Solar controllers, namely, electronic circuits that control the voltage and current provided from a photovoltaic panel to other connected devices ; Peak power trackers which control the flow of power from a photovoltaic panel, ensuring operation at the point of maximum efficiency ; Electronic instrumentation related to solar power and wind power systems ; Electronic power conversion products, namely, DC to DC power supplies ; Electronics to monitor and control batteries and battery packs ; Battery pack, namely, module primarily comprising battery, battery management system for monitoring and managing the condition of the battery pack comprising circuits, safety sensors for detecting the operating condition of the battery pack, and apparatus to interrupt the current flow out of the battery pack ; Battery chargers, battery conditioners comprising electronic power supplies and electronic control and monitoring systems used to equalize cell voltages in batteries and maintain batteries at a full state of charge