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18
Bulk Charge: This algorithm is used for day to day charging. It uses 100% of available solar
power to recharge the battery and is equivalent to constant current. In this stage the battery
voltage has not yet reached constant voltage (Equalize or Boost), the charger operates in
constant current mode, delivering its maximum current to the batteries (MPPT Charging).
Temperature is a huge enemy of solar modules. As the environmental temperature
increases, the operating voltage (Vmp
) is reduced and limits the power generation of the solar
module. Despite the effectiveness of MPPT technology, the charging algorithm will
possibly
not have much to work with and therefore there is an inevitable decrease in
performance.
In this scenario, it would be preferred to have modules with higher nominal
voltage, so that
despite the drop in performance of the panel, the battery is still receiving
a current boost
because of the proportional drop in module voltage.
Limiting Effectiveness
The DCDC
MPPT charge controller has a 4-stage battery charging algorithm for a rapid,
efficient, and safe battery charging. They include: Bulk Charge, Boost Charge, Float Charge, and
Equalization.
Four Charging Stages
Battery
Voltage
Equalize
Boost
Float
Recharge
Bulk Charge
A B C
Constant charging
Cumulative Time:3h
Float Charge
Boost
Time
Battery
Current
Time
Bulk
Max Current
Duration Time:2h
(Range:10-180min)
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