Yangtze 12v 24v 20A Solar Charge Controller adopts the most advanced digital technique and operates fully automatically. The Pulse Width Modulation (PWM) battery charging can greatly increase the lifetime of battery. It is  ideal for small solar system especially home system 12v 24v 20A Solar Charge Controller Features：·High efficient Series PWM charging,Website: , increase battery lifetime and improve solar system performance·Use MOSFET as electronic switch, without any mechanical switch ·Intuitive LED indicators showing battery voltage status·Gel, Sealed, and Flooded battery type optional·Manual control the output of the load·Temperature compensation, correct charging and discharging parameters automatically·Humanized  Key, more comfortable and convenient ·Industrial grade design12v 24v 20A Solar Charge Controller Electronic Protections:·Load overload protection·Load short circuit protection·Battery over discharge protection ·Battery over charge protection ·Battery reverse polarity protection◆YSC-S (5A-20A) Charger Controller (Single/Double Road Output)ModelYSC-15SYSC-20SRated  Voltage 12V/24V AutoStrong Charge Voltage 14.8V/29.6VEquilibrium Charge Voltage14.5V/29VFloating Charge Voltage 13.7V/27.4VUnder Voltage Protection10.8V/21.6VUnder Recover Voltage 13.0V/26.0VNon-load Current ≤6mACharge Circuit Voltage Drop ≤0.7VDischarge Circuit Voltage Drop  ≤0.3VMaximum Charge Current 15A20AMaximum Load Current15A20AController Protection Over-charge , Over-discharge , Over-current , Short circuit ,Reversed PolarityCharge ModePWM Charging Mode Operating Temperature -40℃~+60℃Protection Level IP56Using Altitude ≤5500 meters Size 136 x 92 x 31mm