Using this manual
Batteries_Rail_Power_Manual_en02.docx
8
1.3.
Notation of nominal data
Nominal battery data is used in accordance with the following notation in this operation and
maintenance manual:
Notation
Description
Declaration
U
n
Nominal voltage
Defined for each cell-Chemistry; corresponding
to the average voltage during discharge
U
E
Final discharge voltage
Voltage at which the battery is defined as
discharged. This also depends on the discharge
current.
U
0
Open circuit Voltage
Voltage at the battery terminals in idle state (no
charge or discharge)
C
n
Nominal capacity
Electrical charge of the battery in Ah during
discharge at rated current down to the final
discharge voltage at rated temperature.
I
n
=I
5
Nominal Current I
n
=I
5
Fixed charge/discharge current (serves as
reference value)
C-Rate
C-Rate
Battery discharge current based on the rated
capacity
Example: Discharge with 0.2 C means a
discharge with 20 A for a 100 Ah battery
I
XX
Discharge Current
Named as I
xx
based on rated capacity
Example: I
5
for a 100 Ah battery = 100 Ah/5 h
=20 A
T
n
Nominal Temperature T
n
Reference temperature for capacity
D
Tightening torque terminal
screws D
M8: 20 Nm ± 1 Nm
1.4.
Abbreviations and glossary of terms
The following table describes abbreviations and terms that are used in this operating and
installation manual:
Abbreviation/term
Explanation
Float charge
Denotes the charging of the battery to compensate for its self-
discharge with the aim to keep the battery in a fully charged
condition.
Boost charge
Denotes the charging of the battery with elevated voltage and a
defined current to get the full state of charge in the best possible
charging time.
CAS number
The CAS number (also called CAS registration number and CAS
registry number, CAS = Chemical Abstracts Service) is an
international identification standard for chemical substances.
Electrolyte
HOPPECKE rail.power blocks are valve-regulated lead-acid
batteries. When handled correctly, rail.power batteries are safe and
contact with the electrolyte is not possible.