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@small
I had a quote of £8.6k for 5.46kW PV (14 x 390w) & 8.2kW battery (GivEnergy) or £5.3k without the battery.
Estimated production 5300kWh per year. (pinch of salt) 5300 x 0.28 = £1484.00
Assume 60% of the above is met, payback with battery would be circa 10 years, less if energy prices rise etc.