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Installation, commissioning and operating instructions for valve-regulated stationary lead-acid batteries
7140203153 V1.4 (09.2018)
Installation, commissioning and operating instructions for valve-regulated stationary lead-acid batteries
7140203153 V1.4 (09.2018)
Battery type
Float charge voltage
OPzV
2.25 ± 1% V/cell
power.bloc OPzV
2.25 ± 1% V/cell
net.power 12 V 100 und 150 Ah
2.25 ± 1% V/cell
net.power 12 V 92 und 170 Ah
2.27 ± 1% V/cell
power.com XC
2.27 ± 1% V/cell
grid
| power
VR M
(power.com SB)
2.25 ± 1% V/cell
power.com HC
2.25 ± 1% V/cell
sun
| power
VR L
(OPzV solar.power/OPzV bloc solar.power)
2.25 ± 1% V/cell
sun
| power
VR M
(solar.bloc)
2.25 ± 1% V/cell
grid
| power
VR X
/grid
| power
VR X FT
2.28 ± 1% V/cell
Tab. 6–2: Float charge voltage adjustment in standby parallel operaion
DC power supply
Elctrical Load
Battery
Charger
6.2.1 Standby parallel operation
Fig. 6–2: Standby parallel operation
The following is characteristic for this operating mode:
– Consumers, direct current source and battery are connected in parallel.
– The charge voltage is the operating voltage of the battery and the system voltage at the same time.
– The direct current source (charging rectifier) is capable of supplying the maximum load current and the battery
charge current at any time.
– The battery only supplies current when the direct current source fails.
– The charge voltage should be set at
(see Tab. 6–2)
x number of cells in series (measured at the battery’s
terminals).
– To reduce the recharging time, a charging stage can be applied in which the charge voltage is max 2,40 V x
number of cells (standby parallel operation with recharging stage).
– Automatic changeover to the charge voltage of
(see Tab. 6-2)
x number of cells in series occurs after charging.
DC power supply
Electrical Load
Battery
6.2.2 Floating operation
The following is characteristic for this operating mode:
– Consumers, direct current source and battery are connected in parallel.
– The charge voltage is the operating voltage of the battery and the system voltage at the same time.
– The direct current source is not able to supply the maximum load current at all times. The load current inter-
mittently exceeds the nominal current of the direct current source. During this period the battery supplies
power.
– The battery is not fully charged at all times.
– Therefore, depending on the number of discharges, the charge voltage must be set to approx. (2.27 to 2.30
V) x the number of cells connected in series.
6.2.3 Switch mode operation (charge/discharge operation)
Fig. 6–3: Switch mode operation
The following is characteristic for this operating mode:
– When charging, the battery is separated from the consumer.
– The max. charge voltage of the battery is 2.4 V/cell.
– The charging process must be monitored.
– At 2.4 V/cell, if the charge current has dropped to 1.5 A per 100 Ah nominal capacity, you must switch to
float charging as described in
Chap. 6.2.4.
– The battery may be connected to the consumer if required.
6.2.4 Float charging
Float charging is used to keep the battery or batteries in a fully charged state and corresponds to a large extent
to the charge type, mentioned in
chapter 6.2.1.
Use a charger that complies with the specifications described in DIN 41773 (IU characteristic curve).
Set the voltage so that average voltage is 2.25 V ±1 % (2.27 V ±1 % for net.power 12 V 92/170
Ah and power.com XC and 2.28 V ±1 % for
grid
| power
VR X
).
Example: Nominal battery voltage: 60 V, float charge voltage of charging device is 30 x float charge voltage per
cell. E.g. 30 x cells OPzV result in 30 x 2.25 V = 67.5 V +/-1% (=max. 68.18 V/min. 66.83 V).
