If not, and it's a pure investment, I would go by property statements.

I have general lights but apparently, the emergency lights need to be connected to some sort of battery(I’m not an electrician) and piping in order for the lights to stay on in case of a power outage.

In this case, you really want your cash flow to be closer to $200/mo for a Single Family Home (SFH), and that should be pure cash flow (after your expenses, maintenance, vacancy, P.M. fees, etc).

I think this might have been hinted at in this thread but if you are going for a purely financial decision, and want to do STR, I would stick only with existing tourist vacation destination locations that have been that way for some time.  

HI IS THERE SUCH A THING AS A WIRELESS BATTERY OPERATED HALWWAY LIIGHT WITH A MOTION SENSOR, THAT IS BRIGHT ENOUGH TO BE ABLE TO SEE AT NIGHT ON STAIRCASE?   

I feel that someone shopping purely on price, also has a larger propensity to have other issues that may make them a less than ideal tenant.

If the lending party is not expecting any sort of capital or profit interest, then just bring them into the deal as the pure lenders.

Don’t go with battery operated Security Cameras for your smart home setup.

You need to know what exactly is there and if it has value (the contract, the person's electric bills past two years, and an inspection of the batteries/panels/and roof).

That could indeed be the best choice but just consider - If it's already hard to treat this like an pure investment decision now, think how hard it will be once you get into it....