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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.
So what is the current cost of residential solar power? As of early 2015, itâs approximately $3.00 per installed watt. The average sized solar panel system is 5,000 watts, so this brings the total cost to $15,000. That 15k figure is just an average amount.Systems can cost more or less mostly depending upon a homeownerâs energy usage. That $3.00 per watt is, if anything, on the very low side. Pricing can vary due to specific brand of panels used, inverter brand, and regional pricing differences.hat 15k figure is just an average amount. Systems can cost more or less mostly depending upon a homeownerâs energy usage. That $3.00 per watt is, if anything, on the very low side. Pricing can vary due to specific brand of panels used, inverter brand, and regional pricing differences.