How much do photovoltaics cost?
A. An automatic, stand-alone, dusk to dawn, 18 watt low-pressure sodium street lamp, with three days of battery storage, currently costs about $3,000 as a packaged system (installation not included). Utility-connected systems typically cost between $6,000 to $12,000 per kilowatt of installed PV. The exact cost is dependent on how the system will be mounted and the volume of the purchase.
