Practice Quiz

Green Plumbing

Category - Solar Hot Water

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Which of the following are approximate efficiency percentages, respectively, for solar thermal and solar photovoltaic commercially-available cells? (As of ~2007)
  1. Up to 90%; 15% to 20%
  2. Up to 80%; 9% to 14%
  3. Up to 60%; 24% to 29%
  4. Up to 50%; 12% to 16%
Explanation
Answer: B - Solar thermal cells are up to 80% efficient, while solar photovoltaic cells are 9% to 14% efficient. This substantial difference merits deeper consideration of solar thermal installations. However, as of 2007 the US had only about 12,000 solar thermal installations, with about half of those in Hawaii.
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