SMA Solar Technology AG Glossary
Technical Description SI2012_2224-TEN082311 205
Derating
A controlled reduction in performance, usually dependent on component temperatures. Compared
with the (also common) practice of completely shutting down the device, the effect on the external
grid is smaller with derating.
DSP
Abbreviation for Digital Signal Processor. A DSP is a microprocessor chip especially developed for
digital signal processing and control.
Electrolyte
Allows the conduction of ions within a battery.
In a lead acid battery, the electrolyte is diluted sulfuric acid and is also a reactant in the
electrochemical reaction.
Nickel/cadmium batteries use an alkaline electrolyte (potassium hydroxide).
EPROM
See Flash EEPROM.
Equalize Charge
Equalization charge: allows different series-connected battery cells to be charged to a unified
charge level of 95 – 100 %. Without regular equalization charging, the charge states of the
individual cells slowly drift apart, which can lead to premature battery bank failure.
Equalization Charge
See Equalize Charge.
Extension Cluster
see sub-cluster
Firmware
Firmware is software which is embedded in a chip in various electronic devices, such as hard disk
recorders, DVD burners and players, newer television sets, household appliances and computers -
in contrast to software, which is stored on hard drives, CD-ROMs or other media. These days,
firmware is usually stored in a flash memory or an EEPROM.
FLA
Flooded lead acid battery: a lead acid battery with liquid electrolyte, also often described as a
closed lead acid battery.
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