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simple calculation for solar pv payback

Too many people call us everyday and ask how the figure out the payback period of an investment in a solar pv system. Today, I wanted to focus on showing you how to simply calculate how long it will take you to break even on a solar electric system you maybe considering for a home or business. (Total system cost after incentives) + (Maintenance costs x Equipment lifetime)—————————————————————————————————-(Annual system kWh production) x (Your electric rate cost per kWh) Maintenance costs = $0.02/Annual system kWh productionEquipment lifetime = 25 – 30 years You can forecast annual system kWh production using PVWatts Check your electric bill for your cost per kWh, if you can’t figure out what your average cost for every unit of electricity you consume, then it’s going to be impossible to forecast a payback period for your investment in a solar electric system. Get to know your electric...

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Calculating the Economics of a solar power system

Solar Power shoppers always want to know how to size a system and the output of a system to eliminate their entire bill. Today we’ll cover how to calculate the economics of solar photovoltaic panels. First we need to start with your electric bill so go grab it and have it in front of you, and find out how many kWh (kilowatt hours) you are averaging per month. Step 1 – Figuring out your kWh usage per day For example, your bill indicates you are averaging 600 kWh a month. 600 kWh————– = 20 kWh / day30 Days Step 2 – Calculating the size of solar panel array you will need To figure out how many square meters of solar panels we will need to eliminate your usage. A solar insolation map will be needed to see how much sunlight falls on your south facing surface. Use the one below to find your area For our example, lets use an insolation of 5 sq. meters of sunlight / day 20 kWh/day—————————————————— = 33 sq. meters of panels5 sq. meters/day * 0.12 efficiency The efficiency number can be obtained from any solar panel specification sheet, the efficiency of solar panels range depending on the solar panel you purchase, so if you are looking for accuracy, find the spec sheet and plug in a real efficiency number in your calculation. Step 3 – Output of the system Now that you know how many sq. feet of solar panels you will need lets calculate how many kW (kilowatts) of solar power will the system output for you. 0.12 efficiency of solar panel * 33 sq. meters = 3.96 peak kW Step 4 – Cost of electricity over the life of the system.Now you will need to figure out how much you are being charged per kWh by looking at your bill…depending on where you are planning to install the solar power system, your cost per kWh can range, it can be very cheap to highly expensive. In the United States the cost per kWh ranges from .04 cents per kWh to higher than .20 cents per kWh. The MSRP for a 3.96 kW system is about $35,000 dollars, so lastly lets calculate the how much a solar power system would cost per kWh through its lifetime. $35,000 MSRP cost of system——————————————————————— = 0.16 per kWh20 kWh * 365 days * 30 years system life There you have a short 101 course on how to calculate the money factor for a solar power system. Go ahead, calculate your own requirements and see if solar power makes sense in your area. I’d like to...

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