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electrical:solar:panel-bank_ratio [2020/06/24 21:05] frater_secessus [1:2 underpaneling] |
electrical:solar:panel-bank_ratio [2022/06/05 23:07] frater_secessus [1:1] |
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===== 1:1 ===== | ===== 1:1 ===== | ||
//1:1// == 200W solar + 200Ah battery bank. | //1:1// == 200W solar + 200Ah battery bank. | ||
- | This generally considered the minimum, | + | This is generally considered the minimum, |
- | [[electrical: | + | |
+ | [[https:// | ||
+ | |||
+ | 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 ===== | ||
//2:1// == 200W solar + 100Ah of battery. | //2:1// == 200W solar + 100Ah of battery. | ||
This slightly [[electrical: | This slightly [[electrical: | ||
+ | |||
+ | Working backwards, successfully fully charging lead-chemistries by 2:1 solar requires about 4.25hrs of Full Sun Equivalent on MPPT, and about 4.85hrs FSE with PWM. | ||
+ | |||
+ | On average, this would work in Little Rock, San Francisco, Phoenix, Birmingham, Atlanta, New Orleans, Albuquerque, | ||
+ | |||
===== 3:1 overpaneling ===== | ===== 3:1 overpaneling ===== | ||
//3:1// == 300W solar + 100Ah of battery. | //3:1// == 300W solar + 100Ah of battery. | ||
This significantly overpaneled configuration generally yields an excess of power, useful in rain, low winter sun, overcast conditions, etc. | This significantly overpaneled configuration generally yields an excess of power, useful in rain, low winter sun, overcast conditions, etc. | ||
' | ' | ||
+ | |||
+ | Working backwards, successfully fully charging lead-chemistries by 3:1 solar requires about 2.83hrs of Full Sun Equivalent on MPPT, and about 3.25hrs FSE with PWM. | ||
+ | |||
+ | On //average// this this opens up everything but Canada and Anchorage AK. | ||
===== 1:2 underpaneling ===== | ===== 1:2 underpaneling ===== | ||
//1:2// == 100W solar + 200Ah of battery. | //1:2// == 100W solar + 200Ah of battery. | ||
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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 |