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Although there is no average size commercial solar system, prices start from Â£4000 + VAT for a 4kW setup made up of 16 panels & grid connection. Adding a Tesla battery storage system will store excess energy during the day when grid costs are higher, for use on-demand later in the day or night.
The cost of a solar electric system is measured in dollars per watt. The average cost for a residential system is currently $3-5 per watt. That means the average 5-kW residential system will cost $15,000-$25,000, prior to tax credits or incentives. A one-time âResidential Renewable Energyâ federal investment tax credit (ITC) is available for residential solar PV systems.