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 RECOMMENED.

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 prior to recharging. Add more time for severely discharged batteries.

 

BATTERY SIZE/RATING

 

 

CHARGE RATE/CHARGING TIME - HOURS

 

 

 

2 AMP

10 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

2 - 27/8

CAR/TRUCKS

 

315

- 550 CCA

60

- 85 RC

14 -18

27/8 - 33/4

 

 

550

- 1000 CCA

85

-190 RC

18 - 35

33/4 - 7

MARINE/DEEPCYCLE

 

80 RC

18

31/2

 

140 RC

27

51/2

 

 

 

 

 

 

 

 

160 RC

30

6

 

 

 

 

 

 

 

 

 

 

 

180 RC

33

7

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

2

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 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

100 (AH Rating) x .50 (charge needed) x 1.25 = 6.25

10 (Charger Setting)

hours

100 x .50 = 5 x 1.25 = 6.25

10

You would need to charge your 100-Ampere Hour Bat- tery for approximately 6¼ hours at the 10-Amp charge rate using the above example.

8

Sears 003 - Sch 549 11/2/95

Page 8 Page 10
Page 9
Image 9
Sears 47003 owner manual Calculating charge time, Chart Method, Hydrometer or Electronic Method
Page 8 Page 10

47003 specifications

Sears 47003, a significant entry in the realm of power tools, has garnered attention for its innovative features and robust design. As part of Sears’ extensive lineup, this model combines reliability with performance, catering to both DIY enthusiasts and professional tradespeople alike.

One of the standout features of the Sears 47003 is its powerful motor, which ensures efficient operation across a variety of tasks. The motor’s design not only enhances durability but also provides consistent power, making it suitable for heavy-duty projects. Users have emphasized the tool's ability to handle tough materials, offering a seamless experience whether you're cutting wood, metal, or plastic.

The ergonomic design of the Sears 47003 further elevates its usability. The handle is crafted to reduce fatigue, allowing for extended periods of use without compromising comfort. This thoughtful construction incorporates soft grip materials, ensuring a secure hold even in the most challenging settings. Additionally, the balanced weight distribution of the tool helps to prevent strain on the arms and wrists, making it an excellent choice for longer jobs.

Technologically, the Sears 47003 is equipped with an advanced electronic speed control feature. This allows users to adjust the speed to match the specific requirements of their task, providing greater precision and control. Furthermore, the integrated safety features, such as a blade guard and an emergency shut-off switch, showcase Sears’ commitment to user security, making it an even more attractive option for both novices and experts.

Another important characteristic of the 47003 is its compatibility with a wide range of accessories. This versatility not only enhances its functionality but also enables users to customize their tool setup according to their specific project needs. Whether you require precision drilling or more robust cutting, the comprehensive accessory options afford users the freedom to adapt the tool as necessary.

In summary, the Sears 47003 stands out in the competitive power tool market due to its powerful motor, ergonomic design, advanced technological features, and versatile compatibility. Whether tackling home improvement projects or engaging in professional work, this tool is engineered to meet a variety of demands, making it a valuable addition to any toolkit.
Top Page Image Contents