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?
I think 50A / phase bypass is more than enough for residential use.
That is 150A for this 3 phase unit. I do not think you use 33kW in any given time in a home
Also this is only limits the protected load side. The green unprotected load side you can have as much as your main can handle.
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.
Or you could build a hybrid system.
One other hybrid solution is the grid-tie + UPS solution. I am doing this myself. I have to because the EVE cells I can not put outside ... and the solar array is far from the house. Also the off-grid inverter is an 5048MK and that is a double conversion Online UPS (own clear sinus wave)
As you can see here on the exactly same spots the green unprotected load connects, and the purple protected load connects.
The only difference is that the grid-tie is a separate unit. This system has cons and pros against the one unit hybrid.
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.
Even more the MPP Solar inverters not only do bypass ... they doing it with power production on that line.
Have inner limiter. So power comes in into the inverter from grid, PV power comes in ... and out goes to the house all the PV power and a little bit from the utility power.
Yes it's an often misunderstood concept.
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.
Why $15.000 battery?
These one unit Hybrid inverters use the same 48V battery.
You buy 16 cells of EVE/Lishen/CATL and you have your battery for it.
Like $3000 for 16pcs of 280-300Ah cells with BMS.
The inverter is not cheap but compared to Sol-Ark it is
A one phase 5kW inverter is $1400
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A 3 phase 10kW inverter is $2390
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And you connect your EVE cells to it and your Solar panels and the main and protected load panel ... and your system is ready.
(of course you will need the contract with the grid utility company ... but it is
exactly like with a grid-tie inverter ... since it is a grid-tie inverter for them)