We had to replace the driveway and other electrical code issues which added around 9k of additional rehab.

Rent minus mortgage does not equal cashflow.Taxes (after purchase re-assessment if purchase price is higher than current city valuation)InsuranceWaterSewerGas/Electric (if payed by owner)RepairsCapital Expenditures VacancyProperty management (even if you intend to self manage, calculate this for the future if you eventually want to be hands off)Trash removalDon't go with your blinders on, do a real analysis on what the actual expenses will be.

Does it need new electrical, plumbing, heat, HW?

There may be some type of electrical heating tape that can be applied in susceptible conditions.

Right away I'm thinking this isn't a good idea because the current electric work was done before I purchased the duplex two years ago and I don't know who the previous landlord had do it.

I didn't disagree with your information, but your choices because you were not fully aware of how I was "stitching" all the info together from electric sources. 

We moved the dangerous non code complaint electric mast and panel.

Plowing, future buildouts, electrical, plumbing, landscaping.

Several questions come to mind are:1. usually with solar, PG&E sends an annual bill based on difference between electricity produced vs consumed for the year.

electric insert ?