Is it possible to upgrade battery and or add additional panel if required. Would like the light to be on from dusk till dawn . In the winter months when it gets dark at 5:00/5:30 pm and sunrise is at 6:00/ 6:30am we would be at 13-hours plus. Also concerned about the cloudy days that it is not as sunny so would like to have some stored. My target price is between the the cost above and $675/700 If there is a better package in the price range. Please advise. Thank you .