Maybe ask around your neighbours or google for a reputable local sparkie and talk to them about the drama's you're running into rather than going through a 'solar installer'. They are only really interested in the cookie cutter installs where they can be in and out quick and easy, take your cash and onto the next job.We can definitely get enough sun on the roof, especially in the afternoon. In summer, we're good from late morning until late arvo. There won't be much in winter, but we know that. We get pretty much all day sun on the driveway and were going get a specially designed car port strong enough to hold the panels, but we're holding back now as we can't get anyone willing to do the job. I even called up solar victoria to complain, and they can only say they can't force any installer to do the job.
I just don't understand why no one wants to do it. They all just back out after they say we will come back to you with a quote. I can't believe they don't want our business.
Also, optimisers or micro-inverters 'might' be worth considering if you are going to have panels facing all different directions and partial shading over different parts of the array during the course of the day.
Good explanation here: