Largest kW domestic allowed

To chime in on this, it is entirely possible that you drop the application fee and that your application is refused. However, there was a real willingness from ESBN to 'make it work' as best they can.

You can mitigate the risk by examining a few aspects yourself to determine the "strength" of your current connection and doing a much more approximate quick desk study.

One important thing to consider in terms of my takeaways from the NC7 process:

Let's say you had a 12 kVA connection and you wanted to connect the maximum amount possible (in this case 12kW of inverters as your MIC will set the upper bound here). Your application is more likely to be successful with 4x 3 kW inverters than 2x 6 kW inverters as harmonic emissions from multiple inverters can be out of sync and cancel each other out (good), whereas fewer larger inverters experience this to a lesser degree. IE more small inverters are better than fewer large inverters for an NC7 application.