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Introduction
975-0288-01-01 1–5
Battery Charger Features
Charging
Settings
The Battery Charger in the PowerHub 1800 has three pre-set charging
profiles.
• 40 A Profile (Default Setting). With the 40-amp Charging Profile, the
maximum bypass power for AC output to loads is approximately
600 W (4 A) with a 15 A input breaker. Use this mode to minimize
battery charging time.
• 10 A Profile. With the 10-amp Charging Profile, the maximum
bypass power for AC output to loads is approximately 1400 W (12 A)
with a 15 A input breaker. Use this mode when other DC charging
sources are available, or if there is a high demand on AC output with
battery charging a low priority.
• 0 A Profile. When Charger Setting 0 A is selected, the Battery
Charger is disabled and will not charge the batteries. Use this mode if
other DC charging sources are available or if it is necessary to
temporarily disconnect the AC charging system.
See “Battery Charger Specifications” on page A–3 for details on the
specific profile parameters.
Charging
Process
The Battery Charger uses a three-stage charging process to maintain the
battery (or batteries) in operational condition. This process is illustrated in
Figure 1-3, “Three-Stage Charging Process” on page 1–6.
Bulk Stage The bulk stage will start upon connection of AC and with the unit turned
on. The constant current mode is limited to 40 A or 10 A depending on
setting. The voltage setpoint for this stage is 14.2 Vdc. The Charger will
transition to the Absorption Stage upon reaching the bulk voltage
setpoint.
Absorption
Stage
In the Absorption Stage, the constant voltage mode is limited to 14.2 Vdc.
The current will drop as the batteries charge. Upon dropping to 4 A, the
unit will transition to the Float charge. This stage will not exceed 4 hours
maximum.
Float Stage In the Float stage, the constant voltage mode limited to 13.7 Vdc. An
8-hour timer is started at this point.
If, during the 8-hour timer, the current rises to 6 A, the unit transitions
back to the Bulk Stage and starts over.
If the unit stays at 4A or less for the entire 8 hour timer, it will transition
to Standby Mode.