SMA Sunny Island 5048 Installation Instructions Manual page 48

Electrical Connection
- C: Contact (operating contact)
- NO: Normally opened (open when in standby)
4. Insert the
corresponding socket.
We recommend connecting the load shedding and
generator request functions to the master, since, if a failure occurs, the slave may be
waiting for a confirmation, but the master continues to operate and the device can at
least operate in a limited capacity.
Information on the switching capacities of the relays is provided in section 20
"Technical Data" (Page 155).
Load Shedding
The Sunny Island 5048 can automatically switch off loads to protect the battery from
deep discharge. To do so, an external (AC or DC) power contactor must be installed
between the Sunny Island 5048 and the loads (see also section 2.6 "Accessories
(Optional)" (Page 19)).
Installation of the load shedding system is strongly recommended in
systems with extensive AC-side coupling of solar power or wind power.
This is the only way to achieve safe operation of the system, even in cases
of low energy generation or very high consumption.
Only switch the loads off, never switch the generators off (e.g. Sunny
Boys)!
Generator Start
The Sunny Island 5048 can control generators. It supports generators that can be
started and stopped by a single contact and generators that require more than one
contact (in combination with the optionally available generator manager (GenMan)).
The two relays, which are integrated in the Sunny Island 5048 and are freely
programmed, assume both tasks (depending on the programming in menu #261,
parameter Rly1Op and Rly2Op), see also section 15 "Relay" (Page 115).
The AutoGn function is pre-configured for Relay1 and the AutoLodSoc function is
pre-configured for Relay2.
If you would like to use both functions, connect them accordingly here (properly).
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SMA
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Technical Description