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electrical:solar:panels [2020/05/17 11:14]
frater_secessus [monocrystalline] 		electrical:solar:panels [2021/06/05 17:35]
frater_secessus [Specifications]
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-  * **Nominal 12v panels** have 36 cells.  They will generally have max power (Vmp) around 17v and open circuit (Voc) around 21v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))  These are commonly found on mobile and portable installations. +  * **Nominal 12v panels** have 36 cells.  They will generally have max power (Vmp) around 18v and open circuit (Voc) around 21v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))  These are commonly found on mobile and portable installations. 
-  * **Nominal 20v panels** have 60 cells.  They will generally have max power (Vmp) around 29v and open circuit (Voc) around 36v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))  These are commonly found in residential rooftop installations. +  * **Nominal 20v panels** have 60 cells.  They will generally have max power (Vmp) around 30v and open circuit (Voc) around 36v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))  These are commonly found in residential rooftop installations. 
-  * **Nominal 24v panels** have 72 cells.  They will generally have max power (Vmp) around 35v and open circuit (Voc) around 42v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))  These are commonly found in commercial or residential ground level installations.  Due to internal construction (actually 2 36-cell segments in parallel)((https://youtu.be/ofo1HQyGG8s?t=1m22s)) they can be more resistant to partial shading.+  * **Nominal 24v panels** have 72 cells.  They will generally have max power (Vmp) around 36v and open circuit (Voc) around 42v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))  These are commonly found in commercial or residential ground level installations.  Due to internal construction (actually 2 36-cell segments in parallel)((https://youtu.be/ofo1HQyGG8s?t=1m22s)) they can be more resistant to partial shading.
  
  
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 Higher voltage panels can reduce wire costs; amps are cut in half for the same amount of wattage. Higher voltage panels can reduce wire costs; amps are cut in half for the same amount of wattage.
 They more likely to stay above charging setpoints in poor insolation or high heat. They more likely to stay above charging setpoints in poor insolation or high heat.
 +
 +
 +===== efficiency =====
 +
 +Higher efficiency doesn't mean the panel makes more power;  it means it makes more power from a given area.  100w is 100w, but you might be able to fit a 110w panel high-efficiency panel in the same space as a regular-efficiency panel. 
 +
 +In general, mono has higher efficiency than poly, and poly has higher efficiency than thin film.
 +
 +The cost of higher efficiency panels typically outstrips the increase power, so unless you are tight for space they typically aren't a good value for money.  If you are tight for space and need the power then pony up the cash and enjoy the premium product. 
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 PV are generally rated by several criteria((http://www.kg4cyx.net/solar-panel-specifications-explained/)) PV are generally rated by several criteria((http://www.kg4cyx.net/solar-panel-specifications-explained/))
   * **Power (W)**: 190 Watts.  <- rated power in Watts under lab conditions.  You can derive **price-per-watt** by dividing $/watts.   * **Power (W)**: 190 Watts.  <- rated power in Watts under lab conditions.  You can derive **price-per-watt** by dividing $/watts.
-  * **Open Circuit Voltage (V)**: 36.00 Voc  <- Volts in full sun with no load.  In practice you will likely not see Voc when hooked to the controller, but **all parts of your solar installation need to be able to cope with the theoretical Voc**.  In serial arrays the Voc ratings are added. +  * **Open Circuit Voltage (Voc)**: 36.00 Voc  <- Volts in full sun with no load.  In practice you will likely not see Voc when hooked to the controller, but **all parts of your solar installation need to be able to cope with the theoretical Voc**.  In serial arrays the Voc ratings are added. 
-  * **Short Circuit Current (A)**: 7.42 Isc  <- Amps in full sun when shorted.  Also theoretical, but **connectors and cables need to be sized to handle Isc**. +  * **Short Circuit Current (Isc)**: 7.42 Isc  <- Amps in full sun when shorted.  Also theoretical, but **connectors and cables need to be sized to handle Isc**. 
-  * **Maximum Power Voltage (V)**: 28.60 Vmp <- voltage at which max power is generated in lab conditions +  * **Maximum Power Voltage (Vmp)**: 28.60 Vmp <- voltage at which max power is generated in lab conditions 
-  * **Maximum Power Current (A)**: 6.64 Imp <- Amperage at Vmp in lab conditions+  * **Maximum Power Current (Imp)**: 6.64 Imp <- Amps at Vmp in lab conditions
  
 Note that in this example the Power (W) rating is 190, which is the Vmp x Imp (28.60 x 6.64 = 189.904W).  Note that in this example the Power (W) rating is 190, which is the Vmp x Imp (28.60 x 6.64 = 189.904W). 
electrical/solar/panels.txt · Last modified: 2024/05/28 22:01 by frater_secessus

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