Midnite's Classic 150-SL is a simplified solar only version of the Classic 150 with streamlined menus making it extremely easy to set up and use. The Classic 150-SL includes a graphics panel, HyperVOC and built-in ground fault protection. However the 150-SL does not include arc fault or Ethernet capabilities. If you require ethernet connectivity or if your local inspector requires arc fault protection we recommend the original Classic MPPT charge controllers.