See attached link. As new. Shipped from UK. A very simple to wire B2B charger for your RV or Boat. Charges ANY battery bank from start batt/alternator and then auto switches to MPPT solar controler with same profile. Lithium, AGM, Custom settings etc. Built in temp cut offs for Lifepo4 banks, etc. Solar controller can be turned off if not required. . Would cost you a fortune to buy this now around 650$ with shipping etc. See this article: https://marinehowto.com/understanding-the-sterling-power-pro-batt-ultra-battery-to-battery-charger/ Near VGH hospital.