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Feature: *Advanced Maximum Power Point Tracking (MPPT) technology, with efficiency no less than 99.5%. *High quality components, perfecting system performance, with maximum conversion efficiency of 98%. *LED shows if solar panels and battery are really connected to the controller. *Ultra-fast tracking speed and guaranteed tracking efficiency. *Wide MPP operating voltage range. ALWAYS CONNECT INVERTER FIRST,FINALLY THE LOAD! THE DISASSEMBLY SEQUENCE IS CONTRARY TO THE WIRING ORDER. specifications Maximum power current and discharge current:40A Peak power of solar cell panel( Max Wp):520W(12V),1040W(24V) Solar panels maximum open circuit voltage (V):≤96V Battery float voltage:13.8V(12V system)/27.6V(24V system) Battery (under voltage) protection:10.6V(12V system)/21.2V(24V system) Battery (under voltage) recovery voltage:12.6V(12V system)/25.2V(24V system) System load loss:≤13mA Temperature compensation: -4mV/Cell/℃ Loop Buck: ≤100mV Operating Temperature: -10℃~60℃ Storage Temperature: -30℃~70℃ Humidity requirements: ≤90%, No condensation Maximum open circuit voltage of the solar panel:18V-24V(12V system)36V-48V(24V system) Installation Lin(mm2):8mm2 Installation Line(AWG):10(AWG) Weight:1.3kg Battery capacity configuration:≥300AH Dimensions:195*195*80(mm) Package Including: 1X40A mppt solar charge controller 1XEnglish Manual