Calculating charge times

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-Cranking Amps (CCA), or both.

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

•NR means that the charger setting is NOT RECOM-

MENDED.

Find your battery’s rating on the chart below and note the charge time given for each charger setting. The times given are for batteries with a 50-percent charge. Add more time for totally discharged batter- ies.

 

BATTERY SIZE/RATING

 

 

CHARGE RATE/CHARGING TIME - HOURS

 

 

 

2 AMP

40 AMP

 

 

 

 

 

 

SMALL

 

Motorcycle, garden

6

- 12 AH

2 - 4

NR

BATTERIES

 

tractor, etc.

12

- 32 AH

4 - 10

NR

 

 

200

- 315 CCA

40

- 60 RC

11 - 14

30 to 45 min.

CAR/TRUCKS

 

315

- 550 CCA

60

- 85 RC

14 -18

45 min. to 1 hour

 

 

550

- 1000 CCA

85

-190 RC

18 - 35

1 - 2

MARINE/DEEP CYCLE

 

80 RC

18

NR

 

140 RC

27

NR

 

 

 

 

 

 

 

 

160 RC

30

NR

 

 

 

 

 

 

 

 

 

 

 

180 RC

33

NR

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 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

2

NOTE: The Reserve Capacity can be obtained from the battery specification sheet or the owner's manual.

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 or 10 amps).

•Multiply the result by 1.25 and you’ll have the 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 % of charge needed x 1.25 = hours

Charger Setting

of

charge

100 (AH Rating) x .50 (charge needed) x 1.25 =

6.25

40 (Charger Setting)

hours

100 x .50 = 1.25 x 1.25 = 1.5625

 

40

 

You would need to charge your 100-Ampere Hour Battery for approximately 1½ hours at the 40-Amp charge rate using the above example.

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Sears 200.71231 owner manual Calculating charge times, Chart Method, Hydrometer or Electronic Method
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200.71231 specifications

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