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electrical:solar:panels [2023/05/04 20:06] frater_secessus [Panel voltage] |
electrical:solar:panels [2024/01/04 16:54] (current) frater_secessus [STC and NOCT] compare |
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To avoid overcharging, | To avoid overcharging, | ||
- | [[electrical: | + | [[electrical: |
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- | **As a general rule, expect panels to put out 60% of their rating** | + | |
There are several types of PV widely available on the market, and many more in research stages. | There are several types of PV widely available on the market, and many more in research stages. | ||
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- | ===== Efficiency | + | ===== efficiency |
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+ | The formula for panel efficiency is simply rated watts / square meter. | ||
Higher efficiency doesn' | Higher efficiency doesn' | ||
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In general, mono has higher efficiency than poly, and poly has higher efficiency than thin film. | In general, mono has higher efficiency than poly, and poly has higher efficiency than thin film. | ||
- | The cost of higher efficiency panels typically outstrips the increase power, so unless you are tight for space they typically aren't a good value for money. | + | The cost of higher efficiency panels typically outstrips the increase power, so unless you are tight for space they typically aren't a good value for money. |
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+ | ===== longevity ===== | ||
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+ | Framed panels are often warranted to make 80% of their rated output for 25+ years. | ||
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+ | There is [[https:// | ||
- | > At zenith, sunlight provides an irradiance of just over 1 kilowatt per square meter at sea level. Of this energy, 527 watts is infrared radiation, **445 watts is visible light**, and 32 watts is ultraviolet radiation. -- [[https:// | ||
- | Mono panels can capture about 15-20% of this visible light energy. | ||
===== Specifications ===== | ===== Specifications ===== | ||
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While NOCT may be useful for gauging normal harvests, STC is used for system component((like controllers)) sizing because the panels really can make STC power((or even more)) in some real world conditions. | While NOCT may be useful for gauging normal harvests, STC is used for system component((like controllers)) sizing because the panels really can make STC power((or even more)) in some real world conditions. | ||
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+ | >> NOCT is useful for comparing two panels **[that have] the same STC rating**. A panel with a higher rated power at NOCT for example, will generally result in a higher performing panel.((https:// | ||
**PTC** ([[https:// | **PTC** ([[https:// |