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opinion:frater_secessus:how_much_excess_solar_power [2022/12/14 13:37] frater_secessus [system efficiency] |
opinion:frater_secessus:how_much_excess_solar_power [2023/04/21 11:50] (current) frater_secessus [Pareto summary] |
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====== How much extra solar power do I have? ====== | ====== How much extra solar power do I have? ====== | ||
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- | ===== Pareto summary | + | ===== TLDR ===== |
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- | ===== empirical | + | ===== direct |
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- | + | ||
- | ===== observation and prediction ===== | + | |
- | + | ||
+ | Plug it in and see if the solar can support it [[electrical: | ||
- | ==== overall system efficiency ==== | + | The downside is this is a YES/NO answer; |
- | You can get a feel for overall system efficiency by | + | ===== prediction ===== |
- | - watching your system over time, as described above | + | ==== looking up daily insolation (FSE) ===== |
- | - comparing real-time harvest to theoretical harvest | + | |
+ | Hours of Full Sun Equivalent (FSE) is a convenient way to think of the amount of sunlight reaching the ground over the entire day. 4.5 hours of FSE means 4.5kWh of power reaching the ground per square meter. | ||
+ | To predict daily harvest we will use | ||
- | ===== average power harvest for a given time/place ===== | + | * FSE |
+ | * your panel wattage | ||
+ | * and your system' | ||
- | ==== theoretical power available ==== | ||
- | === predicted daily harvest === | ||
- | === predicted harvest at a specific time === | ||
- | Real-time harvest is a bit easier since there is no time component. | + | ==== calculating power available |
- | From [[electrical: | + | Real-time harvest is a bit easier since there is no time component. |
- | > Examples: if you have 200w of panels, your mppt controller typically yields 83% after derating, and the calculated | + | This cosine is [[https:// |
+ | **Example**: | ||
- | ==== system efficiency ==== | + | ==== finding and using system efficiency ==== |
+ | For [[electrical: | ||
+ | You can see our system' | ||
- | If observed 94w at that place/time the overall | + | panel wattage x system efficiency |
- | Continuing from the example above: | ||
- | >> | + | >> |