its good , for everone , and you can earn on it
Actually, unless you're doing a huge amount of work yourself, you'll lose out on it. Installed solar panels are ~$3-5 dollars per watt on property you already own. ROI is over 20 years at current electricity prices (averaged out priced throughout the entire USA). Solar panels have a 15-25 year life-span, so you're playing the numbers game, and odds are against you.
Here's an example from a quick google search:
http://www.wholesalesolar.com/gridtie.htmlIt looks like you can buy the equipment for $1.50 to $2 per watt, depending on the size of the system, and it comes with a 25-year warranty. I'm not sure how much installation would cost, but I have a hard time believing that it would cost more than a few thousand. It looks like federal tax credits can also knock off up to 30% of the installation cost. Let's say you get the system that produces about 866 kWh/month for $10,300. Let's even say it costs as much to install as the panels cost. So let's figure $21,000 total for the system, which would be a little less than $15,000 after tax credits. I hate it when they say "up to" 866 kWh/month, so let's round that down to 800 to be conservative. Over 25 years, you should get 800*12*25=240,000 kWh out of it. Let's say you pay $0.08/kWh, which is also fairly conservative. You'd save $19,200. So you're already up at least $4,000 over the cost of the system, and that's not even taking into account rising electricity costs over time. So if you have the cash, it's probably worth it even now, but the savings isn't huge yet.
Great job, but no. During winter months, your "up to" 866 kWh/month goes down to ~100-200 kWh / month. Also, as the solar cells age, they become less efficient.
"Monthly Output based on 5 sun hours per day" - Wow, that's a LOT of sun time every day. My town has a solar array installed, and all the statistics are available publicly, so it helps quite a bit estimating my ROI. Here's the current stats on a 2 MW solar farm:
July is one of the best months, so we're just hitting 5 hours a day. But look at months like December / January. That's around an hour average of sun per day!
Your math also doesn't include maintenance of kit, replacing failing kit (sure, the equipment is under warranty, but the labor to remove it, ship it back, get a new piece isn't), any fees your carrier has associated with tying your solar system to the grid.
As opposed to a decent stock portfolio in which I have a 10% ROI per year. Hmm.