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opinion:frater_secessus:panelsizesforinsolation [2022/05/08 10:35] frater_secessus [Solar panel sizing for different geographical areas] fse = kWh |
opinion:frater_secessus:panelsizesforinsolation [2024/03/20 00:01] (current) frater_secessus [Amount of solar wattage required per 100Ah of Pb] |
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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. | ||
- | **Reminder: | + | **Reminder: |
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. | ||
- | Ambient temperatures also affect panel output, and that is silently factored into the bottom table. | + | |
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These are crude estimates about the panel wattage required to fully charge 100Ah of AGM from 50% DoD each day. See the list of assumptions below the chart. | These are crude estimates about the panel wattage required to fully charge 100Ah of AGM from 50% DoD each day. See the list of assumptions below the chart. | ||
- | ^ Location | + | ^ Location |
| Seattle - avg | 280w | 329w | 140w | 103w | | | Seattle - avg | 280w | 329w | 140w | 103w | | ||
| Seattle - Dec | 921w | 1056w | 528w | 388w | | | Seattle - Dec | 921w | 1056w | 528w | 388w | | ||
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Assumptions: | Assumptions: | ||
+ | * 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: | + | * AGM deep cycle battery is discharged to [[electrical: |
* MPPT controller is 95% efficient | * MPPT controller is 95% efficient | ||
* PWM yields, overall, 85% of MPPT yield. | * PWM yields, overall, 85% of MPPT yield. | ||
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* [[electrical: | * [[electrical: | ||
* due to lower internal resistance **lithium will accept more charge from alternator/ | * due to lower internal resistance **lithium will accept more charge from alternator/ | ||
- | * solar-only charging the same number of amps into lithium would require about 15% less panel than lead due to better charging efficiency. | + | * solar-only charging the same number of amps into lithium would require about 10% less panel than AGM due to better charging efficiency. |
+ | |||
+ | ===== further reading ===== | ||
+ | * factors affecting [[electrical: |