When you invest you have to also weigh the risks. Investing in a cheap inverter means higher failure rates and replacement cost.
If you DIY like I am ATM, you just buy a spare when you see a special on aliexpress for US$299 4kW (offgrid backup), but for most ppl that is out of the question.
Back then in 2009 or when it was, I just got the SMA. With 60c rebate up to 2016 the system paid itself back more than twice.
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