SMA Sunny Island 5048 Installation Instructions Manual page 163

SMA
Technologie AG Glossary
Describes the current amount of charge that can be drawn from the battery, in percent
of the nominal capacity (100 % = battery full, 0 % = battery empty).
Charge mode
See Battery charging mode
C-rate
The nominal capacity specification is always provided with the discharge time on which
the capacity is based. The nominal capacity is the product of the constant charging cur-
rent IN and the discharge time tN, that passes between commencement of discharging
the fully charged battery until the final discharge voltage VS is reached. In permanently
on-site batteries, the C capacity is usually specified. i.e. a battery with C = 200 Ah
10 10
can be discharged for 10 hours at a nominal current of 0.1 × C = I = 20 A.
10 10
DC
Abbreviation for "Direct Current"
Derating
A controlled reduction in performance, usually dependent on component temperatures.
Derating is used instead of performing a complete shutdown of the system.
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 lead acid batteries, the electrolyte is
diluted sulfuric acid and is also a reactant in the electrochemical reaction. Nickel/Cad-
mium batteries use an alkaline electrolyte (potassium hydroxide).
EPROM
See Flash EEPROM
Equalize charge
Equalize charge: Allows multiple series-connected battery cells to be charged to a uni-
fied charge level of 95 – 100 %. Without regular equalization charging, the charge
states of the various cells slowly drift apart, which can lead to premature battery bank
failure.
Firmware
Firmware is software that is stored in a chip in various electronic devices, such as Sunny
Island, hard disk recorders, DVD burners and players, newer television sets, household
appliances and computers - in contrast to software that is stored on a hard drive, CD-
ROM or other media. These days, firmware is usually stored in Flash memory or an EE-
PROM.
Technical Description SI5048-11:EE4206 Seite 163