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--- electrical:solar:panels [2020/06/16 16:06]
frater_secessus [panel voltage]
+++ electrical:solar:panels [2021/06/05 17:35]
frater_secessus [Specifications]
@@ Line 111: / Line 111: @@
-  * **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.
@@ Line 144: / Line 144: @@
 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.
-  * **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).

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