Hi Albert,
All this stuff is reasonably new to me with inverters and what-not,
however, I do know power distrbution systems well.
From a personal point of view, I would never reverse-feed any transformer, sure, distribution transformers
you "may" get away with, but you need to realise that the transformer will need to be de-rated,
by a certain factor, I can't off-hand tell you what that is, as they are all application-specific.
It could something as low as 65% or as high as 85%, this de-rating factor needs to be taken into account.
If it were me doing this job, I would wait and get the correct unit for the job.
I don't want to come across as some sort of an (expletive), but all of this should have been worked out
in the original planning stages to procure the right equipment, before the job even started.
I see this time and time again over here, involve so-called "engineers" that couldn't plan their way out of
a wet paper bag.
