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%	0%

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 Settingof charge

20 (AH Rating) 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.

Sears 201- Sch 506 1/9/98

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