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Selector 12 Volt 6 Volt
Switch Battery Battery
12V 1 2
24V 2 4
36V 3 6
48V 4 8
60V 5 10
72V 6 12
L. AMP SELECTOR SWITCH
The charge rate of either 5 or 10 Amp maybe selected for any selected output
voltage.
M. CHARGE PERIOD AND TIMER SETTING
The approximate time required to bring a battery to a fully charged state depends upon
the number of Ampere Hours (AH) depleted from the battery. AH’s are determined by
multiplying the number of hours times the number of Amps supplied by a battery to a load.
For example: If a load was connected to a battery which drew 10 Amps for a period of
4 hours, the battery will have supplied 40 AH. The approximate recharge time would then
be calculated by dividing the 40 AH depleted from the battery, by the ampere charge rate
of the battery charger. Add an extra 20% for tapering of the charge rate and battery
recharge inefficiency.
The required charge period for the above conditions would be approximately 5 hours. That
Is, 10 Amps (depleted) x 4 (discharge period in hours) - 10 Amp (charger output rate) x
1.20 = 4.8 hours which = 4 hours and 48 minutes.
Another method to determine the required charge period is by means of performing a
hydrometer test. Measure the specific gravity of the electrolyte, corrected for 80° F (26.7°
C), of each cell.
Two common types of hydrometers are:
Types calibrated in terms of specific gravity (a common scale being 1.120 to 1.265) or the
type which use four colored balls to Indicate state of charge. There are many types
available. Read and follow the instructions that are provided with each type.
Specific Gravity Value State of Charge Floating Balls
1.265 100% 4
1.225 75% 3
1.190 50% 2
1.155 25% 1
1.120 Discharged *
*No balls float in the barrel of the hydrometer.
If you have a 70H rated battery, and its hydrometer reading indicates a 25% state of charge,
then 52.5 AH are needed to bring the battery back to 100% of charge.
(70AH - (.25 x 70)) = 52.5 AH
Charge period would be calculated as follows.
52.5 AH -1- 10 (amp rate) x 1.20 (120%) = 6.3 hours or 6 hours and 18 minutes. The timer would
be set to 6.5 hours for this example.
If the charge rate switch is set to 5 Amps the charge time will be twice as long.
Indications of a fully charged battery are:
When the ammeter indicates the charge rate has tapered to approximately one half the charger
rated output.
A hydrometer reading of the specific gravity of the electrolyte (fluid) of the battery in good
condition should be between 1.250 and 1.285.