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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.
To give you an idea of what a plain solar installation with line inverters and no additional expenses looks like, a 6kW solar system could cost approximately $25,000. If your utility company offers rebates ($2.00 per watt, for example), that amount would be deducted: $25,000 â $12,000 = $13,000.or example, if you owe the IRS $5,000 in taxes and your solar system costs $14,000 (after rebates and incentives), your tax credit of $4,200 would reduce your tax liability to $800. Please contact your accountant for advice in your situation. Form 5695 for Year 2012.