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electrical:solar:panel-bank_ratio [2021/11/07 16:11] frater_secessus [battery health] added Li charging info |
electrical:solar:panel-bank_ratio [2022/06/05 23:07] frater_secessus [1:1] |
===== 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:solar:output|sunny areas]] with light [[electrical:12v:loads|loads]]. It may not be enough in the winter when the sun is low and daylight short. | This is generally considered the minimum, as it can work fine in [[electrical:solar:output|sunny areas]] with light [[electrical:12v:loads|loads]] and shallow [[electrical:depth_of_discharge|depths of discharge]].((10-20% DoD?)) It may not be enough with heavier use, or in the winter when the sun is low and daylight short. [[electrical:solar:rationing|Power rationing]] may be necessary. |
[[electrical:solar:rationing|Power rationing]] may be necessary. | |
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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**. The highest is Honolulu with an average of 5.96hrs. The highest monthly average is Las Vegas in June (7.69hrs). | [[https://mouse.mousetrap.net/blog/2020/07/02/the-problems-with-11-solar-charging/|Working backwards]], fully charging lead-chemistries from 50% [[electrical:depth_of_discharge|DoD]] by 1:1 solar requires ~8.45hrs of [[electrical:solar:output#insolation_maps|Full Sun Equivalent]] on MPPT [[electrical:solar:charge_controller|controllers]], or ~9.7hrs FSE with PWM. **There is nowhere in the United States that averages 8.45hrs of FSE year around**. The highest is Honolulu with an average of 5.96hrs. The highest monthly average is Las Vegas in June (7.69hrs). |
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Workarounds: | Workarounds: |
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* add [[electrical:12v:alt_and_solar|another source of charging]] | * add [[electrical:12v:alt_and_solar|another source of charging]] |
| * use a battery chemistry that charges more efficiently and doesn't mind [[electrical:12v:psoc|PSoC]] (like [[electrical:12v:deep_cycle_battery#lithium_chemistries|lithium]]) |
* 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 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. | * fully-charging lead becomes possible with shallower cycling, like 75%. This is the equivalent of the 2:1 systems below. |