I suggest you take detailed photographs with time/date stamps of the electric panel and any other pertinent parts of the system.

I looked into a solar farm, but I don't think the ROI would be very good especially considering the initial amount of investment needed.

The only repairs it needs are flooring in the kitchen and then paneling in the bathroom.I will be making 38$ in cash flow a month. 

I just got a house, however, where the brown molding and 6 panel doors are in such great shape and well made.  

You can also get in touch with several reputable contractors in your area that specialize in certain things and get some reasonable ballpark figures - electricians for panel replacements, roofers for asphalt shingle roof replacement per square, etc.

I've had paneling taken down to start rehab.

It was fairly large (over 2000'), very stylish, with luxury features like hard wood floors, solar, granite counters, nice looking cabinets, etc.I was told the fact it was prefabbed saved ~30% on construction costs which if it was the quality of the prefabs from a couple of decades ago I would not have thought it was worth the savings but this was a very fine house. 

Perhaps not.There may not be an access panel, door, etc, but what about the inspector crawling under the available area somewhere that can be opened - sans the access panel or door.

It was super easy to install, just removed a panel and shoved it up there.  

Have anyone purchased a house through bankruptcy sale with solar panels on roof?