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問題 · 2026-05-29
英國家居太陽能回本期一般為6至15年，具體時間取決於安裝成本、日照條件、用電習慣及是否配備電池。
英國家居太陽能系統的回本期一般落在6至15年之間。不安裝電池的系統因初期投資較低，回本期通常較短，約6至8年；安裝電池的系統因成本增加（約3,000至6,000英鎊），回本期通常延長至10至12年。
實際回本時間受多個關鍵因素影響：安裝成本、屋頂朝向與日照充足度、家庭用電量、白天自用比例、電價水平，以及是否透過智慧出口補償（SEG）將多餘電力賣回電網。地理位置也很重要——英格蘭南部日照較充足，回本通常更快。若家庭擁有電動車或熱泵等高耗電設備，白天自用率提高，回本期可接近下限（約6至8年）。
英國目前對住宅太陽能安裝實施0%增值稅優惠，有助降低初期成本。由於太陽能板壽命通常超過25年，回本後住戶仍可享有超過10年的免費電力。
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