Inverter faulty

Guys do not buy from this company. I bought a 6.2kva ecco inverter and a 51v ecco battery combo from these guys. The inverter failed....couldnt pick the solar input when we took it back the guys refused to get it back or even look at it coz they say they need an Certificate of installation. Imagine having bought this and taking it to your rural home...and install it coz its nothing complicated. Just 6 solar panels in series. Right now the inverter is at home coz they refused to take it back. I will say do not buy from this company. I had to look for an alternative inverter.