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opinion:frater_secessus:how_much_excess_solar_power [2022/12/14 12:58] frater_secessus [How much extra solar power do I have?] |
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? ====== | ||
Yes, we can use [[electrical: | Yes, we can use [[electrical: | ||
- | But how can we tell how much untapped power the solar setup leaves on the table because aren't demanding it? Put another way: how much more stuff could we be running off the solar? | + | But how can we tell **how much untapped power does our solar have in reserve?** Put another way: how much more stuff could we be running off the solar? |
- | + | ===== TLDR ===== | |
- | ===== Pareto summary | + | |
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- | ===== empirical | + | ===== direct |
+ | |||
+ | Plug it in and see if the solar can support it [[electrical: | ||
+ | |||
+ | The downside is this is a YES/NO answer; | ||
+ | |||
+ | ===== prediction ===== | ||
+ | |||
+ | ==== looking up daily insolation (FSE) ===== | ||
+ | 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. | ||
- | ===== observation and prediction ===== | + | To predict daily harvest we will use |
+ | * FSE | ||
+ | * your panel wattage | ||
+ | * and your system' | ||
- | ==== overall system efficiency ==== | ||
- | You can get a feel for overall system efficiency by | ||
- | - watching your system over time, as described above | ||
- | - comparing real-time harvest to theoretical harvest | ||
+ | ==== calculating power available (W) ==== | ||
- | ===== average power harvest | + | Real-time |
- | power available | + | This cosine is [[https:// |
+ | **Example**: | ||
+ | ==== finding and using system efficiency ==== | ||
+ | For [[electrical: | ||
+ | You can see our system' | ||
+ | panel wattage x system efficiency x cosine | ||
+ | >> ...if your mppt controller typically yields 83% after derating, and the calculated cosine is .70 then you might expect ~116w in clear conditions at that time in that location. (200 x .83 x .7 = 116.2). |