Owners Manual
SILENT RUNNER INVERTER/CHARGER POWER SYSTEM
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supplies a constant current charge output. Connect an ammeter to the DC cables between the inverter and the
battery to monitor the current (DC amps), and a volt meter to the battery to monitor the battery voltage
rising.
After some time, the battery voltage rises to the Absorption voltage (14.4 VDC for wet batteries or 14.1
VDC for gel batteries). The Charger-Bulk light continues to flash, indicating the charger is in Bulk or
Absorption mode. The battery voltage remains constant (Absorption voltage value), and the charger output
current tapers off. After approximately twenty minutes, the charge advances to Float mode. The Charger
Float Light turns ON and the battery voltage drops to the float voltage value (13.2 VDC for wet batteries or
13.6 VDC for gel batteries). The charger will remain in this stage until shore power is removed or until the
battery will again accept the bulk charge amperage.
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THEORY OF OPERATION
Battery Charger Operation
The Silent Runner Battery Charger incorporates an automatic, three-stage charger. This design enables the unit to
automatically charge batteries, maintaining the battery's integrity and reducing the likelihood of premature failure.
The battery charger is designed to be used with lead-acid type batteries including sealed and gel types, but not for
nickel-cadmium (Ni-Cad) or nickel-iron types.
There are three automatic charge stages; Bulk, Absorption, and Float.
Bulk Charge Stage
The Bulk Charge Stage (fixed current) provides a fixed charging current for rapid charging of the battery bank. The
charger output current is adjustable, 15-Amp or 55-Amp, to match the charging requirements of the battery. The
Bulk Stage is initiated when the battery will accept the charging amps selected. As the battery accepts charge the
battery voltage will rise to the charger's Bulk Voltage value, 14.4 VDC for flooded batteries, or 14.1 VDC for gel
batteries. When battery voltage reaches the Bulk Voltage Value the Bulk Charging Stage is complete. At this point,
the battery is approximately 80-percent charged.
Absorption Charge Stage
During Absorption Charge Stage (fixed voltage), the charger's output voltage remains fixed at the Bulk Charge value
and the output current will decrease as the battery becomes fully charged. The Absorption Stage ends after twenty
minutes and the charger advances to the Float Stage.
Float Charge Stage
When the charger enters Float Stage, its output voltage is reduced to the float voltage value 13.2 VDC for flooded
batteries, or 13.6 VDC for gel batteries. This setting is sufficient to keep the battery charged, but not so high as to
boil or over-charge the batteries. The charger will remain in Float Stage until the battery will accept the Bulk Charge
Output Amps selected.
