I need to leave my Prius in long term storage. Minimum 6 weeks at a time more like 2-3 months. No power outlet available to hook up any kind of maintainer or transformer. Does anyone know of a high voltage low amperage solar panel that I could connect to the Hybrid Battery to keep it from discharging and keep it healthy? Im guessing I need at least 300 volts and about 0.5 amp. Is this a feasible solution? I know I can get a solar battery maintainer for the 12v battery.