Our Solar Panel Installation - Epilogue, Three Years Later

In 2014, my wife and I took the plunge and installed solar panels on our house. In late 2016, we had an opportunity to move back to our home town in Michigan. In November of 2016, we said a tearful goodbye to sunny California, our wonderful friends and neighbors, our home of nearly 20 years, and its solar arrays. Since I know very few people who have bought and sold their own panels, I thought I ought to write about our experience. This page is the epilogue to Our Solar Panel Installation.

How well did the system work?

An aerial view I shot with a quadcopter!

The system worked flawlessly from September of 2014 to November of 2016. It produced 19.5MWh during that time, which was about 5% less than what the Enphase system predicted.

A magificent creature

I was expecting peak output during the summer, but the system consistently did its best and outperformed the Enphase estimates during the spring. On its very best day, April 29th 2015, the system produced 37.3kWh. It almost broke that record a year later on its second best day, April 25th 2016, when it made 37.1kWh. I have to assume that is due to air quality and temperature. Summer in the east bay can be hazy and hot, but April is usually clear and cool when it isn't raining. Those years, 2015 and 2016, were at the tail end of a critical drought in California, so there was no rain, and the high temperatures on the record setting days was only 73F and 68F. By July, when Enphase and I were expecting peak production, the high temps were in the low 100's, and production was down.

The likely culprit.

I did hose off the panels one time. The Enphase system showed me that one of the panels was underperforming slightly, so out of curiosity I went up to see why. Sure enough... it was soiled. Badly. I suspect it was from a turkey (we had flocks of turkeys roaming around our neighborhood, and they do fly onto roofs) or from a buzzard, but I'm no ornithologist. From the size of the mess, it could have been a condor, albatross, or a maybe a small winged horse. Anyway, the hose took care of that panel, and spraying the dust off the others didn't really seem to make any measurable difference in production for the rest of the array.

Late in 2016, one of the trees started shading some of the panels in the southern array during a small part of the day. The mircoinverters did what they were supposed to do! The shaded panels dropped production, and the rest of the array kept making juice. If I'd have gone with a standard string system without the inverters, the whole array would have suffered, and I'd have been into some serious tree surgery.

On the whole, I'd say the system was great, and we were very happy with how it performed!

Did it cover your electrical consumption?

Every little bit helps.

The system covered our electricity and then some. Cobalt spec'd out the system to support our existing electrical consumption along with the addition of a plug in electric car. We moved before buying the car, so we had a serious surplus of electricity for the time that we owned the system. PG&E ended up owing us money for electricity at the end of the net metering cycles. Its not a good way to make money though. In CA, you buy power from them at the residential rate, they buy it from you at the wholesale rate, so after the grid connection fees, they only owed us a couple of bucks. It wasn't much, but getting those couple of bucks sure felt great!

Did it actually improve the value of our home?

Selling a home is a complex thing full of voodoo, lenders, appraisers, real estate agents, comparables, and made up numbers, so its even hard to say whether or not we directly recouped the value of the solar system in the sale of our home. Why? Well, the price of housing in California is notoriously high. The installed cost of our system ended up being less than 2% of what we were able to sell the house for. The range of proposed sale prices that the relators were suggesting we try offer the house at was a lot wider than that. Had the same system been installed on a similar house someplace in the country with a less extreme housing cost, it would have represented a larger percentage of the sale price, and we probably would have a better idea of whether the system increased the home's value more than it's purchase price.

Huh? What panels?

Subjectively, our Realtor said she heard from several of the prospective buyers that the solar panels (which were called out prominently in our real estate listing) were a big selling point in their decision process. We also heard from our Realtor that some people who saw the house and expressed interest in it didn't even realize until later that it had solar panels! How cool is that? Clean renewable energy that many people won't even notice if they aren't looking for it!

Diagram of how a home appraiser actually does his job.

Objectively, I know that the panels were accounted for in at least one buyer's loan appraisal. Normally, you don't get to see that kind of appraisal, but because of some last minute dickering, we got got a chance to review it in detail. We'd given the buyer access to all of Cobalt's excellent system documentation, so the appraiser was able to correctly asses the value of the system with the right depreciation rate. My only complaint is that he used the after-tax-refund price for the value basis, instead of the up-front price. I suppose that since the federal credit is still in effect, that's not an unreasonable thing to do.

So... while I can't say for sure that the solar panels added value above and beyond their initial cost, I'm reasonably certain that I was able to recoup my investment in the sale price of the house.

Would you buy it again?

I would buy residential solar panels again in a heartbeat! First, I just love the technology. Simple, clean, efficient, no maintenance, no inconvenience... what is not to love?

Ten year warranty my ass.

Well, I do know that I won't buy Suniva panels again. I went with Suniva because of a combination of price point and efficiency, but what really tipped my purchase decision toward them was that the panels were made in America, and the company was opening a fabrication plant in my home state of Michigan! That plant opened to much fanfare, brought new jobs to the area, and everything was great. That is, until they sold a majority share of the company to the Chinese, went broke, and shuttered all operations three months later, without giving notice to the employees or customers.

Still HQ'd in California... for now.

I'm also not convinced that Enphase isn't going to go the same route. Their technology story is great, but Solar is a cutthroat business. When a company holds a share price around eighty cents down from a high of over sixteen dollars, you've got wonder if they maybe brought a white flag to the knife fight. Time will tell, I suppose.

Don't get the wrong idea- I'm not going to let casualties in the technology war dissuade me from installing panels again, and you shouldn't either! I strongly believe that the pursuit of clean renewable energy is the right thing to do. Companies come and go all the time as technology changes and improves. Its not a big deal, its part of how things get better, and an investment in one technology company today will help fuel the industry for tomorrow. I'm excited to be a part of it! I just wish that we'd hurry up and get energy storage up to speed, so that I could disconnect from all types of CO2 generating electricity. When batteries become a reasonable option ( and I don't think it will be long! ) you'd better believe I'm going to have those too!