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1.3 Optional Accessories
1) Remote Temperature Sensor (Model:RTS300R47K3.81A)
Acquisition of battery temperature for undertaking temperature compensation of
control parameters, the standard length of the cable is 3m (length can be
customized). The RTS300R47K3.81A connects to the port (④) on the controller.
NOTE: Unplug the RTS, the temperature of battery will be set to a fixed value 25º C.
2) USB to RS-485 converter cable (Model:CC-USB-RS485-150U-3.81)
USB To RS-485 converter cable is used to monitor each controller on the network
using Solar Station PC software. The length of cable is 1.5m. The cable connects to
the port (⑨) on the controller.
3) OTG cable (Model: OTG-12CM)
The USB To RS-485 converter cable and the OTG cable are used to view and
modify the working mode and the parameters using the APP software. The USB To
RS-485 converter cable connects to the port (⑨) on the controller.
1.4 Maximum Power Point Tracking Technology
Due to the nonlinear characteristics of solar array, there is a maximum energy
output point (Max Power Point) on its curve. Traditional controllers, with switch
charging technology and PWM charging technology, can‟t charge the battery at the
maximum power point, so can‟t harvest the maximum energy available from PV
array, but the solar charge controller with Maximum Power Point Tracking (MPPT)
Technology can lock on the point to harvest the maximum energy and deliver it to
the battery.
The MPPT algorithm of our company continuously compares and adjusts the
operating points to attempt to locate the maximum power point of the array. The
tracking process is fully automatic and does not need user adjustment.
As the Figure 1-2, the curve is also the characteristic curve of the array, the MPPT
technology will „boost‟ the battery charge current through tracking the MPP.
Assuming 100% conversion efficiency of the solar system, in that way, the following
formula is established:
Input power (P
)= Output power (P
)
PV
Bat
Input voltage (V
) *input current (I
) =Battery voltage (V
) *battery current (I
)
Mpp
PV
Bat
Bat
Normally, the V
is always higher than V
, Due to the principle of conservation of
Mpp
Bat
energy, the I
is always higher than I
. The greater the discrepancy between
Bat
PV
3
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