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Amp hours = reserve capacity + 16 2 – Sears 28.71234 User Manual

Page 17

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15

BATTERY SIZE/RATING

ChARGE RATE/

ChARGING TIME - hOURS
2 AMP 20 AMP 60 AMP

SMALL

BATTERIES

Motorcycle, gar-

den, tractor, etc.

6 - 12 AH

2 - 4

NR

NR

12 - 32 AH

4 - 10

NR

NR

CAR/TRUCKS

200 - 315 CCA

40 - 60 RC

11 - 14

60 - 90

min.

20 - 30

min.

315 - 550 CCA

60 - 85 RC

14 - 18 90 - 120

min.

30 - 40

min.

550 - 1000 CCA

85 - 190 RC

18 - 35

2 - 3.5

hrs.

45 - 60

min.

MARINE/DEEP CYCLE

80 RC

18

105 min.

NR

140 RC

27

2 hrs.,

45 min.

NR

160 RC

30

3 hrs.

NR

180 RC

33

3.5 hrs.

NR

The hydrometer or Electronic Method

14.2

To find the time needed to fully charge your battery, determine the bat-

tery’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 GRAvITY

PERCENT OF ChARGE PERCENT OF 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

2

NOTE: The Reserve Capacity can be obtained from the battery specifica-

tion 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