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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.
However, by the end of 2014, residential rooftop PV system installed prices averaged $3.48 per watt, down from $3.83 cents per watt in the first three months of 2014.This represents the largest absolute decline across any of the market segments.riven by significant reductions in balance-of-system costs, the cost for a medium-scale commercial system averaged $2.25 per watt by the end of 2014. This is down from $2.53 per watt in the first quarter of 2014.