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electrical:solar:panel-bank_ratio [2017/10/01 10:49] frater_secessus |
electrical:solar:panel-bank_ratio [2020/06/24 21:05] frater_secessus [1:2 underpaneling] |
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====== Panel:Bank ratio ====== | ====== Panel:Bank ratio ====== | ||
+ | A common rule of thumb for sizing batteries to solar power relates nominal panel output in Watts to bank capacity in Ah. It is not gospel. | ||
- | A common rule of thumb for sizing batteries to solar power relates nominal panel output | + | ===== 1:1 ===== |
+ | //1:1// == 200W solar + 200Ah battery bank. | ||
+ | This generally considered the minimum, though it will likely work out fine in [[electrical: | ||
+ | [[electrical: | ||
+ | ===== 2:1 overpaneling ===== | ||
+ | //2:1// == 200W solar + 100Ah of battery. | ||
+ | This slightly [[electrical: | ||
+ | ===== 3:1 overpaneling ===== | ||
+ | //3:1// == 300W solar + 100Ah of battery. | ||
+ | This significantly overpaneled configuration generally yields an excess of power, useful | ||
+ | ' | ||
+ | ===== 1:2 underpaneling ===== | ||
+ | //1:2// == 100W solar + 200Ah of battery. | ||
+ | Also known as [[electrical: | ||
+ | * solar charging is [[electrical: | ||
+ | * the battery bank is [[electrical: | ||
+ | Outside the above configurations, | ||
- | // | + | ===== battery |
- | + | ||
- | // | + | |
- | + | ||
- | // | + | |
- | + | ||
- | For solar-only charging 2:1 or even 3:1 is recommmended. | + | |
- | For [[electrical: | + | |
+ | Different battery types have different charging requirements: | ||
+ | * lithium - no minimum, charge at any rate up to the max | ||
+ | * flooded lead-acid: | ||
+ | * minimum ratio with MPPT = 1.25w:1ah | ||
+ | * minimum ratio with MPPT = 1.5w: | ||
+ | * AGM lead-acid: | ||
+ | * minimum ratio with MPPT = 2.5w:1ah | ||
+ | * minimum ratio with MPPT = 3w: | ||