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10 panels £1000, 5kw battery another £1000, inverter and other bits and bobs worst case scenario another £1000 The rest of the money is installation. A south facing 4.5 KW system (10x450W what a good panel should output) will make 25 KW on a good day and 2.5 on a shity one, and anything in between on the rest. Yours is not south, will probably make 15-17kw on a good day.