Calculating charge time, Battery rating method, Voltmeter method – Sears 200.713101 User Manual
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CALCULATING CHARGE TIME
Battery Rating Method
Use the following table to more accurately determine the time it will take to fully charge a
battery that is initially at 50% State-of-Charge. identify your battery type and its associated
Charge Time in the table. Common battery types are:
•
Small batteries, motorcycles, garden tractors, etc., are usually rated in Amp-Hours
(AH).
•
Car and truck batteries, usually rated in Reserve Capacity
(RC),
Cold-Cranking Amps
(CCA).
•
Marine, or deep cycle batteries are usually rated in either Amp-Hours or Reserve
Capacity
(RC).
Charge Time Table for Batteries at 50% State-of-Charge
Battery
Type
Battery Rating
Charge-Time (Hours)
AH
RC
CCA
2 AMP
10 AMP
60 AMP
Motorcycle
and T ractor
6 - 12
2-4
NA
NA
12-32
4- 10
NA
NA
Car and
Truck
40 - 60
200 - 315
8 - 11
1 -2
NA
60 - 85
315 - 550
11 - 16
2-3
NA
85 -190
550 - 1000
16 - 35
3-7
NA
Marine and
Deep Cycle
40
80
15
3
NA
80
140
26
5
NA
95
160
30
6
NA
105
180
33
7
NA
NA = Not Allowed. DO NOT charge at this setting.
Voltmeter Method
To find the time needed to fully charge your battery, determine the battery’s charge level
with a voltmeter or electronic State-of-Charger Tester. Use the table below to convert
Voltmeter and State-of-Charge readings at room temperature to the appropriate Charge
Factor. Then use the formulas that follow the table to determine the approximate charge
time.
Charge Factor Table
Voltmeter Reading
State-of-Charge
Reading
Charge Factor
12 Volt Battery
6 Volt Battery
12.67
6.34
100%
0
12.45
6.22
75%
0.25
12.25
6.12
50%
0.50
12.06
6.03
25%
0.75
11.86
5.93
0%
1
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