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D2020N User Guide
The Battery Charging Process
When charging your battery, the controller moves automatically
through the following charging sequence:
Boost phase - In this phase, all available charge is used to
charge the battery as quickly as possible. When the battery is
charging in the Boost phase, the “Boost” indicator appears on
the controller’s screen.
Absorption phase - The battery is nearly full. To avoid excess
gassing, the charge current is now adjusted to keep the
battery at a lower, constant voltage.
Float phase - The battery is fully charged, so the controller now
maintains the battery at a lower voltage. If the battery voltage
drops below a pre-set point, the controller will move back to
the Boost phase automatically.
For flooded batteries, the controller will occasionaly do a
deliberate overcharge of the battery. This is called Equalisation.
This phase helps level the charge between the different cells
inside the battery by overcharging the battery for a short period.
It will do this several times each year.
Figure 7 shows how the voltage of the battery varies during the
charging process. The regulation settings shown in the diagram
(BMAX, ETIM etc) can all be set individually in Program 4. This
caters for the requirements of unusual installations.
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