Thank you for selecting the ViewStar AU series common positive solar charge controller. The VS-AU controller is a PWM charge controller with built in LCD display that adopts the most advanced digital technique. The multiple load control modes enable it can be widely used on solar home system, traffic signal, solar street light, solar garden lamp,etc. Controller can work continuously at full load within the environment temperature range from -25 to 55 ℃3-Stage intelligent PWM charging：Bulk, Boost/Equalize, FloatSupport 3 charging options: Sealed, Gel, and FloodedLCD display design, dynamically displaying device’s operating data and working conditionDouble USB design, the power supply charge for electronic equipmentWith humanized button settings, operation will be more comfortable and convenientMultiple load control modesEnergy statistics functionExtensive Electronic protectionBattery temperature compensation function The controller connection sequence is Battery--Load--Solar Panel, and discounect the system in the reverse order Solar Panel--Load--BatteryConnect components to the charge controller in the sequence as shown above and pay much attention to the “+” and “-”. Please don’t insert the fuse or turn on the breaker during the installation. When disconnecting the system, the order will be reserved.After power on the controller, check the LCD on. Always connect the battery first, in order to allow the controller to recognize the system voltage Accumulative power zero clearing: Under PV power interface, press SET button and hold on 5s then the value blink, press SET button again to clear the value.Setting temperature unit: Under battery temperature interface, press SET button and hold on 5s to switch. 4548AU KW1220 T30 P40 ST6-30A WP3024D Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.4 out of 5 stars 38 4.5 out of 5 stars 7 3.8 out of 5 stars 10 5.0 out of 5 stars 4 3.7 out of 5 stars 8 3.7 out of 5 stars 30 Price $68.86$68.86 $20.98$20.98 $89.98$89.98 $174.59$174.59 $61.59$61.59 $53.53$53.53 Nominal system voltage 12/24VDC Auto 12/24VDC Auto 12/24VDC Auto 12/24VDC Auto 12/24VDC Auto 12/24VDC Auto Max. PV open circuit voltage 96V 96V 100V Battery type Sealed(Default) / Gel / Flooded OPEN,AGM,GEL Sealed / Gel / Flooded Lead-acid battery, Lithium battery Charging Method PWM PWM MPPT+PWM MPPT PWM PWM