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opinion:frater_secessus:solar_harvest [2020/09/24 14:12] frater_secessus created |
opinion:frater_secessus:solar_harvest [2023/02/17 15:20] frater_secessus [correlation with available direct light] |
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===== observations ===== | ===== observations ===== | ||
- | Overpaneled configurations (relatively high panel watt to batter | + | Overpaneled configurations (relatively high panel watt to battery |
- improved charging in adverse conditions | - improved charging in adverse conditions | ||
- | - // | + | - // |
- | Note that overpaneled systems are typically only making | ||
* full sun normal | * full sun normal | ||
- | * 305w, 54% of rated, 4 | + | * 305w, 54% of rated |
* bright sun through thin / cirrus clouds, shadows thrown | * bright sun through thin / cirrus clouds, shadows thrown | ||
* 312w at 11am, sea level. | * 312w at 11am, sea level. | ||
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* thunderstorms, | * thunderstorms, | ||
+ | ===== correlation with available direct light ===== | ||
- | ===== ununsual scenarios ===== | + | This is harder to grasp and compute, but increases accuracy by factoring in location, time, etc.((It cannot account for // |
+ | - find solar zenith angle with app or calculator | ||
+ | - derive cosine of the above; this is the percentage of direct sunlight landing on a flat surface | ||
+ | - multiply this value by panel wattage | ||
+ | - the result is the theoretical direct light available at that time/place under clear skies.((since MPPT-based system losses typically are -15% and indirect lighting is +15%, an MPPT-based system might make this direct-light power level under clear skies.)) | ||
+ | I have observed the following cosine-based direct light percentages: | ||
+ | * clear skies: | ||
+ | * bright overcast skies (shadows thrown): | ||
+ | * overcast: 58% of theoretical direct sun | ||
- | * exceptionally high yield, 90% of rated | ||
- | * [[http:// | ||
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+ | ===== ununsual scenarios ===== | ||
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+ | * exceptionally high yield, 90% of rated | ||
+ | * [[http:// | ||
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