SMA SI 4548-US - Manual (Page 233)

SMA America, LLC 23 Glossary
Operating Manual SI4548-6048-US-BE-en-20 233
Battery
A battery is an electrochemical energy storage that can release previously stored chemical energy as
electrical energy. A distinction is made between non-rechargeable batteries (often used in
end-customer markets) and rechargeable batteries (batteries). In stand-alone grid systems, lead-acid
batteries are almost always used and, very rarely, nickel-cadmium batteries are used as secondary
rechargeable batteries.
Battery Charge Mode
Operating mode of the battery inverter in which the inverter takes energy from the AC grid to recharge
the battery in a controlled way. In this operating mode, 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 optimum battery storage system charging and reliable
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 converter that can regulate voltage and frequency in a stand-alone grid as well as
correctly charge the batteries.
Battery Storage System
The combination of serial and possibly also parallel connection of several identical batteries.
Typical battery storage systems are 12 V, 24 V, 48 V and 60 V.
CEC
Abbreviation for "California Energy Commission"
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 current IN and the discharge
time t
N
, which passes between commencement of discharging the fully charged battery and when the
final cut-off voltage VS is reached. For stationary batteries, the C10 capacity is usually specified, i. e.
a battery with C10 = 200 Ah can be discharged for 10 hours at a nominal current of 0.1 × C10 =
I10 = 20 A.