island
3324/4248 is running
40-6 OFF always open
40-6 AUTO automatic (see above text)
Load shedding is an important feature for protecting batteries from quick
aging caused by deep discharge. This is only activated when, over a longer
period of time, more energy is consumed than is generated, or when the
generator does not start (lack of fuel, generator fault).