SMA Sunny Island 5048 Installation Instructions Manual page 164

SMA
Glossary Technologie AG
FLA
Flooded Lead Acid battery: A lead acid battery with liquid electrolyte, also often de-
scribed as a sealed lead acid battery.
Flash EEPROM
The abbreviation EEPROM stands for Electrically Erasable Programmable Read-Only
Memory. Flash memory is a digital storage chip, the exact designation is Flash EE-
PROM. In contrast to "normal" EEPROM storage, individual bytes (the smallest addres-
sable storage units) cannot be deleted.
EEPROM is a non-volatile, electronic storage component that is used in the Sunny Is-
land, the computer industry (among others) and usually in Embedded Systems.
Flash EEPROMs are used where information must be permanently stored in the smallest
amount of space, e.g. for storing the firmware.
Float charge
Maintenance charge: Allows the batteries to be slowly charged to a charge level of
100 % without the negative effects of overcharging. Complete charging to 100 % using
float charge takes several days. For this reason, float charging is more important for
grid backup systems and less important for stand-alone grids.
Full charge
Recharging of the batteries to a level of approx. 95 % on a regular basis (at least once
a month). This efficiently avoids premature aging of the batteries caused by inadequate
charging.
Gel battery
A type of battery in which the electrolyte (a mixture of water and sulfuric acid) is bound
into a gel. This is a type of sealed lead acid battery. A gas mixture (hydrogen and oxy-
gen) is always generated when lead acid batteries are charged, and in normal opera-
tion this internally recombines to form water. This removes the need for regularly refilling
the battery cells with water, which is why these batteries are often described as "low
maintenance" or even "maintenance free" (see also AGM batteries). Gel batteries are
available from many different manufacturers for a wide range of applications. There
are Gel batteries for high-current applications but also for cycle operation with very
high cycle resistance.
Grid-coupled system
PV system that is connected to the power supply grid of an external energy supplier.
Independent disconnection device
The "Independent disconnection device between a grid parallel power generating sys-
tem and the public low voltage grid" (DIN VDE 0126-1-1) is an equivalent replacement
for a normal public disconnection device with isolation function that is accessible to the
distribution grid operator at any time. This is a mandatory safety device that prevents
Seite 164 SI5048-11:EE4206 Technical Description