Solar install as part of ECO4 grant

NedS

That's my understanding too - yes, I'll get some clipping at mid-day during the summer months on sunny days, but that is more than offset by the extra generation outside of that. If the quote is reasonable for the extra panels, I'll definitely go for it.

Any idea how I'd go about calculating the pay back period? I don't know how to tell a site like the JRC photovoltaic (PVGIS) that I have 4.35kWp but it's limited by a 3.6kW inverter. Any rules of thumb to help calculate the approx additional output from the two extra panels?

Alnat1

I suspect the system as a whole will save you more than the cost of a couple of extra panels in the first year. Surely that's how to think of it, not how much extra was saved by adding 2 more panels?