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opinion:frater_secessus:panelsizesforinsolation [2020/06/24 18:21] frater_secessus [Amount of solar wattage required per 100Ah of Pb] |
opinion:frater_secessus:panelsizesforinsolation [2022/05/08 10:44] frater_secessus [Solar panel sizing for different geographical areas] |
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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. | ||
- | Ambient temperatures also affect panel output, and that is silently factored into the bottom table. | ||
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===== Amount of solar wattage required per 100Ah of Pb ===== | ===== Amount of solar wattage required per 100Ah of Pb ===== | ||
- | These figures have temperature-related derating baked in, then are rounded off to usable numbers. | + | These are crude estimates about the panel wattage required |
- | Assumptions: | + | ^ Location |
- | * battery is discharged to [[electrical: | + | | Seattle - avg | 280w | 329w | 140w | 103w | |
- | * MPPT controller is 95% efficient | + | | Seattle - Dec | 921w | 1056w | 528w | 388w | |
- | * PWM yields, overall, 85% of MPPT yield. | + | | Seattle - Jul | 163w | 192w | 82w | 60w | |
- | * isolator charging is done in early morning, and discontinued when alternator | + | | | | | | | |
- | * DC-DC (or generator) charging is is done in early morning, and discontinued when Vabs is achieved. | + | | SLC - avg | 238w | 281w | 119w | 88w | |
- | | + | | SLC - Dec | 473w | 556w | 236w | 174w | |
- | | + | | SLC - Jul | 156w | 183w | 78w | 57w | |
+ | | | | | | | | ||
+ | | Phoenix - avg | 200w | 235w | ||
+ | | Phoenix - Dec | 369w | 434w | 184w | 135w | | ||
+ | | Phoenix | ||
+ | Assumptions: | ||
+ | * **no other loads** other than charging are present | ||
+ | * AGM deep cycle battery is discharged to [[electrical: | ||
+ | * MPPT controller is 95% efficient | ||
+ | * PWM yields, overall, 85% of MPPT yield. | ||
+ | * [[electrical: | ||
+ | * [[electrical: | ||
+ | * [[electrical: | ||
+ | * 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 10% less panel than AGM due to better charging efficiency. | ||
- | ^ Location | ||
- | | Seattle - avg | 250w | 300w | any | any | | ||
- | | Seattle - Dec | 950w | 1100w | 275w | 150w | | ||
- | | Seattle - Jul | 150w | 175w | any | any | | ||
- | | | | | ||
- | | SLC - avg | 200w | 250w | any | any | | ||
- | | SLC - Dec | 425w | 500w | 125w | any | | ||
- | | SLC - Jul | 150w | 175w | any | any | | ||
- | | | | | ||
- | | Phoenix - avg | 175w | 200w | any | any | | ||
- | | Phoenix - Dec | 325w | 400w | any | any | | ||
- | | Phoenix - Jul | 125w | 150w | any | any | |