Calculating Charge Time - Schumacher ProSeries PSW-22 Guide D'utilisation

USING THE BATTERY LOAD TESTER
(Model PSW-3060 only)
1. Confirm that the charger is unplugged.
2. Select the correct setting of the meter
(6V or 12V) to match the battery to be
tested.
3. Set the charge rate switch and the
timer to the OFF position.
4. Connect the battery following the
precautions listed in Sections 6 and 7.
5. Press the Load Switch to LOAD ON
for 10 seconds while reading the
voltmeter.
Green – Indicates the battery capacity is
OK. The battery may or may not be fully
charged. Check the specific gravity to
determine the state of charge. If the specific
gravity shows less than a full charge,
check for an electrical drain on the battery
or for possible charging system problems.
Recharge the battery to full charge.
Yellow or Red, but the needle remains
steady – Indicates that the battery
capacity is not satisfactory. The battery
may be either defective or not fully

13. CALCULATING CHARGE TIME

When you know the percent of charge and
the Amp hour (Ah) rating of your battery,
you can calculate the approximate time
needed to bring your battery to a full charge.
Example:
Amp hour rating = Reserve capacity + 16
NOTE: The Reserve Capacity can be
obtained from the battery's specification
sheet or the owners manual.
To calculate the time needed for a charge:
1. Find the percentage of charge needed.
2. Multiply the Amp hour rating by the
charge needed, and divide by the
charge rate.
3. Multiply the results by 1.25 to find the
total time needed, in hours, to bring
the battery to full charge.
4. Add an additional hour for a deep-
cycle battery.
BATTERY SIZE/RATING
SMALL Motorcycle,
BATTERIES garden tractor, etc.
200-315 CCA
CAR/TRUCK 315-550 CCA
550-1000 CCA
MARINE/DEEP CYCLE
2
1.5-2A 4-5A
6-12 Ah 2-5 h 1-2 h
12-32 Ah 3¾-13½ h 2-5 h
40-60 RC 11¼-19 h 5½-7¼ h
60-85 RC NR 7¼-9¼ h
85-190 RC NR 9¼ -17½ h
80 RC NR 8¾ h
140 RC NR NR
160 RC NR NR
180 RC NR NR
charged. Check the specific gravity of the
battery to see which condition exists. If
charging does not bring the battery up to a
full charge, the battery should be replaced.
Yellow or Red, but the needle continues
to fall – Indicates the battery may be
defective or rundown. Release the load
switch, and note the voltmeter reaction.
Voltage recovery into the green or above
within seconds indicates a defective
battery. A slow recovery indicates a
rundown condition. For best results, check
the specific gravity of the battery.
GENERAL CHARGING NOTES
Fan: The charger is designed to control
its cooling fan for efficient operation.
Consequently, it is normal for the fan to
start and stop when maintaining a fully
charged battery. Keep the area near the
charger clear of obstructions to allow the
fan to operate efficiently.
Voltage: The voltage displayed during
charging is the charging voltage and is
usually higher than the battery's resting
voltage.
Example:
Ah rating x % of charge needed x 1.25 = hrs of charge
Charger Amp setting
100 (Ah rating) x .50 (charge needed) x 1.25 = 3.125 hrs
20 (Charger Setting)
100 x .50 x 1.25 = 3.125
20
You need to charge a 100 Ampere hour
battery for a little more than 3 hrs at the 20
Amp charge rate, using this example.
Use the following table to determine the time
it will take to bring a battery to full charge.
Ah – Ampere Hours
CCA – Cold Cranking Amps
RC – Reserve Capacity
NR – The charger setting is NOT
RECOMMENDED.
The times given are for batteries with a
50% charge prior to recharging.
CHARGE RATE/CHARGING TIME
10A 20A 30A
NR NR NR
NR NR NR
2¼-3 h 1-1½ h ¾ -1 h
3-3¾ h 1½-2 h 1-1¼ h
3¾-7 h 2-3½ h 1¼-2¼ h
3½ h 1¾ h NR
5½ h 2¾ h NR
6 h 3 h NR
6½ h 3¼ h NR
11
• •
35A 40A 60A
NR NR NR
NR NR NR
40-50 min ½-¾ h 23-29 min 17-22 min
50-60 min ¾ -1 h 29-37 min 22-28 min
1-2 h 1-1¾ h 37-70 min 28-52 min
NR NR NR
NR NR NR
NR NR NR
NR NR NR
80A
NR
NR
NR
NR
NR
NR