Manual

17
Solar Charge Algorithm
The DCDC will lower the output power when its internal temperature is in the range from
65℃ to 80℃. It will stop charging when the temperature is higher than 80℃, and recover
to charge when the temperature is lower than 60℃.
4.1
a. DCDC30: 15A from alternator, up to 15A from solar for a total of up to 30A.
If the service battery type is set to lithium, the DCDC will stop charging the service
battery when its temperature is lower than 1℃, and recover to charge when it’s higher
than 3℃.
4.3
If the service battery type is set to lead-acid, the DCDC will stop charging the service
battery when its temperature is lower than -36℃, and recover to charge when it’s higher
than -34℃.
4.2
Operating Temperature4.
The DCDC utilizes Maximum Power Point Tracking technology to extract maximum power
from the solar module(s). The tracking algorithm is fully automatic and does not require user
adjustment. MPPT technology will track the array's maximum power point voltage (Vmp) as it
varies with weather conditions, ensuring that the maximum power is harvested from the array
throughout the course of the day.
In many cases, the MPPT charger will "boost" up the current in the solar system. The current
does not come out of thin air. Instead, the power generated in the solar panels is the same
power that is transmitted into the battery bank. Power is the product of Voltage (V) x Amperage
(A). Therefore, assuming 100% efficiency:
Power In = Power Out
Volts In • Amps In = Volts out• Amps out
Although MPPT chargers are not 100% efficient, they are very close at about 92-95% efficient.
Therefore, when the user has a solar system whose Vmp is greater than the battery bank
voltage, then that potential difference is proportional to the current boost. The voltage
generated at the solar module needs to be stepped down to a rate that could charge the battery
in a stable fashion by which the amperage is boosted accordingly to the drop. It is entirely
possible to have a solar module generate 8 amps going into the charger and likewise have the
charger send 10 amps to the battery bank. This is the essence of the MPPT chargers and their
advantage over traditional chargers. In traditional chargers, that stepped down voltage amount
is wasted because the charger algorithm can only dissipate it as heat. The following
demonstrates a graphical point regarding the output of MPPT technology.
MPPT Technology
Current Boost
b. DCDC50: 25A from alternator, up to 25A from solar for a total of up to 50A.