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--- electrical:solar:output [2020/05/17 19:43]
frater_secessus [panel tilt]
+++ electrical:solar:output [2020/07/17 14:37]
frater_secessus [insolation] lumens
@@ Line 10: / Line 10: @@
 ===== charge controller type =====
-Due to their design, [[electrical:solar:charge_controller#pwm|PWM]] and [[electrical:solar:charge_controller#shunt|shunt]] charge controllers will very rarely allow the panel to run at max output for given conditions.  The lower the battery voltage (Vbatt) the lower the panel voltage (Vpanel), therefore the lower the power output.((Vpanel * ~Imp = P))
+Due to their design, [[electrical:solar:charge_controller#pwm|PWM]] and [[electrical:solar:charge_controller#shunt|shunt]] charge controllers will very rarely allow the panel to run at max output for given conditions.  The lower the battery voltage (Vbatt) the lower the panel voltage (Vpanel), therefore the lower the power output.((Vpanel * ~Imp = P))  The output can be increased somewhat by [[electrical:solar:pwm_tweaking|tweaking battery voltages higher]].
 [[electrical:solar:charge_controller#mppt|MPPT]] controllers can run the panel at max output when needed, but are much more expensive.
@@ Line 57: / Line 57: @@
     * amount of atmosphere the rays have to penetrate (less at solar noon, more at other times or anytime sun is relatively lower on the horizon)
     * air quality:  \\ smoke((http://www.cheaprvliving.com/forums/showthread.php?tid=26592&pid=333826#pid333826)),((http://www.cheaprvliving.com/forums/showthread.php?pid=331627#pid331627))
+{{ http://img.mousetrap.net/misc/wattsunderconditions.jpg}}Based on [[https://en.wikipedia.org/wiki/Orders_of_magnitude_%28illuminance%29|lux measurements]], we can estimate how sky clarity/brightness affects the amount of power theoretically available to the panel.
+Takeaways:  overcast skies greatly reduce output, and there is no meaningful power available at sunrise/sunset.
@@ Line 111: / Line 123: @@
 **Optimum aiming** involves both tracking the suns elevation above the horizon (zenith) and tracking the sun's east-to-west travel (azimuth).  Doing both can increase yield ~30% but requires frequent repositioning.
-**Leaving panel tilt in a reasonable default** is more common and has milder yield improvments.  In this approach the panel is aimed at true((not magnetic)) south((in the northern hemisphere)) at a particular angle above the horizon depending on time of year and latitude.
+**Leaving panel tilt in a reasonable default** is more common and has milder yield improvments.  In this approach the panel is aimed at true((not magnetic)) south((in the northern hemisphere)) at a particular angle from perpendicular((ie, flat panel)) depending on time of year and latitude.
 Tilt angles calculated by [[https://www.solarpaneltilt.com/|solarpaneltilt.com]]:

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