(Maximum Power Point Tracking). The advanced tracking algorithm make the solar module operate at ideal voltage which the solar modules can produce the maximum available power. Compared to conventional PWM controller, MPPT technology increase charge efficiency up to 25% and decrease the power of solar array needed. 12VDC / 24VDC Auto Rated Battery Current 30A Max. Solar Input Voltage 100VDC Max. PV input power:12V/ 390W , 24V /780W Dimension 228x 164 x 55 / mm Weight 1.2kg