Converter charging module power supply from 7-35V to 1.25-30V Adjustable - 3A Applications Battery charger (including ferroelectric), 4V, 6V battery charger, 12V, 14V, 24V nickel-cadmium nickel-metal hydride battery charger (battery), solar panels, wind generators. Solar panel, wind generator voltage regulator, car power supply.   Technical specifications Input voltage: 7-35 V. Output voltage: 1.25-30 V.  Output current: max 3A (if higher than 15W, please install the heatsink which is not included in the article) Constant current range: 0-3A (adjustable) Minimum voltage pressure: 2V  Output power: 15W natural cooling, 25W with heat sink Conversion efficiency: 85% (the higher the output voltage, the higher the efficiency) Operating temperature: industrial (-40° C to + 85° C) (if the ambient temperature exceeds 40° C, reduce power consumption or improve dissipation heat) Temperature rise at full load: 45 °C No-load current: typical 10mA (12V to 4.2V)  Load setting: ± 1% Voltage regulation: ± 0.5% Current Accurac and temperature: Actual Testing, changes of temperature from 20 degrees to 100 degrees, constant current value variation Less than 1% (constant current value 1A) Response speed dynamic: 5% 200uS Direction of adjustment of the potentiometer: clockwise (increase), anticlockwise (decrease)  LED indicator: red charging LED, green charging full LED Output short circuit protection: YES Input reverse polarity protection: YES Corruption prevention Outgoing body: YES    Method of use 1.Check the charging voltage of the charging battery and the charging current, the input voltage of the module 2. adjust the constant voltage regulator, the output voltage about 3V 3. With a multimeter (at 10A) measure the output short-circuit current, also adjust the constant regulator that allows the output current to obtain a predetermined charge current value 4. Adjusting the constant regulator allows the output voltage to get the floating voltage 5. Connect the battery and try to charge NB (In the first 4 steps connect the power but not the battery, connect it in the fifth step)