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Battery Rating Method
Use the following chart to determine the approximate time it will take to fully charge a
battery that isinitially at 50% State-of-Charge. Identify your battery type and its
associated Charge Time in the table. Common battery types are:
• Small batteries, motomycles, garden tractors, etc., usually rated in Amp-Hours (AH).
• Car and truck batteries, usually rated in Reserve Capacity (RC), Cold Cranking
Amps (CCA), or both.
• Marine, or deep cycle batteries, usually rated in either Amp-Hours or Reserve
Capacity (RC).
Chart
le Time Table for Batteries at 50% State-of-Charge
Motorcycle 6-12 2 - 4 NA NA
and Tractor 12-32 4 -10 NA NA
40-60 200-315 8- 11 1 - 1½ NA
Car and 60-85 315-550 11 - 16 1½-2 NA
Truck
85-190 550-1000 16 - 35 2 - 5 NA
Marine and 40-80 80-140 15 - 26 1 - 2 NA
Deep Cycle 80-105 140-180 26 - 33 2 - 5 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-Charge 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
......... ' State-of:charge I
12 Volt Battery 6 Volt Battery Reading Charge Facto_
12.67
12.45
12.25
12.06
11.86
6.34 100%
6.22 75%
6.12 50%
6.03 25%
5.93 0%
0
0.25
0.50
0.75
1
11
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