Prepared date
Approved date
File number
S230XLP03
Page
11/24
Version
A
5.3 Float charge method for an 12V battery
If you hold the voltage of the battery system at the end-of-charge voltage (after reaching 100%
SOC) for prolonged periods of time, lower the end-of-charge voltage to the recommended
float-charge voltage. Determine the recommended float voltage by multiplying the number of
batteries connected in series by the recommended float-charge voltage of a single battery (13.8
V), as shown in Equation 2.
Eq. 2 (Number of batteries in series) x (13.8 V) = Float Charge Voltage, battery system
5.4 Fast charge method for parallel strings
We strongly recommend to charge a battery system by the maximum continuous charge current
for a single battery. If we have to fast charge a battery system,
multiply the number of batteries
connected in parallel by the maximum continuous charge current for a single battery (see
specification please, for example 10A) and multiply a factor (0.5), as shown in Equation 3. You
can determine the maximum charge voltage by multiplying the number of batteries connected in
series by the charge voltage of a single battery (14.6 V). Charge the battery system at its
maximum continuous charge current until you reach its maximum recommended charge voltage.
Apply a constant voltage hold at the maximum recommended charge voltage until the total
charge time reaches the fast charge time. Do not attempt a fast charge outside the
recommended temperature range and stop if the battery exhibits signs of overheating, such as
the battery current disappearing during a charge.
Eq. 3 (Number of batteries in parallel) x (10 A) x 0.5 = Fast Charge Current, battery system
6
Discharging The Batteries
6.1 Recommended discharge method for strings
We strongly recommend to discharge a battery system by the maximum continuous discharge
current for a single battery.
Determine the maximum continuous discharge current for a battery
system by multiplying the number of batteries connected in parallel by the maximum continuous
discharge current for a single battery (see specification please, for example 10A) and multiply a
factor (0.5), as shown in Equation 4.
Eq. 4 (Number of batteries in parallel) x (10 A) x 0.5= Max Discharge current, string
6.2 Discharge temperature limits
12V Smart Battery
User Guide
