Sears 200.71201 User Manual download pdf (Page 9)

Calculating charge time

The Hydrometer or Electronic Method

To find the time needed to fully charge your battery,

determine the battery's charge level with a hydrometer

or electronic Percent-of-Charge Tester. The following

table will help you convert hydrometer readings to

percent of charge values.

SPECIFIC PERCENT PERCENT OF

GRAVITY

OF CHARGE

CHARGE NEEDED

1.265 100%

1.225 75%

25%

1.155

25% 75%

1.120

0% 100%

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.

To convert Reserve Capacity to Amp Hours, divide

Reserve Capacity by 2, and add 16:

Amp Hours = Reserve Capacity +16

To calculate time needed for a charge:

• Find the percent of charge needed. (A battery at

50 percent charge that will be charged to 100

percent needs another 50 percent (.50),

• Multiply the Amp Hour rating by the charge

needed (.50) and divide by the charger rate

(1,5 amps),

• Multiply the result by 1,25 and you’ll have the

approximate time needed, in hours, to bring the

battery to full charge.

• Add one additional hour for a deep-cycle battery.

Example:

Amp Hour Rating x charge needed x 1.25 = hours

Charger Setting of

charge

20 fAH Ratingf x .50 (charge needed! x 1,25 = 8.33

1.5 (Charger Setting) hours

20 X .5 = 6.66 x 1.25 = 8.33

1.5

You would need to charge your 20-Ampere Hour Bat

tery for approximately 8 hours at the 1.5-Amp charge

rate using the above example.

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Sears 200.71201 User Manual Page 9

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