How does the Yield Predictor help in making an informed purchase decision? Will investing in a solar electric system really pay off? There are many factors to consider: sunlight levels at your location, whether or not your roof is facing in a favorable direction, etc. You are well advised to begin your undertaking by gathering information how much electricity your roof is expected to deliver. It's good to familiarize yourself with the subject to the extent that you are sure to understand and verify a quote given by your installer. The Yield Predictor offers a professional and independent evaluation of energy production and is so intuitively to use that everyone can easily create his own solar site analysis.

How does a search in the PV Survey Directory help with choosing solar products and finding a reputable installer? Informed customers make better choices: If you are thinking about buying a photovoltaic system and need some quality assurance information, check out our PV System Survey. You can search this database for manufacturer brands and installer companies. Look out for systems of the same brand or systems in your ZIP code area. How do comparable systems score on the performance scale? Check for the PR-value, the so-called performance ratio. This value should be at least 70%, preferably 80% or higher.