Well, I am an electrical engineer that builds batteries for electric vehicles.  

There is the added risk of transporting the module to the site.

I also have a lockbox that I would give guest access to in case the battery goes out in the smartlock or if they find a creative way to lock themselves out of the house with the deadbolt locked.

I have been in a bit of a rut since I lost one of my previous deals and reading your story helped to recharge my batteries. 

I'm sure battery backups would help with that at night. 

I mostly blame my naiveness in humanity and eagerness to get the project going.. here are many of the items (not all):All 3 HVAC units went out in the first 3 monthsBoth "high end" endless water heaters died within 6 monthsThe 1918  LEAD pipe entering the home burstSome lighting was found to be battery operated instead of electricUnfortunately a rock from DC water entered the piping which resulted in multiple cancelations and major repairsNo insulation between the upper and lower unit resulting in numerous noise complaintsPitch incorrect in back yard which results in floodingPlumbing piping incorrectly sized throughout homeAll gas lines removed and everything replaced with electric to pass city inspection easier (only house on the st without gas)Oh yeah, furnishing a two units that can sleep a total of 16 people is not easy nor cheap (especially with a puppy).

All the good ones have a robust accounting module as part of the platform, so you'll be good to go. 

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.

Drug dealing 4 times , assault and battery 2 times , domestic violence 4 times , IRS lien over 10K ,  failure to pay child support 10 times , and only 1 Failure to pay rent .  

I mean I had not heard about it as a viable market and I have a pretty good idea of most of the viable markets in the country.. so right there I am thinking wow.then I had done a ton of deals in the deep south and the same homes that were worth 20 to 50k in Memphis were selling for 200k in Charleston same house same condition.. and none cash flowed.. so I knew right there that these were basically all being sold to owner occs and that's where the real money is made in the flipping business unless your going to be a high volume turn key company.So then I am following Boeing pretty strongly being a private pilot.. and I understood they had battery problems with the 787 but they got those worked out..