1db Mppt Lithium Ion MPPT vezérlő - 12V MPPT napelemes vezérlő 3 sorozatú Lithium Li-ion 18650 akkumulátortöltő modul
1pc Mppt Lithium Ion MPPT Controller - 12V MPPT Solar Panel Controller 3 Series Lithium Li-ion 18650 Battery Charging Module
Descriptions:
1. Output voltage: 2-4 series lithium battery or lithium iron phosphate battery (can be adjusted by external resistance).
Suitable for 2-4 series lithium battery or lithium iron phosphate battery
Lithium battery 4.2*2 string = 8.4V
Lithium battery 4.2V*3 string = 12.6V / 4.2V*4 string = 16.8V
Iron lithium battery 3.6V*3 string = 10.8V / 3.6V*4 string = 14.4V2. Solar cell maximum power point tracking (MPPT) is to ensure that the light intensity changes, the photovoltaic cells have been the maximum output power to take full advantage of solar energy. In general, it is necessary to use the switch mode DC-DC converter to achieve MPPT function, to maintain the output voltage and charge current product (output power) to maximize.3. CN3722 is the use of switching buck mode DC-DC conversion way to achieve the maximum power point tracking function of photovoltaic cells, the input voltage up to 25V, very suitable for input voltage and battery voltage difference between the relatively large applications.
Features: 
High-end technology MPPT solar maximum power tracking charge management chip, with trickle, constant current, constant voltage charging management.
    The use of imported high-frequency low-conduction resistance double MOS tube, high current diode, high efficiency flat high-power inductors, alloy current detection resistor.
    The large aluminum cooling fin at the bottom, ensure it keep stability working at the high current.
    High-speed and efficient way of charging, heat small, fast.
    Dual status indicator light, no battery when the red light flashes green light is always on, charging red light, full of self-stop while the green light.
Specifications:
Input voltage: 18V nominal solar panels (no load about 21V solar panels)
Output voltage:Output voltage: 2-4 series lithium battery or lithium iron phosphate battery (can be adjusted by external resistance)
Output current: maximum constant current 3A (Charge current > 2A, please add heat dissipation)
Wiring method: Welding plate
IN : input positive,      IN - : input negative (SOLAR)
BAT : battery positive,   BA-:  battery negative
Size:45* 31mm/1.92*1.22inch
Package Included:
1 x MPPT Solar Panel Controller
1005003162081638 - modules