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electrical:solar:panels [2025/02/28 18:47]
frater_secessus [Specifications] 1.2 |
electrical:solar:panels [2026/05/13 15:07] (current)
frater_secessus [Specifications] |
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| 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. | 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. |
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| In general, mono has higher efficiency than poly, and poly has higher efficiency than thin film. | In general, mono has higher efficiency than poly, and poly has higher efficiency than thin film. |
| 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, or Pmax)**: 190 Watts. <- rated power in Watts under [[#stc_and_noct|standard testing conditions (STC)]]. You can derive **price-per-watt** by dividing $/watts. | * **Power (W, or Pmax)**: 190 Watts. <- rated power in Watts under [[#stc_and_noct|standard testing conditions (STC)]]. You can derive **price-per-watt** by dividing $/watts. |
| * **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. Because [[https://rvwiki.mousetrap.net/doku.php?id=electrical:solar:output#solar_magnifiers|some scenarios can cause panel overvoltage]], it is common to multiply Voc x 1.2 to find the safe PV input limit. | * **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. Because [[https://rvwiki.mousetrap.net/doku.php?id=electrical:solar:output#solar_magnifiers|some scenarios can cause panel overvoltage]], it is common to multiply ''Voc x 1.2''((ie, 20% buffer)) to find the safe PV input limit. |
| * **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**. | * **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 (Vmp)**: 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 |
| 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). |
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| In real world conditions [[electrical:solar:output|power output will likely be less]] than under optimal lab conditions and the Vmp may not be at the voltage given on the label. Vmp will vary due to local conditions like temperature, shade, and sunshine. An [[electrical:solar:charge_controller|MPPT charge controller]], if present, will sweep the range of voltages regularly to find Vmp under the existing conditions. | In real world conditions [[electrical:solar:output|power output will likely be less]] than under optimal lab conditions and the Vmp/Voc may not be at the voltage given on the label. These values will vary due to local conditions like temperature, shade, and sunshine. An [[electrical:solar:charge_controller|MPPT charge controller]], if present, will sweep the range of voltages regularly to find actual Vmp/Voc under existing conditions. |
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| ==== temperature coefficient ==== | ==== temperature coefficient ==== |
