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electrical:solar:panel-bank_ratio [2020/06/24 22:30] frater_secessus [3:1 overpaneling] |
electrical:solar:panel-bank_ratio [2022/01/03 12:48] frater_secessus [1:1] added lithium |
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Working backwards, fully charging lead-chemistries by 1:1 solar means requires about 8.45hrs of Full Sun Equivalent on MPPT, and about 9.7hrs FSE with PWM. **There is nowhere in the United States that averages 8.45hrs of FSE year around**. | Working backwards, fully charging lead-chemistries by 1:1 solar means requires about 8.45hrs of Full Sun Equivalent on MPPT, and about 9.7hrs FSE with PWM. **There is nowhere in the United States that averages 8.45hrs of FSE year around**. | ||
+ | Workarounds: | ||
+ | * add [[electrical: | ||
+ | * use a battery chemistry that charges more efficiently and doesn' | ||
+ | * fully-charging lead becomes possible with attentive panel tilt, requiring only 5.5hrs on MPPT and 6.4hrs on PWM. | ||
+ | * fully-charging lead becomes possible with shallower cycling, like 75%. This is the equivalent of the 2:1 systems below. | ||
===== 2:1 overpaneling ===== | ===== 2:1 overpaneling ===== | ||
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Different battery types have different charging requirements: | Different battery types have different charging requirements: | ||
- | * lithium - no minimum, charge at any rate up to the max | + | * lithium - no minimum, charge at any rate((see [[electrical: |
* flooded lead-acid: | * flooded lead-acid: | ||
* minimum ratio with MPPT = 1.25w:1ah | * minimum ratio with MPPT = 1.25w:1ah |