- Apr 16, 2021
The limitation is cost. Why over capitalise with multiple inverters when one will do? Why have extra inverters just to pass enough grid power through when one normal grid tied inverter can do the job anyway?Also these inverters have an inner bypass (AC in to AC out). That can transfer 40-50A ... per phase.
If not enough you can parallel 6 of them.
So there is really no limitation in residential usage.
In our cities the grid is very reliable, so most are not that concerned with an expensive backup option. But grid tied solar - the financial benefit is a no brainer in our market. That's why nearly 30% of homes have one.
Where I am though we get fairly regular outages, hence building my off-grid system which can supply power to our 3 buildings via a transfer switch when needed.
If I really want I could leave the transfer switch in the backup position and the off-grid system can operate in utility pass through mode with UPS cut over if the grid supply is cut. Meanwhile non-critical loads are not supplied via the backup, and if the grid comes back they will too, including the grid tied inverter.
Yes it's an often misunderstood concept.the most common question that comes up weekly is "I have a solar system and still sitting in the dark in a blackout ... what can I do against it"
I have no illusions that my grid tied inverter will go off-line when the grid does. But rather than spend $15,000 to have a grid tied battery system with grid isolation and backup capability which will never payback in my lifetime, I built an off-grid system to provide backup for a fraction of the cost. As a bonus I've taken some load off-grid (pool pump) to use the otherwise spare PV capacity.