Schumacher PS-5250 User Manual download pdf (Page 7)

I. ENGINE START

1. Set charge rate switch and timer to OFF positions. (No timer

on Model 2352.)

2. With the charger unplugged from the AC outlet, connect

the charger to the battery following instructions given in

section F.

3. Plug the charger AC power cord into the AC outlet, then

move timer from OFF to HOLD position. (No timer on PS-

2352).

4. Set the charge rate switch to the engine start position that

matches the vehicle battery and then crank the engine. Fol-

low the duty cycle printed on the front panel of your charger

for proper ON / OFF times. During extremely cold weather

or when the battery is severely exhausted, charge the bat-

tery for about 5 minutes before cranking the engine.

5. If the engine fails to start, charge the battery for 5 more

minutes before attempting to crank the engine again.

6. After the engine starts, move the charge rate switch to OFF

and unplug the AC power cord from the outlet before dis-

connecting DC clamps.

Do not try to engine start a vehicle without a battery in it. You

may damage the vehicle’s system. If the engine spins, but doesn’t

start after several starting attempts, there is a problem with the

engine of the vehicle other than its starting system. STOP crank-

ing the engine until the other problem has been found and cor-

rected.

J. CHARGE PERIOD

Determine the charge level of your battery with a hydrometer or

electronic percent of charge tester. Determine the ampere hour

rating of your battery. It may be on the battery information label.

If the battery is rated in reserve capacity, convert to ampere

hour rating using the following formula:

Ampere Hour rating =

(Reserve Capacity) + 16

Example: AH rating = (168 Reserve Capapcity + 16

or AH = 100

Note: Reserve capacity is in minutes.

Use the following formula to determine the time of charge re-

quired:

(AH x % of charge needed) divided by amp setting of the

charger, times 1.25 = hours of charge

Example:

State of charge of the battery is 50%

Percent of charge needed is 100% - 50% = 50%

(0.50 decimal)

Ampere rating of the battery is 100AH

Charger setting is 10 Amps

100 x 0.50 = x 1.25 = 6.25 hours of charge needed

10 +

1.00 hour more if charging a deep

cycle battery

7.25 hours total for a deep cycle

battery.

A hydrometer reading of the specific gravity of the electrolyte

(fluid) of the battery in good condition should be between 1.25

and 1.28.

When a battery reaches 80–85% of full charge, bubbles will

appear on the surface of the fluid. As the battery nears full charge,

bubbling will become more vigorous.

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Schumacher PS-5250 User Manual Page 7

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