SOLAR - BEWARE of Nengstar and Growatt

This company did a Solar panel, Growatt inverter installation for me, which I paid good money for. Within a year it is not working. The techs they sent out had no idea what to do. Arranged to meet the owner on site at 2pm today - never arrived, never even notified me he is not arriving. This has been going on for a while. Be aware before using their services - They are all over the web and are very misleading