It's awesome that you're thinking about your future early - a lot of our peers don't!

You can request from you solar contractor to have a grid-tied solar only system installed that is prepped (plug & play) for future battery implementation.

With 20% down you should absolutely be able to find a 30 year fixed rate....although, I don't know your financial/credit situation...but getting a 30 year fixed rate, especially early on, will help you qualify for more deals in the future. 

I built a spreadsheet that calculates payments (excel PMT function) for a range of interest rates and terms and then a second spreadsheet to calculate the balloon after 10 years (excel FV - future value) function. 

I send the sellers letters to fish for future deals and I send the buyers letters to help build my buyers list.Of course those wholesalers that are assigning their deals won't show up in public record.

Looking to expand to the Connecticut market in the future.

I'm also hoping to try out the BRRRR strategy in some of my future deals.My main goal is to connect with as many members on BP as I can and help others in their endeavours while learning about real estate investment myself.

Columbus looks promising and has had decent growth and has a good future growth potential.

They often lend based on the future value rather than (just) your purchase price. 

The big caveat is that you must be certain that the future value is commensurate with what you can likely finance the park for.