RioRand Smart Solar Charge Controller 12V/24V 20A RRLD2420C Powered by RioRand Advanced Technology Microcontroller digital accuracy,PWM control,Multistage charging technology,Load disconnection depending on LVD Automatic load reconnection,Temperature Compensation,Common positive grounding on one terminal integrated data logger(optional),Night light function,integrated selftest,Overcharge protection,Deep discharge protection,Reverse polarity production of module load and battery,Automatic electronic fuse,Short circuit protection of load and module,open circuit protection without battery,Reverse current protection at night,Overload protection,Battery overvoltage shutdowm Graphical LCD display,For operating parameter,fault message,selftest,Simple menu-driven operation,Programming by buttons,Manual load switch