Wanting to start house solar - wall mount as first phase question
I live in Erie PA and have been noodling on a DIY solar project. In the end I want to roof mount solar for my home but i'm not quite to the point of replacing my roof yet (it for sure needs done first), but I was noodling on if getting started makes sense with my South facing wall as shown in my image. It gets unobstructed sun until mid afternoon when the sun moves to the west more. Doing some eyeball measurements I was estimating I could get at least 10-12 panels on this space, but I had a couple questions.
I was hoping this was a good chance to get the first permits and electrical setup with the intent to expand this system, The power meter / circuits are not super close but are on the other side of the sun room on the right of the picture. Is doing a chunk on the wall a OK idea then add on later?
I hadn't done a full calculation yet, but my rough math had me needing around 18-20kWh - system. We have 1:1 net metering so I'm not looking at a battery at this time... I'm still working out if i can even put that much system on my house. This wall and the sunroom roof are the south facing surfaces with the main part of house having East and West roof space. I'm not sure how much 10-12 panels would get me, but it's probably not a bad start?
If doing in phases makes sense (rough idea would be the roof would be done in next 3-5 years) what are some things I need to consider now? Since my system would be all on the wall, I would guess it's more of getting the power tie in setup and plan on where the roof would come down when it's time, but I can't find too much on wall installs so I was hoping for some insights on the general plan... is it worth doing maybe 20% of this project now and get some use of the system?