First of all, the body corporate may need a gentle education.
Solar isn't going to "overload" the supply, what you're doing is installing a system that in many cases will unload the existing infrastructure. On top of that, if you do have issues with voltage rise because everyone in the complex installs solar, modern systems can be throttled to prevent excessive generation, which in turn can be soaked up by batteries or electric cars.
This article explains the electrical concepts well enough :
https://www.solarquotes.com.au/blog/shed-solar-distance/
One problem with strata titled, body corporate, common roof and undercroft parking type places is that sometimes the electricity metering is in one location and the consumers are spread across another parts of the building or property. For example it can be impossible to connect a sub circuit from a third story apartment to a basement car park. These location problems are shared by car charging and solar generation technologies but they're not insurmountable.
These links will explain how to build one big efficient, cheap, body corporate solar system that distributes energy and savings to the dwelling owners :
https://www.solarquotes.com.au/blog/solshare-victoria-award-mb2249/
https://allumeenergy.com/au/how-it-works/
https://www.solarquotes.com.au/blog/solar-for-strata/
Network requirements
On top of that there could also be a requirement from the local DNSP (the poles and wires people) to have what they call DRM control. This is a fairly new space but for instance, SAPN have run a trial that will be introduced grid wide in 2023 where they are able to take control of your solar in limited circumstances.
It means on those stinking hot afternoons when everyone's air conditioning is hammering the network you can have greater than normal capacity to export, whereas on low demand days they will curtail your solar so it doesn't impact the wider grid..
In the future car chargers will be bi-directional, like household batteries already are, so you can actually pick up energy for cheap around midday, then siphon it off to lower your bill when the grid is stressed and prices are excessive in the evening.
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