Good delivery time, however should manage inspections better

We ordered 56 of their 2.4kva battery backup units from energy spark a week ago. However upon arrival yesterday there were 2 units which needed to be sent back due to some issue with the inverters. We would have provided 5 stars however having to send back the units should have been avoided by all units being tested first before being shipped, Their support responded fast to our inquiry though and all units are now working and finally in place.