3201-750【PDF 1/2 页】BATTERY CHARGER 6 VOLT 0.8 AMP

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I nteliTender 150

The I NTELI Tender Model 150 is a battery charger, designed to charge

lead/acid batteries, with two key characteristics. First, the InteliTender output is

temperature compensated. Since the output of a lead acid battery changes as

temperature changes, it is vital that the output of the battery charger match these

characteristics. Second, the InteliTender is a three state float charger, as required

to properly maintain any lead-acid battery. Note: A float charger without

continuous temperature compensation will damage a battery. The three modes of

operation are:

1. Bulk Charge Mode - Used when the battery

has been discharged. This mode replaces 80% of

the charge to the battery.

2. Absorption Mode - A tapering current, replacing the final 20% of the charge to the

battery.

3. Float Mode - This mode maintains the battery’s electrolyte at the ideal specific gravity

regardless of the temperature of the battery. This weatherproofs the battery, eliminating

freezing and boil-off. It also prevents plate oxidation and sulfation.

The following two graphs illustrate how these functions are accomplished. The Model 150 actually becomes three unique instruments,

depending on the charge stored and the temperature of the battery. The first curve, Figure 1 , shows the current from the Model 150 as

it brings a 20 Amp Hour battery from full discharge to full charge. The second curve, Figure 2 , shows the voltage measured at the

battery’s terminals. Because the Model 150 has versions for several different voltage batteries, the data is given in “Volts per Cell”. To

obtain the battery voltage, multiply the number of cells times the voltage given in Figure 2 . For instance, a twelve volt battery has six

cells, so its Float Voltage would be 6 times 2.35 volts per cell, or 14.05 Volts.

During the first six hours of the charge cycle, the Model 150

supplies to the battery a constant current of 1.5 Amperes. As

the battery reaches 80% of its capacity, the Model 150 changes

to a constant voltage source, providing a tapering current

during the stage of charging that would be generating

increasing amounts of gas if the constant current were still

applied. Once the current to the battery reaches a pre-

programmed value, compensated for temperature, the Model

150 changes to its final mode of operation, that of a float

charger.

FIGURE 1

FIGURE 2

The management of the current flowing to the battery during

this process is critical if the process of energy storage is to be

optimized. Once the charge stored reaches the eighty percent

level, gas produced by charging increases. During the

Absorption Mode, the current tapers, generating a slower

increase in voltage for the same time interval. Finally, when

the battery is fully charged, the current ceases for a brief time

and the voltage falls to the Float Voltage. These critical break

points, ending Bulk Charge, ending Absorption Charge, and

Float Voltage are all temperature compensated, permitting

precise programming of these voltages, hence maximum

charge stored.

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