Solar is universal & will work almost anywhere….but sun hours differ. Here is a list of calculators & tables to help you to estimate & choose your solar electric system.

Before calculations, its good to know bit of information about sizing stand alone PV Systems. How to optimize power needs, determine battery tank size, solar availability .

If you are not from USA, to find the minimum sun-hours for your location, click here to visit Surface meteorology and Solar Energy site. Its a renewable energy resource web site sponsored by NASA's Earth Science Enterprise Program. This site is free to use but you will have to register if this is your first visit.

Researchers at the National Renewable Energy Laboratory have developed PVWatts - a performance calculator for Grid Connected PV Systems. Its universal and easy to use.

Good solar calculators can be found also at Alternative Energy Store. To size your off grid solar electric system & find a solar panel what fits your needs use thei Off-Grid Solar Electric System Calculator.

To estimate the size (watts) of the solar panel array and grid-tie inverter you will need to meet your power needs use On-Grid Calculator.

For USA users My Estimator gives a breakdown of state & federal incentives and rebates. Calculates how many years it will take to payback your investment into solar system and gives you a list of Solar Professionals in your area.

What are typical energy savings with a complete 100% solar energy system? Click here for the answer by Astralux Power Systems. Although its for Colorado area, I hope it still can be useful.

For more information on calculators by different manufacturers click here.

If you have Do It Yourself attitude, use free downloadable solar software.

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