You are not allowed to have own PV and big capacity storage without connection to electric grid?
Not in Poland, because you are too independent.
"According to the adopted act, devices with a capacity of up to 30 kWh are exempt from any construction procedures; only reporting to the grid operator (OSD) is mandatory. Those between 30 kWh and 300 kWh in a building and 30 kWh and 2000 kWh freestanding are obliged to prepare a land development plan and make fire safety arrangements."
https://renewablesnow.com/news/poland-adopts-rules-to-ease-e...