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electrical:solar:pwm_tweaking

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electrical:solar:pwm_tweaking [2022/10/12 13:36]
frater_secessus [PWM's achilles heel] 		electrical:solar:pwm_tweaking [2023/11/19 16:16]
frater_secessus [PWM's achilles heel]
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 17.8v x 5.6A = 99.68w <-- rating under laboratory conditions \\ 17.8v x 5.6A = 99.68w <-- rating under laboratory conditions \\
-17.8v x 5.6A = 94.70w <-- MPPT running at 95% efficiency \\+17.8v x 5.6A = 94.70w <-- MPPT running at 95% efficiency 
 + 
 +PWM harvest \\
 14.8v x 5.6A = 82.88w <-- power at a high Absorption voltage, as with flooded lead acid \\ 14.8v x 5.6A = 82.88w <-- power at a high Absorption voltage, as with flooded lead acid \\
 14.4v x 5.6A = 80.64w <-- power at a lower Absorption voltage \\ 14.4v x 5.6A = 80.64w <-- power at a lower Absorption voltage \\
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 12.7v x 5.6A = 70.61W <-- power at 100% state of charge (SoC) \\ 12.7v x 5.6A = 70.61W <-- power at 100% state of charge (SoC) \\
 12.4v x 5.6A = 69.44W <-- power at 75% state of charge; bulk charging \\ 12.4v x 5.6A = 69.44W <-- power at 75% state of charge; bulk charging \\
-12.1v x 5.6A = 67.76W <-- power at 50% state of charge;  bulk charging+12.1v x 5.6A = 67.76W <-- power at 50% state of charge;  bulk charging \\ 
 +10.0v x 5.6A = 56.00W <-- battery bank accidentally run flat 
  
 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.   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.  
electrical/solar/pwm_tweaking.txt · Last modified: 2023/11/19 16:18 by frater_secessus

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