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--- electrical:solar:pwm_tweaking [2025/03/18 16:35]
frater_secessus [PWM's achilles heel] sag
+++ electrical:solar:pwm_tweaking [2025/04/22 17:59] (current)
frater_secessus [panel selection]
@@ Line 35: / Line 35: @@
 Here are steps to take to maximize power from the PWM controller, in order from greatest effect to least effect.
+==== panel selection ====
+Choose panels for your PWM with a [[electrical:solar:panels#specifications|Vmp spec]] as close to your battery voltage as practical;((Vabs + 10% might be ideal.))  this will mean the panels will be running closer to their Vmp, and therefore closer to their rated output.
+Assuming a charging voltage of 14.2v, let's consider two different panels.  Remember that Vmp x Imp = Pmax (rated power).
+  * 100w panel, 20.0Vmp - 100W / 20Vmp = 5.0A Imp.  14.2v x 5A = **71W** max.
+  * 100w panel, 17.5Vmp - 100W / 17.5Vmp = 5.71A Imp.  14.2v x 5.71 = **81W** max.
+In this example, choosing the best-matched panel results in **14% increased harvest for free**. All it costs is attention and a few moments reading specs.

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