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Can you tell us the Inverter size as it is this that will determine your output? If you cannot have a smart meter it might be hard to get paid for export (but not necessarily impossible – others will comment on this) Assuming you pay 25p/kwh currently and can live off solar output for 3000kwh of your annual usage (you will not in winter) then your potential annual saving is 3000 x £0.25 = £750pa – 11 year payback – if you a comfortable with this then go for it!!!