Battery packs; Batteries and battery chargers; Photovoltaic systems that convert sunlight into electric and thermal energy; Programmable controllers and actuators that track the sun enabling concentrating optics to maximize solar energy input; Photovoltaic inverters; Solar-powered rechargeable batteries; Touch screen pens; Solar-powered battery chargers; Electric control devices for energy management; Wireless controllers to remotely monitor and control the function and status of other electr...