SMA SI 3324 - Manual (Page 68)

Glossary SMA Technologie AG
Page 154 SI3324/4248-14:FE2406 User Manual
Battery charge mode
An operating mode of a battery inverter in which the inverter takes energy from the
AC grid to charge the batteries in a controlled fashion. In this mode of operation, the
battery inverter is responsible for correctly charging the batteries and acts like an
independent battery charger.
Battery inverter
See Battery power converter
Battery management
The battery management is responsible for the optimum charging of the battery bank
and for protection against deep discharge. This is the only way of ensuring that the
battery service life reflects the manufacturer's specifications.
Battery power converter
A bidirectional power converter that can regulate voltage and frequency in a stand-
alone grid as well as correctly charging the batteries.
Battery system
Serial and possibly also parallel connection of several identical batteries. Battery
banks of 12 V, 24 V, 48 V and 60 V are typical.
Boost charge
Rapid charging: Allows the batteries to be charged to a level of approx. 85 – 90 %
in the shortest time and the most efficient manner.
Bulk phase
I-Phase: The charging phase in which charging can be done using the maximum
allowable charging current.
Capacity
Describes the storage capability of a cell or battery, specified in Ah (ampere hours).
The capacity of a battery is heavily dependent on the charging cycle, the amount of
current drawn and the temperature.
Central inverter
An inverter concept, in which all PV modules are connected to each other (in series
and/or parallel) and which uses a single inverter for feeding energy into the mains
supply grid. The low cost of the inverter is usually offset by the much higher
installation efforts required and possible yield losses due to variations in shadowing
of different solar modules.
Charge level
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).