800.261.3602
Revised 07/18
Charging Graph & Stage Description
Stage 1 – Soft Charge
When the batteries are discharged below 10VDC, the controller will softly ramp the battery
voltage up to 10VDC before applying the full bulk.
Stage 2 – Bulk Charge
Maximum charge current from solar panels until the batteries rise to the absorption voltage.
Stage 3 – Absorption Charge
Battery voltage is maintained at a constant voltage using PWM technology to finish charging the
batteries to a 100% of charge.
Stage 4 – Battery Equalization Charge
Battery Equalization is only available for (WET) flooded led acid battery. When the battery voltage
has dropped below 12.0VDC the controller will automatically run the equalization stage to bring
the internal cells of the batteries to an equal state and reverse the loss of capacity to being
discharged below 12.0VDC once every 28 days.
Stage 5 – Float Charge
The Batteries are fully charged at this point and are maintained at a safe voltage level. During the
float charge the controller is constantly adjusting its PWM control to adjust for varying solar
charging currents and trailer loads to maintain a float voltage of 13.7VDC.
Stage 6 – Automatic Boost Charge
When the controller is in float charge and the trailer loads are greater than the solar charging
current and the battery voltage is pulled below 13VDC, the controller will set an auto boost flag
and when loads are reduced, it will perform a bulk/absorption charge restoring the batteries to
100% and then return to the float charge.
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