Schumacher PSC-2030T - Manual (Page 9)

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5. Crank the engine until it starts or 5
seconds pass. If the engine does not
start, wait 3 minutes before cranking
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 the
volt/amp selector switch and timer to
the OFF position and unplug the AC
power cord before disconnecting the
battery clamps 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.
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
2
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.
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
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.
BATTERY CHARGING TIMES
BATTERY SIZE/RATING
CHARGE RATE /
CHARGING TIME
10A 30A
CARS/TRUCKS
200-315 CCA 40-60 RC 2¼-3 hours ¾-1 hour
315-550 CCA 60-85 RC 3-3¾ hours 1-1¼ hours
550-1000 CCA 85-190 RC 3¾-7 hours 1¼-2¼ hours
MARINE/DEEP CYCLE
80 RC 3½ hours NR
140 RC 5½ hours NR
160 RC 6 hours NR
180 RC 6½ hours NR