I am thinking about selling my SPX EVSE. What is a used SPX Power Xpress worth? It has the latest firmware, works with the RAV4 EV and 2011 LEAF with end timer. The J1772 cable crimps have been soldered and the cable has been tested at 32 amps with no connector overheating. The input connector is a 14-50, cable is 8 awg.