Does anyone know if solar panels must be placed on a roof top? My parents live in a rural area, big open property , with a south facing hillside with nothing but weeds and ants. Could install panels on the hillside?
Right. I was just curious to see how much the productivity dropped.
This is not quite correct. South maximizes total power produced. West gives you a slight optimization for peak times. However, as far as I know, with Rocky Mountain Power what's important is not to reduce during peak times but to reduce monthly usage in general. They don't do an hourly price, they do a monthly price (depending on total usage during the month). So south is better for that.
Here's an article which goes into that, and concludes that given the hourly prices in Texas the optimal alignment there is 39 degrees west of south. But like I said, that argument wouldn't apply to Utah. https://blogs.scientificamerican.com/plugged-in/so-what-direction-should-solar-panels-face/
Yes, I took the plunge earlier this year. Took a month to do the installation, then another month or two to get all the paperwork in order with electrical company and with the city before we could actually start using them. But things are going well. We got enough panels to cover about 85%-ish of our electrical needs. We have a nice southern facing roof side with the appropriate area. Tax credit was $4000-$5000, somewhere in there. We got a 12-ish year loan for the panels (I'd have to look it up to be sure). The monthly payment for now is around $50 if I recall correctly, but then will increase after about a year to $100 or so. In our last monthly bill, we saved around $100 relative to the previous year. So our combined payment of panels + electricity will be about the same as our old payment for electricity alone. That was our goal; that way we're not paying anything that we wouldn't have paid already. Then the two most important points are (a) our payment won't increase (fixed rate loan) whereas the electrical bill likely would increase each year, and (b) when we pay off the loan we're sitting pretty. Sorry I'm a little fuzzy on the numbers right now, it was back in December that I worked them all out. I'm a math guy so I crunched the numbers all kinds of ways, to make sure it really made sense for us. Also for what it's worth I think we have a 20 year warranty on the panels. Panels and loan were both through Zing Solar. They had a good loan program and seem to have done solid work on the install. No complaints about the install. We own the panels ourselves (some companies just lease them), and can sell them to the new owner if for some reason we decide to sell the house.
Here are some more details on my system that I was able to look up:
We got 22 panels, each producing 260 W, for a total of 5.72 kW. Given our expected sunshine in Orem, they should produce about 8700 kW hr over the course of a year. Our total system cost was about $24K, which includes some additional energy-efficiency things (LED lightbulbs, smart thermostat). We got about $9K of federal and state tax credits (incentives), so the net price was about $15K. We wouldn't have done it without the tax credits! We got a 12 year loan at a nice interest rate from Zing or more precisely a Zing-related bank.
A few words about taxes: the money is given through tax *credits*, which means that you can only use them to pay down the taxes that you owe. It's not free money from the government above and beyond what you owe. If you owe less in taxes than the credits are good for, then you can generally roll over the credits to the next year. However, I'm not sure if the current federal solar incentives have been renewed into 2017. When I got my system they were set to expire in Dec 2016.
However, I'm not sure if the current federal solar incentives have been renewed into 2017. When I got my system they were set to expire in Dec 2016.
Here are some more details on my system that I was able to look up:
We got 22 panels, each producing 260 W, for a total of 5.72 kW. Given our expected sunshine in Orem, they should produce about 8700 kW hr over the course of a year. Our total system cost was about $24K, which includes some additional energy-efficiency things (LED lightbulbs, smart thermostat). We got about $9K of federal and state tax credits (incentives), so the net price was about $15K. We wouldn't have done it without the tax credits! We got a 12 year loan at a nice interest rate from Zing or more precisely a Zing-related bank.
A few words about taxes: the money is given through tax *credits*, which means that you can only use them to pay down the taxes that you owe. It's not free money from the government above and beyond what you owe. If you owe less in taxes than the credits are good for, then you can generally roll over the credits to the next year. However, I'm not sure if the current federal solar incentives have been renewed into 2017. When I got my system they were set to expire in Dec 2016.