This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
electrical:solar:panel-bank_ratio [2018/05/19 08:27] frater_secessus [1:2 underpaneling] |
electrical:solar:panel-bank_ratio [2020/06/24 21:47] frater_secessus [1:1] |
||
---|---|---|---|
Line 1: | Line 1: | ||
====== 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 in Watts to bank capacity in Ah. It is not gospel. | + | |
===== 1:1 ===== | ===== 1:1 ===== | ||
- | |||
//1:1// == 200W solar + 200Ah battery bank. | //1:1// == 200W solar + 200Ah battery bank. | ||
- | |||
This generally considered the minimum, though it will likely work out fine in [[electrical: | This generally considered the minimum, though it will likely work out fine in [[electrical: | ||
- | |||
[[electrical: | [[electrical: | ||
+ | |||
+ | Working backwards, successfully fully charging lead-chemisties by solar means only requires about 8.45hrs of Full Sun Equivalent on MPPT, and about 9.7hrs FSE with PWM. There is nowhere in CONUS that has 8.45hrs of FSE even under ideal conditions. | ||
===== 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: | ||
- | |||
- | |||
===== 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. | ||
- | |||
- | |||
' | ' | ||
- | |||
- | |||
===== 1:2 underpaneling ===== | ===== 1:2 underpaneling ===== | ||
- | |||
- | |||
//1:2// == 100W solar + 200Ah of battery. | //1:2// == 100W solar + 200Ah of battery. | ||
- | |||
Also known as [[electrical: | Also known as [[electrical: | ||
- | |||
* solar charging is [[electrical: | * solar charging is [[electrical: | ||
* the battery bank is [[electrical: | * the battery bank is [[electrical: | ||
- | |||
- | |||
Outside the above configurations, | Outside the above configurations, | ||
+ | ===== battery health ===== | ||
+ | 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: | ||