EPEVER MPPT Charge Controller 20A Solar Panel Charge Controller Mppt 100V PV Input Negative Grounded Solar Regulator 12V/24V Auto with LCD Display for Gel Sealed Flooded Lithium Battery MPPT Charge Controller: has advanced MPPT technology High tracking efficiency&gt; 99.5%. Peak conversion efficiency of 98%. Accurately recognizing and tracking of multiple power point Multi-function blackligh LCD displays system information intuitively, dynamically display all the operating datas and working condition. Added Features: Negative Ground and compatible with Lithium(LiFePO4) Battery Chargin Solar Charging Controller Support PC software and remote meter MT-50, be convenient for real-time data viewing and parameter setting. Battery temperature compensation function, real-time energy statistics function. User programmable for 4 battery types: Sealed, GEL, Flooded and Lithium battery. Multiple load control method: manual mode, light ON/OFF, light On+Timer and test mode: manual mode, light ON/OFF, light On+Timer and test mode (20 months warranty) Multiple load control modes: manual control, lighting ON / OFF, light On+Timer Advanced Maximum Power Point Tracking (MPPT) technology, with efficiency no less than 99.5% LCD display design, dynamically displaying tool&#039;s operating data and working condition Available for PC monitoring and external display realizing real-time data checking and parameters setting Charging Power and Current Limitation Function User programmable for battery types, load control etc. Accurately recognizing and tracking of multiple power point PV short circuit / PV reverse polarity /Battery over voltage Battery over discharge / Battery reverse polarity / Load overload protection 1<span class="a-text-bold">2V / 24V DC Auto</span> <span class="a-text-bold">Max.PV open circuit voltage:</span>1<span class="a-text-bold">00VDC  </span>(92V at  25 temperature) Battery voltage range: 9V~32V C Charging Power and Current Limitation Function User programmable for battery types, load control etc. The wire size is only for reference. If there is a long distance between the PV array and the controller or between the controller and the battery, larger wires can be used to reduce the voltage drop and improve performance. Via PC (Accessories neededRS485), software download website: EPever official website or look for in the manual Via phone APP (Accessories neededEbox-Wifi or Ebox-Blue) If you want buy MT50, please search: B01NCF5VWZ, RS485:  B00YCSLQTA,  TS-R: B00YCSLU96 MC4 solar connectors&#034; B07GGTLGHL &#034; or&#034; B07H4JSJPW &#034; Circuit Breaker (30A 40A 60A-250A):  B06WLHDWSC,  B06WD1BLGQ