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--- electrical:solar:status [2023/08/09 13:54]
frater_secessus [transitioning to float]
+++ electrical:solar:status [2023/09/02 12:48]
frater_secessus [panel specs]
@@ Line 33: / Line 33: @@
 ===== first collect a few numbers =====
 To tell at a glance what your system is doing you need to find a couple pieces of info about your system.  You will only have to look them up once;  it might be worthwhile to write them down on a sticky note near your solar gear.
+{{ https://www.researchgate.net/profile/Kanaga-Gnana/publication/237049790/figure/fig3/AS:299465748566018@1448409606696/Characteristic-Curve-of-The-Solar-Panel.png?125}}
+==== panel specs ====
+The [[electrical:solar:panels#specifications|specs]] we are interested in are:
+  * **Vmp**, the voltage at which the panel makes max power under laboratory conditions((likely lower in reality))
+  * **Voc**, the highest voltage the panel will put out under normal cirumstances.  At Voc the panel produces no current and therefore no power (Voc x 0A = 0W)
+  * when in use, **Vpanel** is the panel voltage reported by the controller.  PWM controllers might not report this value.
+On the curve pictured at the right Vmp is at the peak of the red voltage line, and Voc is on the far right where output crashes to 0W.
+==== controller ====
   * **Vabs** - the charge controller's Absorption [[electrical:solar:charge_controller_setpoints|setpoint]], hopefully tweaked to your battery manufacturer's [[electrical:12v:charging|charging]] recommendation.  Note:  EpEver and Renogy controllers often refer to Absorption as //Boost//.

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