Calculating Charge Time - Schumacher Electric SE-1520 Manual Del Usuario

NOTE: If you have charged the battery
and it still will not start your car, do not
use the Engine Start feature, or it could
damage the vehicle's electrical system.
Have the battery checked.
1. Set switch #2 to the OFF position.
2. With the charger unplugged from the
AC outlet, connect the charger to the
battery following the instructions given
in the CHARGING A BATTERY IN
THE VEHICLE section.
3. Plug the charger AC power cord into
the AC outlet.
4. With the charger plugged in and
connected to the battery of the
vehicle, set switch #1 to the engine
start position, and set switch #2 to the
down position.
5. Crank the engine until it starts or 3
seconds pass. If the engine does not
start, wait 6 minutes before cranking

12. 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
BATTERIES garden tractor, etc.
CARS/
TRUCKS
MARINE/DEEP-CYCLE
2
Motorcycle,
200-315 CCA
315-550 CCA
550-1000 CCA
again. This allows the charger and
battery to cool down.
NOTE: During extremely cold weather, or
if the battery is under 2 volts, charge the
battery for 5 minutes before cranking the
engine.
6. If the engine fails to start, charge the
battery for 5 more minutes before
attempting to crank the engine again.
7. After the engine starts, move switch
#2 to the OFF position and unplug the
AC power cord before disconnecting
the battery clips from the vehicle.
8. Clean and store the charger in a dry
location.
NOTE: If the engine does turn over but
never starts, there is not a problem with
the starting system; there is a problem
somewhere else with the vehicle. STOP
cranking the engine until the other problem
has been diagnosed and corrected.
Example:
Ah rating x % of charge needed x 1.25 = hrs of
charge
100 (Ah rating) x .50 (charge needed) x 1.25 = 3.125 hrs
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
NR – the charger setting is NOT
RECOMMENDED.
CCA – Cold Cranking Amps
RC – Reserve Capacity
The times given are for batteries with a
50% charge prior to recharging.
CHARGE RATE/CHARGING TIME
2 AMP
6-12 Ah 2-3¾ hrs
12-32 Ah 3¾-10 hrs
40-60 RC 11¼-14½ hrs
60-85 RC NR
80-190 RC NR
80 RC NR
140 RC NR
160 RC NR
180 RC NR
• 8 •
Charger Amp setting
20 (Charger Setting)
20 AMP
NR
NR
1-1½ hrs
1½-2 hrs
2-3½ hrs
1¾ hrs
2¾ hrs
3 hrs
3¼ hrs
55 AMP
NR
NR
25-32 min
32-40 min
40-76 min
NR
NR
NR
NR