Sears 200 Owner's Manual download pdf (Page 11)

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-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

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. Add more time for totally discharged batteries.

SMALL

BAFFERIES

CAR_RUCKS

BATrERY SIZE/RATING

Motorcycle, garden

tractor, etc.

20O - 315 CCA

315 - 550 CCA

550 - 1000 CCA

MARINE/DEEP CYCLE

6-12AH

12-32 AH

40 - 60 RC

60 - 85 RC

85 -190 RC

8O RC

140 RC

160 RC

180 RC

CHARGE RATE/CHARGING TIME - HOURS

2 AMP

2-4

4-10

11 -14

14-18

18 - 35

40 AMP

1/2- 3/4

3/4- 1

1-2

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

3ercent of charge values.

SPECIFIC PERCENT PERCENT OF

G_V TY 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

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 rati6g by the charge

needed (.50) and divide by the charger setting (2

or 40 amps).

• Multiply the result by 1.25 and you'll have the time

need, in hours, to bring the battery to full charge.

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

Example:

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

Charger Setting of

charge

needed

100 {AH Rating) x .50 (charqe needed) x 1.25 = 1.5625

40 (Charger Setting) hours

100 x :50 = 1.25 x 1.25 = 1.5625

You would need to charge your 100-Ampere Hour Bat-

tery for a littlemore than 1.5 hours atthe 40-Amp charge

rate using the above example.

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Sears 200 Owner's Manual Page 11

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