"PR 1010, PR1515, PR2020 PR3030 The Fangpusun PR 10-30 series of  charge controllers is the highlight in the range.  The lates charging technologies,  combined with a Fangpusun AtonIC state of charge determination which has been  significantly improved once again, result in optimal battery maintenance and  control of the module output of up to 900 Wp which can be connected to it.  A large display informs the user  about all operating modes with the aid of symbols. The state of charge is  represented visually in the form of a tank display. Data such as voltage,  current and state of charge can also be displayed digitally as figures on the  display. In addition, the controller has an energy meter which can be reset by  the user. " www.fangpusun.com