SMA Sunny Island 2012 Technical Description page 209

SMA Solar Technology AG
Glossary
Piggy-Back (Board)
A printed circuit board which is plugged into another board to increase performance or expand
capabilities. A piggy-back board can also replace an individual chip. In this case, the chip is
removed and the board is plugged into the empty socket.
PLC
Abbreviation for "power line communication": describes the process of data transfer over the grid
connection. The PLC power module is used to amplify the signal and is connected in Multi-String
and Sunny Mini Central inverters.
PV
Photovoltaics (PV) is the conversion of solar irradiation into electrical energy using special
semiconductors, so-called solar cells.
PV-generator
Technical device for the conversion of light energy into electrical energy. This term encompasses all
the electrically connected (in series and in parallel) solar modules in a PV system.
PV-module
See "Solar module".
PV system
Describes a solar power system for generating electrical power. This includes the complete
collection of components required for the acquisition and utilization of solar energy. As well as the
PV generator, this also includes the Sunny Boy or Sunny Mini Central inverter, for example, in the
case of grid-connected systems.
Rapid Charge
see Boost Charge
Self Discharge
Capacity loss of a battery cell while it is stored or not used. A higher ambient temperature has a
strong influence on self discharge.
Series Connection
In this case the positive pole of each battery is connected to the negative pole of the next battery.
There is only one circuit where current can flow. Series connection increases the voltage of the entire
battery bank. If two 24 V batteries with a capacity of 100 Ah each are connected in series, the total
voltage is 24 V + 24 V = 48 V, while the total capacity remains at 100 Ah.
Slave
A configuration setting which assigns a subordinate role in a cluster to a Sunny Island or Sunny
Backup inverter. Thus, this device is relieved of control tasks and monitoring tasks, which must (or
may) only be performed by one device in a cluster (−> master). Slave devices accept the
configuration settings, present firmware, and start/stop commands from the master, and report these
events, as well as warnings and error messages.
Technical Description SI2012_2224-TEN082311 209