Hi there Pat
That’s a really good question, do you need it? Almost certainly not. When I started in solar in 2010, the normal system size was 1.5kW, then soon after 3kW was the standard, but now 6kW+ of panels seems to be the minimum quoted. Reason being is that panels are so cheap these days and the largest expense is in the installation, which means it’s not usually a significant amount more to get a larger system. Maybe it’s a case of keeping up with the Joneses as well. In my humble opinion Pat, just get what you need. 3kW will serve you very well.
I continue to be shocked by how cheap quotes are these days, so is our solar price calculator. CTS seems to get good reviews. I’d be happy with Fronius and Canadian on my roof, but I agree with you, ask for a smaller system.
Hope that helps.
Marty