Check for government certification on any solar panel you are considering buying. Consider this tip a must. The government's seal of approval lets you know that these panels are deemed quality and efficient. Plus, some of the financial benefits of using solar panels (tax credits, etc.) rely on using certified panels.
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Your solar panels' density will impact their efficiency. Getting high density solar panels may cost you quite a bit, but after a while they'll pay for themselves because they produce more power. Be sure and compare densities before choosing a solar panel.
Be realistic about the costs of having a solar energy system. If you're paying much less than other systems that are around the same size as yours, you may have poor equipment or installation work. Like with many things in life you get what you pay for. Quality installation work and equipment isn't going to be cheap. You may have substantial savings by going with a large company, but other companies may be cutting corners to keep costs down.