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# Solar Panel: How Much Money Do Solar Panels Cost? (10/2/2011)

planning to get one, for a store/house, we use alot of electricity at least 1500-3000 dollars a month. how much money would this save us? how big would we have to get the solar panel?[aproximately]
how much would i have to spend to reduce the cost to 1000 a month at the least?

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Nata T October 2, 2011 at 11:29 am

In the US, the average electric cost \$ .15/kw-hr. \$ 2500 means you are using 16700 Kw-hr/month or 550 kw-hr/day.

Since solar panel only make peak kw for about 5 hours per day (in sunny places like (AZ) you will need a 110 kw system. Solar systems cost about \$ 7/watt so your system will cost about \$ 750,000. The government my pay for about \$ 250,000, so be prepared to spend one half a million dollars.

You will also spend about \$ 250/month on maintenance of the system. The system will lose about 1%/year of it’s efficiency, so the system will be paid for in 240 months, or 20 years. With in 5 years after the system is paid for, they will have to be replaced, the cost will be another 2 million dollars.

Another One October 2, 2011 at 12:19 pm

Have you considered getting a commercial energy audit? You might save more money by conservation. I know residential energy audits cost about \$ 350/ home.

Your audit would probably depend on sq footage. Now would be a good time to do it because under a Cap and Trade system, energy audits will be highly sought after.

Matthew B October 2, 2011 at 12:39 pm

Consider installing building energy measurement first, which cost less than \$ 200. Work out what is using the energy and if there are more efficient options.
Consider co-generation which uses gas for an energy input and electricity generation and heat as an output.
Use the Solar Energy Calculator to work out how much solar panel area is needed to generate the remaining power needed in you are of the world.