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it has been worth it for us….battery and panels. Buy electricity at cheap rate depending on your tariff. In the summer paid for export and that helps to build your energy credit up for the winter bills. It was a no brainer for us. Didn’t think about pay back time as likened it to investing in a new kitchen. One wouldn’t normally think about ROI when investing in a new bathroom and kitchen and both would have wear and tear over the years as would your battery.
Good luck