Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 21,900
If whoever we are talking about has the wrong size transformers for the inverters then I don't know why we're having this discussion.
European/rest of world growatt inverters and transformers have no place in the split phase world, it's inherently too dangerous to make work properly.
Yes but ... Growatt now sells a "US" model 240V 60Hz inverter with N-G bonding screw removed, and an auto-transformer.
Not sure exactly what their UL listing says, but it isn't clear what wattage inverter the auto-transformer is supposed to be used with, or how to protect it.
SolarEdge and SMA also sell 240V inverters with separate auto-transformers. SMA used to sell a different auto-transformer to get 120/240V split-phase from 120V inverter. The SMA ones were packaged with transfer switch so auto-transformer was never paralleled with grid, and it was big enough for the inverter.
I suspect some UL Listings are more equal than others.