PV during power outage

[SunEagle]

The system installer provided us with the info that a battery backup is not allowed in our neighborhood. I did not consider batteries for various reasons. I asked anyway.
I see various restrictions from NYC and FDNY related to indoor vs. outdoor installation requiring minimum distance from structures. I am not referring to e-Bike fires in apartment buildings.
In our street houses do not have enough distance to the next house/fence/structure.

As to EV versus stationary battery:
If the vehicle is parked inside a structure (attached garage or the garage is part of the house), I see no difference in installing stationary batteries. I can not imagine that FDNY is moving a vehicle on fire.

I do not know the electrical details of the PV system that feed the grid. I agree that only these need to match: Voltage, frequency, and phase.
I consider the grid low impedance and clamping voltage system - with constant frequency and constant voltage.
The PV system can only feed current into the grid if its voltage is slightly higher at the same phase and frequency.
In theory, the PV system could function if a simple pure sine wave on the phases is sensed. It may not destroy that AC power source simulating a power grid but regulate its output power (better voltage) because the "grid" voltage would go up. Since the grid is supposed to be a constant voltage source, a control unit must prevent overvoltage.

I have no intention to test this.

I am glad you are not going to test a bypass of the grid. Others have tried just to see the equipment fail so unless you have money to burn I would not try out a test.

What I would do is work with your local FD and code enforcers to change the rule they have about fixed batteries. I would also work with the inverter supplier to find out what parameters it is looking for in the Grid to make it work. Some inverter companies seem to build in hardware/software that allows a small percentage of the inverter to work off line should the grid go down. Maybe your inverter company has that "bypass" equipment that can be added or swapped. Just remember that unless the sun is really consistant that "bypass" will stop working if the panels are blocked by clouds, snow or shadows of any kind.

[solardreamer]

I do not know the electrical details of the PV system that feed the grid. I agree that only these need to match: Voltage, frequency, and phase.
I consider the grid low impedance and clamping voltage system - with constant frequency and constant voltage.
The PV system can only feed current into the grid if its voltage is slightly higher at the same phase and frequency.
In theory, the PV system could function if a simple pure sine wave on the phases is sensed. It may not destroy that AC power source simulating a power grid but regulate its output power (better voltage) because the "grid" voltage would go up. Since the grid is supposed to be a constant voltage source, a control unit must prevent overvoltage.

I have no intention to test this.

Good, because it won't work at all as you imagined. Much more to it than just matching voltage, frequency and phase.