Sears 200.71460 owner manual Chart Method, Hydrometer or Electronic Method, AMP 20AMP 60AMP

Calculating charge time

The Chart Method

Use the following table to more accurately determine the time it will take to bring a battery to full charge.

First, identify where your battery fits into the chart.

•Small batteries-- motorcycles, garden tractors, etc.

--are usually rated in Ampere Hours (AH). For example; 6 to 12 AH, or 12 to 32 AH.

Batteries in cars and smaller trucks are usually rated in Reserve Capacity (RC), Cold-CrankingAmps (CCA), or both.

•Marine, or deep-cycle batteries are usually rated in Reserve Capacity (RC).

•NR means that the charger setting is NOT RECOMMENDED.

Find your battery's rating on the following chart and note the charge time given for each charger setting. The times given are for batteries with a 50-percent charge prior to recharging. Add more time for severly discharged batteries.

CHARGE RAT_CHARGiNG TIME, HOURS

				2 AMP	20AMP	60AMP
SMALL	Motorcycle, garden		6-12AH	2-4	NR	NR
BAI-FERIES	tractor, etc.		12-32AH	4-10	NR	NR
	200	- 315 CCA	4O - 6O RC	11 -14	1 - 11/2	3/8- 1/2
CARFRUCKS	315	- 550 CCA	60 - 85 RC	14-18	1I/2 - 2	112- Slo
	550	- 1000 CCA	85 -190 RC	18-35	2 - 31/2	el8 - 1
MARINE/DEEP	CYCLE		80 RC	18	13/,=	NR
			140 RC	27	23/4	NR
			160 RC	30	3	NR
			180 RC	33	31/2	NR

The Hydrometer or Electronic Method

To find the time needed to fully charge your battery, determine the battery'scharge level with a hydrometer or electronic Percent-of-Charge Tester. The following table will help you convert hydrometer readings to percent of charge values.

1.265 100% 0%

1.22575%25%

1.15525%75%

1.1200%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

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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 setting (2, 20 or 60 amps).

Multiply the result by 1.25 and you'llhave the time needed, in hours, to bring the battery to full charge.

Add one additional hour for a deep-cyclebattery.

Example:

Amp Hour Rating x % of charge needed x 1.25 = hours

	Charger Setting			of
				charge
				needed
100	(AH Ratinq)	x .50 (charqe needed)		x 1.25 -- 3.125
	20	(Charger	Setting)	hours
100	x .50 -- 2.5 x 1.25 =		3.125
2O

You would need to charge your 100-Ampere Hour Bat- tery for a little more than 3 hours at the 20-Ampcharge rate using the above example.

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