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electrical:solar:panel-bank_ratio

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electrical:solar:panel-bank_ratio [2018/07/27 10:13]
frater_secessus [Panel:Bank ratio] 		electrical:solar:panel-bank_ratio [2020/06/24 21:47]
frater_secessus [1:1]
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 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 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.
 [[electrical:solar:rationing|Power rationing]] may be necessary. [[electrical:solar:rationing|Power rationing]] may be necessary.
 +
 +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. 
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   * the battery bank is [[electrical:12v:deep_cycle_battery#lithium_chemistries|lithium]] or some other chemistry unaffected by [[electrical:12v:psoc|partial state of charge]].   * the battery bank is [[electrical:12v:deep_cycle_battery#lithium_chemistries|lithium]] or some other chemistry unaffected by [[electrical:12v:psoc|partial state of charge]].
 Outside the above configurations, underpaneling can contribute to [[electrical:batterycide|battery murder]]. Outside the above configurations, underpaneling can contribute to [[electrical:batterycide|battery murder]].
 +
 +===== battery health =====
 +
 +Different battery types have different charging requirements:
 +
 +  * lithium - no minimum, charge at any rate up to the max
 +  * flooded lead-acid:  minimum [[electrical:12v:battery_capacity|C]]/10 (10A per 100ah of capacity)
 +    * minimum ratio with MPPT = 1.25w:1ah
 +    * minimum ratio with MPPT = 1.5w:1ah((1.44w:1ah, actually))
 +  * AGM lead-acid:  minimum [[electrical:12v:battery_capacity|C]]/5 (20A per 100ah of capacity)
 +    * minimum ratio with MPPT = 2.5w:1ah
 +    * minimum ratio with MPPT = 3w:1ah((2.88w:1Ah))
  
electrical/solar/panel-bank_ratio.txt ยท Last modified: 2023/10/22 10:45 by frater_secessus

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