From an energy standpoint, for those you would typically put on your house, monocrystalline PVs tend to be more efficient than polycrystalline in real life applications. Two great companies for these are Sanyo and Sunpower. That doesn’t necessarily mean that these are the best for your application, because it doesn’t take into account cost. Thin film solar panels can offer lower costs per watt produced. And if you are looking at PV, you should also have looked at solar thermal, which tends to have a much better payoff period and tends to be low-hanging fruit as far as solar goes.
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