Ultimate Power UP1200PCUL User Manual page 7

Inverter Status Panel (on top of the inverter)
There are 3 main charging processes:
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.
Software timer will measure the time from A/C start until the battery charger reaches 0.3V below the boost voltage, then
take this time asT0 and T0×10 = T1
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.
In this period, the inverter will start a T1 timer; the charger will keep the boost voltage in Boost CV mode until the T1
timer has run out. Then drop the voltage down to the float voltage. The timer has a minimum time of 1 hour and a
maximum time of 12 hours
Float Charging:
The third charging stage occurs at the end of the Absorb Charging time. While Float charging, the charge voltage is
reduced to the fl oat charge voltage (determined by the Battery Type selection*). In this stage, the batteries are kept
fully charged and ready if needed by the inverter.
If the A/C is reconnected or the battery voltage drops below 12Vdc, the charger will reset the cycle above.
If the charge maintains the float state for 10 days, the charger will deliberately reset the cycle to protect the battery.
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