Glossary
SMA America, LLC
224
SI5048U-TUS121440
Technical Description
PLC
Abbreviation for Power Line Communication: Describes the process of data transfer over the grid
supply cables. The PLC power module is used to amplify the signal and is connected in Multi-String
and Sunny Mini Central inverters. Powerline communication is not suitable for Sunny Island inverters.
Protected loads panel
See ”Stand-alone grid system”.
PV
Photovoltaics (PV) is the conversion of solar irradiation into electrical energy using special
semiconductors called solar cells.
PV array
See PV generator.
PV generator
Technical device for the conversion of light energy into electrical energy. All the series and parallel
mounted and electrically connected solar modules in a PV system are known as the PV generator.
PV module
See Solar module.
PV system
Describes a solar power system for generating electrical power. Describes the complete collection of
components needed for the acquisition and utilization of solar energy. As well as the PV generator,
this includes the Sunny Boy or Sunny Mini Central, for example, in the case of grid-coupled systems.
Self discharge
Loss of battery charge 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 four 12 V batteries with a capacity of 100 Ah each are connected in series, the total
voltage is 4 x 12 V = 48 V, while the total capacity remains at 100 Ah.
SOC
State of Charge: The state of charge of the batteries, see State of Charge. If (e.g) 25 Ah is taken from
a 100-Ah battery, the state of charge (SOC) is then 75 %.
Solar energy
”Sun energy”, this means energy from sunlight or other solar irradiation (heat and/or UV radiation).
