Differences

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--- electrical:solar:pwm_tweaking [2018/04/18 16:50]
frater_secessus [Tweaking a PWM controller for maximum power]
+++ electrical:solar:pwm_tweaking [2018/04/18 16:52]
frater_secessus [the controller's achilles heel]
@@ Line 26: / Line 26: @@
 .1v x 5.6A = 67.76W <-- power at 50% state of charge;  bulk charging
-This last number shows how far off PWM output can fall when battery voltage is at its lowest.((The last number is also the source of the "30% boost!!!" claims some MPPT makers make.  Yes, at that point MPPT at 94.69w (after 5% MPPT efficiency penalty) is 40.2% more than PWM's 67.76w but that is when the disparity is the widest.  Most of the time the MPPT charging advantage is lower, perhaps 15%.))  It's also when the battery needs the most current to get out of that deep cycle trough.
+This last number shows how far off PWM output can fall when battery voltage (Vbatt) is at its lowest.((The last number is also the source of the "30% boost!!!" claims some MPPT makers make.  Yes, at that point MPPT at 94.69w (after 5% MPPT efficiency penalty) is 40.2% more than PWM's 67.76w but that is when the disparity is the widest.  Most of the time the MPPT charging advantage is lower, perhaps 15%.))  It's also when the battery needs the most current to get out of that deep cycle trough.
 ===== the plan =====

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