Cut Your Solar Payback Time In Half By Billing Your Tenants For Electricity You Generate For Free

This year I decided to go solar at my house. The projections called for me to get the payback period within 15 years (and only 9 years if I manage to get all the tax rebates which is unlikely). I was not satisfied with a 15 year payback so I started thinking about ways I could cut that down to less than 5 years instead. Seemed to me there are 2 ways to do that :

  1. Use electricity instead of fossil fuels (buy an electric car, install an efficient electric air-air heat pump instead of using propane to heat)
  2. Sell some of the electricity I produce back to my tenants

I decided that the best course of action was to do both. Since I could not afford an electric car with the range I would need I purchased a 12,000 BTU Mitsubishi Air/Air heat exchanger from for $1599 shipped (available here). As a side not you need to get a line set with the heat pump which will add another $99-200 depending on the length. There are much cheaper Chinese units out (like 1/2 the price) there but my hope is that I’ll be able to get parts for it when it breaks and that it will last at least 10 years. I talked to lots of people with Mitsubishi heat pumps and they all love them. One thing that I really hate is this disposable society where people just throw things away rather than trying to fix them. I will do a separate article in the future on installing the heat pump and a review.


A Minisplit heat pump can heat with about 1/3 the amount of electricity as an electric space heater

This article is mainly talking about the process of connecting the breaker boxes for my tenants together and turning them into sub-panels and setting it up so that their electricity usage is automatically tracked and they are billed every month using Eyedro energy monitors.

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