@Jack Cottrell You Vacancy & Maintenance percentage are aggressive and may only work for a Class A rental/tenant.If the is a Class B or C rental that will attract Class B or C tenants, you should strongly consider increasing those percentages.NOTE: we deal with a LOT of Class B & C rentals, so we replace "Vacancy" with "Vacancy/Tenant Nonperformance".

Quote from @Kevin Robert Highgate: The ability to invest in property and replace your W2 income quickly is tough.

The solar system adds no value to my property for rental purposes, and I may even be ripping up the roof & replacing it in the new year.Beyond sending a nasty letter through my attorney via certified mail, demanding the company come pick up their equipment, am I required to take any further action or fulfill any obligations regarding these contracts?

I have now replaced my old corporate job income and expect to make over $70k cashflow off of my 31 unit portfolio while also having the time I want to be able to enjoy sailing, camping, hiking, and hunting.

And, if you were able to generate $500/mo cash flow as Scott suggests, his method would not replace your income: if you could do only 3 properties a year that would net $1500/mo cash flow and it would take you 10 years to scale it to $15000/mo.

It's important to remember that all the analytics in the world cannot replace the human touch.

Your renters will destroy these items and want you to replace them. 

My current tenant has removed a picture from the wall and replaced the provided bedding with their own belongings. 

•Systems: Servicing the HVAC system, replacing the water heater, and updating the electrical panel.The renovation was completed in 13 weeks and totaled approximately $35,600.

Fixing a leaky toilet, replacing a broken light fixture, etc. can create good will.