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opinion:frater_secessus:panelsizesforinsolation [2021/12/30 14:22] frater_secessus [Table] |
opinion:frater_secessus:panelsizesforinsolation [2022/05/08 10:45] 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. | ||
- | 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 [[electrical: | + | These are crude estimates about the panel wattage required |
- | + | ||
- | Assumptions: | + | |
- | * battery is discharged to [[electrical: | + | |
- | * MPPT controller is 95% efficient | + | |
- | * PWM yields, overall, 85% of MPPT yield. | + | |
- | * isolator charging is done in early morning, and discontinued when alternator no longer raises voltage. | + | |
- | * DC-DC (or generator) charging is is done in early morning, and discontinued when Vabs is achieved. | + | |
- | * wattage listed as '' | + | |
- | * solar-only charging the same number of amps into lithium would require about 15% less panel than lead. Lithium can be charged successfully off alternator/ | + | |
- | + | ||
^ Location | ^ Location | ||
- | | Seattle - avg | 219w | 258w | 110w | 81w | + | | Seattle - avg | 280w | 329w | 140w | 103w | |
- | | Seattle - Dec | 950w | 1100w | + | | Seattle - Dec | 921w | 1056w |
- | | Seattle - Jul | 150w | 175w | any | + | | Seattle - Jul | 163w | 192w | 82w |
| | | | | | | | | | | | | | ||
- | | SLC - avg | 200w | 250w | any | + | | SLC - avg | 238w | 281w | 119w | 88w | |
- | | SLC - Dec | 425w | 500w | 125w | any | + | | SLC - Dec | 473w | 556w | 236w | 174w | |
- | | SLC - Jul | 150w | 175w | any | + | | SLC - Jul | 156w | 183w | 78w |
| | | | | | | | | | | | | | ||
- | | Phoenix - avg | 175w | 200w | any | + | | Phoenix - avg | 200w | 235w | 100w | 73w | |
- | | Phoenix - Dec | 325w | 400w | any | + | | Phoenix - Dec | 369w | 434w | 184w | 135w | |
- | | Phoenix - Jul | 125w | 150w | any | + | | Phoenix - Jul | 149w | 175w | 74w |
+ | |||
+ | Assumptions: | ||
+ | |||
+ | * panel output is temperature-derated according to daily average high at each time/ | ||
+ | * **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. |