User manual
2.6 Charging currents
The charging currents are not limited during
standby parallel operation or buffer operation
without recharging stage. The charging current
should range between the values given in table 5
(guide values).
In cycling operation, the maximum current val-
ues as shown in table 5 must not be exceeded.
2.7 Temperature
The recommended operation temperature range
for lead acid batteries is 10 °C to 30 °C (best:
nominal temperature ± 5K). Higher temperatures
will seriously reduce service life. Lower tempera-
tures reduce the available capacity.
The absolute maximum temperature is 55 °C
and should not exceed 45 °C in service.
All technical data refer to a nominal temperature
of 20 °C and 25 °C respectively.
2.8 Temperature related charge voltage
The temperature related adjustment has to be
carried out acc. to the following figures 1 to 4.
An adjustment of the charge voltage must not be
applied within a specified temperature range as
shown in table 6.
The battery only supplies current when the
battery charger fails. The charging voltage
should be set acc. to table 2 measured at the
end terminals of the battery.
To reduce the charging time a boost charging
stage can be applied in which the charging volt-
age acc. to table 3 can be adjusted (stand-
by-parallel operation with boost recharging
stage).
Automatic change over to charging voltage acc.
to table 2 should be applied.
b.) Buffer operation
With buffer operation the battery charger is not
able to supply the maximum load current at all
times. The load current intermittently exceeds
the nominal current of the battery charger. Dur-
ing this period the battery supplies power. This
results in the battery not fully charged at all
times. Therefore, depending on the load the
charge voltage must be set acc. to table 4. This
has to be carried out in accordance with the
manufacturers instructions.
Float voltage Nominal
[Vpc] temp. [°C]
Marathon L/XL 2.27 20
Marathon M/M-FT 2.27 25
Sprinter P/XP/FT 2.27 25
Sprinter S 2.27 25
Powerfit S300 2.27 20
A400/FT 2.27 20
PowerCycle 2.27 20
A500 2.30 20
A600 2.27 20
A700 2.27 20
Table 2: Float voltage
Voltage on boost Nominal
charge stage temp.
[Vpc] [°C]
Marathon L/XL 2.35-2.40 20
Marathon M/M-FT 2.35-2.40 25
Sprinter P/XP/FT 2.35-2.40 25
Sprinter S 2.35-2.40 25
Powerfit S300 2.35-2.40 20
A400/FT 2.37-2.40 20
PowerCycle 2.37-2.40 20
A500 2.40-2.45 20
A600 2.35-2.40 20
A700 2.35-2.40 20
Table 3: Voltage on boost charging stage
Charging current
Marathon L/XL 10 to 35 A per 100Ah
Marathon M/M-FT 10 to 35 A per 100Ah
Sprinter P/XP/FT 10 to 35 A per 100Ah
Sprinter S 10 to 35 A per 100Ah
Powerfit S 300 10 to 35 A per 100Ah
A400/FT 10 to 35 A per 100Ah
PowerCycle 10 to 35 A per 100Ah
A500 10 to 35 A per 100Ah
A600 10 to 35 A per 100Ah
A700 10 to 35 A per 100Ah
Table 5: Charging currents
No adjustment within
temperature range
A400/FT 15 °C to 35 °C
PowerCycle 15 °C to 35 °C
A500 15 °C to 35 °C
A600 15 °C to 35 °C
A700 15 °C to 35 °C
Table 6: Temperature range without
voltage adjustment
Voltage in Nominal
buffer operation temp.
[Vpc] [°C]
Marathon L/XL 2.29-2.32 20
Marathon M/M-FT 2.29-2.32 25
Sprinter P/XP/FT 2.29-2.32 25
Sprinter S 2.29-2.32 25
Powerfit S300 2.29-2.32 20
A400/FT 2.29-2.32 20
PowerCycle 2.29-2.32 20
A500 2.32-2.35 20
A600 2.29-2.32 20
A700 2.29-2.32 20
Table 4: Charge voltage in buffer operation
c.) Switch-mode operation
When charging, the battery is separated from the
load. The charge voltage of the battery must be
set acc. to table 3 (max. values). The charging
process must be monitored. If the charge cur-
rent reduces to less than 1.5 A / 100 Ah C
10
, the
mode switches to float charge acc. to item 2.3 or
it switches after reaching the voltage value acc.
to table 3.
d.) Battery operation (charge-/discharge
operation)
The load is only supplied by the battery. The
charging process depends on the application
and must be carried out in accordance with the
recommendations of the battery-manufacturer.
2.3 Maintaining the full charge (float charge)
Devices complying with the stipulations under
DIN 41773 must be used. They are to be set so
that the average cell voltage is acc. to table 2.
2.4 Equalizing charge
Because it is possible to exceed the permitted
load voltages, appropriate measures must be
taken, e.g. switch off the load. Equalizing charg-
es are required after deep discharges and/or
inadequate charges. They can be carried out
with 2.40 Vpc (A500: 2.45 Vpc) for up to 48 hours
and with unlimited current.
The cells / bloc temperature must never exceed
45 °C. If it does, stop charging or revert to float
charge to allow the temperature to drop.
2.5 Alternating currents
When recharging up to 2.40 Vpc under operation
modes 2.2 the actual value of the alternating
current is occasionally permitted to reach
10 A (RMS) / 100 Ah C
10
. In a fully charged state
during float charge or standby parallel operation
the actual value of the alternating current must
not exceed 5 A (RMS) / 100 Ah C
10
.
2.20
2.25
2.30
2.35
2.40
2.45
0510 15 20 25 30 35
40
Temperature [° C]
Voltage [Vpc]
Nominal Value
The charging voltage should be set to the nominal value, the maximum value must not be exceeded
Maximum value
Float
Fig. 1: Marathon L/XL and Powerfit S; charging voltage vs. temperature
10
en