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most solar systems will not operate in a power cut.
edit: system detects no grid supply and shuts itself down. other systems with an off-grid mode exist, just theyre not the default and usually cheapest option a lot of people round here install.
You ask for level 3 backup
Level 3 means the panels provide power in a blackout; panels charge the battery with excess generation, battery provides power at night
But they very easily can if you design your system to
You turn off your main breaker which would stop the solar generated power from flowing out. What power you do have wouldn't be super stable, but at last you could run a few chargers, small appliances, etc.
One thing I've thought of is going to my local recycling center where they take in used/old car batteries. You could look up how to wire a handful together and use solar to charge them for evening use. Wouldn't result in much, but a lot of those places recondition them and they're $20-30/each.
If you have a generator, I've heard you could wire a thick extension cord with 2 male ends and just run power to a wall outlet. The power will flow through one breaker to the rest, but extra care needs to be taken to not overwhelm any one circuit on the generator or house. This would be a last resort for bare essentials like fridge, sump pump, etc.
I feel like battery in this case was more of a whole house battery. That would work in an outage. Unsure if it could still be charged in an outage.