©
2017 Sensata Technologies
Page 33
Operation
falls below 170 VAC (or 85 VAC on either leg) – the charger stops charging to help stabilize the
incoming AC voltage.
The Charge mode provides up to four separate charging stages: Bulk Charging, Absorb Charging,
Float Charging, and Full Charge.
• Bulk
Charging:
This is the initial stage of charging. While bulk charging, the charger supplies
the battery with controlled constant current. The charger will remain in bulk charge until
the absorption charge voltage (determined by the Battery Type selection
*
) is achieved. The
inverter’s green LED stays on (solid) to indicate bulk charging.
• Absorb
Charging:
This is the second charging stage and begins after the absorb voltage has
been reached. Absorb charging provides the batteries with a constant voltage and reduces the
DC charging current in order to maintain the
Absorb Voltage
setting. The inverter’s green LED
fl
ashes once every second (fast
fl
ash) to indicate absorption charging for 2 hours (determined
by the Battery AmpHrs selection
*
), then switches to
fl
oat charging.
• Float
Charging:
The third charging stage occurs at the end of the absorb charging time.
While
fl
oat charging, the charge voltage is reduced to the
fl
oat charge voltage (per the Battery
Type selection
*
). In this stage, the batteries are kept fully charged and ready if needed by the
inverter. The inverter’s green LED
fl
ashes once every 8 seconds (slow
fl
ash) to indicate
fl
oat
charging. The Float Charging stage reduces battery gassing, minimizes watering requirements
(for
fl
ooded batteries), and ensures the batteries are maintained at optimum capacity.
• Full Charge (Battery Saver™ mode):
The fourth stage occurs after four hours in the Float
Charging stage. The Full Charge stage is designed to keep batteries fully charged over long
periods, and to prevent excessive loss of water in
fl
ooded batteries or drying out of GEL/AGM
batteries. In this stage, the charger is turned off and begins monitoring the battery voltage.
If the battery voltage drops low (25.4 VDC or less on 24-volt models, or 50.8 VDC or less on
48-volt models), the charger automatically initiates another four hours of
fl
oat charging.
Info:
If the battery voltage falls to the rebulk voltage (24.2V on 24-volt models or
48.4V on 48-volt models) or lower, the unit will begin another bulk charge.
*
These settings in the MS-PAE Series leave the factory with default values (see Table 3-2, Inverter/
Charger Default Values). These default values are adequate for most installations, however if you
determine that some of the values are not adequate they can be changed for your particular system.
The ME-RC50 or ME-ARC remote control may be purchased to adjust these settings.
Figure 3-3, Automatic 4-Stage Charging Graph
Constant
Current
Reduced
Current
Reduced
Voltage
Absorb
volts
Max
Charge
Rate
Increased
Voltage
Constant
Voltage
Monitored
Voltage
No Current
Monitored
Current
Bulk
Charging
Absorb
Charging
Float
Charging
Full
Charge
Goes to Full
Charge after
4 hours in
Float Charge
A bs or b
T im e
Float
volts
Time
DC
Voltage
DC
Current
