THREE-STAGE BATTERY CHARGER
Trace Engineering Co. Inc. Tel (360) 435-8826 Part Number 3179
5916 195
th
Street, NE Fax (360) 435-2229 Effective August 6, 1998
Arlington, WA 98223 USA www.traceengineering.com
Page
54
Table 5, Bulk and Float Setpoints
Typical BULK and FLOAT Setpoints for Common Battery Types (12V System)
Battery Type Bulk Volts Float Volts
Gelled Lead-Acid (sealed)
14.1 volts 13.5 volts
Liquid Lead-Acid (non-sealed)
14.5 volts 13.4 volts
Generator Requirements
The maximum charge rate of the battery charger is dependent upon the peak AC voltage available.
Since the battery charger uses only the top portion of the input sine wave, small variations in peak
voltage results in large variations in the amount of energy to the charger. This charger's output is
rated on the basis of public power input, which typically has a peak voltage of 164 volts (230 volt AC
power has a peak of 330 volts).
It takes a powerful AC generator to maintain the full 164 volt peak while delivering the current
necessary to operate the charger at its maximum rate (typically 5KW for 2500 VA models and 6 kW
for 3000 VA models). Smaller generators will have the tops of their waveform clipped under such
loads. Running at these reduced peak voltages will not harm the charger, but it will limit the
maximum charge rate. Large auxiliary AC loads may exacerbate this problem.
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