PowerTech MP3768 User Manual

7
GENERAL INFORMATION:
MAXIMUM POWER POINT TRACKING TECHNOLOGY
Due to the nonlinear characteristics of the solar array, there is a maximum
energy output point (Max Power Point) on its curve. Traditional controllers,
equipped with switch charging technology and PWM charging technology,
can't charge the battery at the maximum power point and cannot obtain the
maximum energy available from the PV array. In contrast, the solar charge
controller with Maximum Power Point Tracking (MPPT) Technology can lock
the point to obtain the maximum energy and deliver it to the battery.
The MPPT algorithm continuously compares and adjusts the operating
points to locate the array's maximum power point. The tracking process is
fully automatic and does not need the user's adjustment.
As Figure 1-2, the curve is also the array's characteristic curve; the MPPT
technology will 'boost' the battery charge current through tracking the MPP.
Assuming 100% conversion eciency exist in the solar system, the following
formula is established:
Input power (PPV) = Output power (PBat)
Input voltage (VMpp) x Input current (IPV) =
Battery voltage (VBat) x battery current (IBat)
Normally, the VMpp is always higher than VBat. Due to the principle of energy
conservation, the IBat is always higher than IPV. The greater the dierence
between VMpp & VBat, the greater the dierence between IPV & IBat. The
greater the dierence between the array and the battery will also decrease
the system conversion eciency. Therefore, the controller's conversion
eciency is particularly important in the PV system.
Figure 1-2 is the maximum power point curve, whose shaded area is the
traditional solar charge controller (PWM Charging Mode). It is known that
the MPPT mode can improve solar PV usage.

PowerTech MP3768 Specifications

General

Brand	PowerTech
Model	MP3768
Category	Controller
Language	English