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What size solar panels do you need if you use 2939 kWh each month?
Wiki User
∙ 14y ago
If you are going gridable inverter (I recommend) you would need to assume that you will be running around 50% efficency on your panels. Thus a 100 watt panel will supply to the grid roughly 50 watts. You need to determine your area for sunshine. Hours of full sunlight per day is important. In Wisconsin, where I live we get the equivalent of two hours of full light per day on average. That means a 100 watt panel will give me about 100 watts per day to apply to the grid. Assuming 30 days in a month that means a 100 watt panel will give me about 3 KWH's per month. To cover your needs you would need roughly 1000, 100 watt panels in Wisconsin to give that power. At a wholesale Price of $3.00 a watt to would be looking at $300K to supply that level of power.
That number cuts in half if you live in Arizona. They get about 4 hours of full sunlight a day, but the problem is that warm weather lowers the output of solar, just as snow must be removed from my panels.
The issue becomes how much of your 3000 KWH's can you get rid of each month!? I have my home running on roughly 600 KWH's a month. I managed to get the entire system down to under $30K by cutting corners. Do not look at payback, as it never occurs. These are not green system either! (Wives tales will quickly die when you start working these creatures!)
While they are far from green or cost effective, my power is steady, which was a problem prior to getting the panels. I live in the country and power is a needed issue that the local power company just did not care enough to worry about.
I spend about $200 a year in maintenance costs. Wind is also a workable backup if money is no object!
Good luck! If you wish pics and more details on my system, message me!
Wiki User
∙ 14y ago
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