opinion:frater_secessus:panelsizesforinsolation
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opinion:frater_secessus:panelsizesforinsolation [2022/05/08 10:43] frater_secessus [Amount of solar wattage required per 100Ah of Pb] |
opinion:frater_secessus:panelsizesforinsolation [2022/05/08 10:45] frater_secessus [Amount of solar wattage required per 100Ah of Pb] |
This page is a rough attempt to show how geographical location and meteorological conditions affect the amount of solar wattage one needs. | This page is a rough attempt to show how geographical location and meteorological conditions affect the amount of solar wattage one needs. |
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**Reminder:** available sunlight ([[electrical:solar:output#insolation|insolation]]) is expressed in Hours of Full Sun Equivalent (FSE) compared to lab conditions. So an entire cloudy day might provide only 2 hours of FSE, meaning it would be the same amount of sunlight as 2 hours of full sunlight under lab conditions (1000w/sq meter). Therefore **2 hours of FSE = 2kWh**.((and 7.2MJ (megajoules) for our metric friends)) Multiply [FSE for the time/place] x [rated panel wattage] to see what see how many watts your system would harvest on average if it were perfectly efficient.((hint: it's not)). Example: 4 hours of FSE x 200w = 800Wh, or 0.8kWh, before various losses.((see Assumptions section at bottom for typical losses)) | **Reminder:** available sunlight ([[electrical:solar:output#insolation|insolation]]) is expressed in Hours of **Full Sun Equivalent (FSE)** compared to lab conditions. So an entire cloudy day might provide only 2 hours of FSE, meaning it would be the same amount of sunlight as 2 hours of full sunlight under lab conditions (1000w/sq meter). Therefore **2 hours of FSE = 2kWh**.((and 7.2MJ (megajoules) for our metric friends)) Multiply [FSE for the time/place] x [rated panel wattage] to see what see how many watts your system would harvest on average if it were perfectly efficient.((hint: it's not)). Example: 4 hours of FSE x 200w = 800Wh, or 0.8kWh, before various losses.((see Assumptions section at bottom for typical losses)) |
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Historical weather info is also used to calculate FSE, so good/bad weather is already baked into the average. | Historical weather info is also used to calculate FSE, so good/bad weather is already baked into the average. |
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Ambient temperatures also affect panel output, and that is silently factored into the bottom table. | |
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Assumptions: | Assumptions: |
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| * panel output is temperature-derated according to daily average high at each time/place |
* **no other loads** other than charging are present | * **no other loads** other than charging are present |
* AGM deep cycle battery is discharged to [[electrical:depth_of_discharge|50% DoD]] nightly and [[electrical:12v:charging|fully charged]] the next day. Charging efficiency 90%. | * AGM deep cycle battery is discharged to [[electrical:depth_of_discharge|50% DoD]] nightly and [[electrical:12v:charging|fully charged]] the next day. Charging efficiency 90%. |
opinion/frater_secessus/panelsizesforinsolation.txt ยท Last modified: 2024/03/20 00:01 by frater_secessus