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electrical:solar:charge_controller

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electrical:solar:charge_controller [2019/02/01 20:17]
frater_secessus [MPPT] 		electrical:solar:charge_controller [2019/07/21 12:23]
frater_secessus [PWM] heat is not dissipated. Switching causes it
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 [note from frater secessus: PWM vs. MPPT debates can get overheated in forums and comments. It's your money and your build so do it the way that meets your needs.] [note from frater secessus: PWM vs. MPPT debates can get overheated in forums and comments. It's your money and your build so do it the way that meets your needs.]
 ==== PWM ==== ==== PWM ====
-[[http://amzn.to/2hcZaj2|{{ https://images-na.ssl-images-amazon.com/images/I/41pwJOriZHL._AC_US160_.jpg}}]]**PWM** (pulse width modulation) controllers charge by connecting panels to battery until a given voltage setpoint is reached.  When the desired setpoint is reached the controller shuts current on/off to the battery in very fast cycles and in such a duration needed to keep voltage from rising. Excess power is given off as heat. This time slicing power delivery is called is pulse width modulation, or PWM.+[[http://amzn.to/2hcZaj2|{{ https://images-na.ssl-images-amazon.com/images/I/41pwJOriZHL._AC_US160_.jpg}}]]**PWM** (pulse width modulation) controllers charge by connecting panels to battery until a given voltage setpoint is reached.  When the desired setpoint is reached the controller switches current on/off to the battery in very fast cycles and in such a duration needed to keep voltage from rising.  This time slicing power delivery is called is pulse width modulation, or PWM.  Some heat will be generated by the switching. Counterintuitively, the PWM may be cooler the touch when it is running full open because there is no switching going on to limit voltage.
  
 [[http://www.electronics-tutorials.ws/blog/pulse-width-modulation.html|{{ http://www.electronics-tutorials.ws/articles/pwm2.gif }}]] [[http://www.electronics-tutorials.ws/blog/pulse-width-modulation.html|{{ http://www.electronics-tutorials.ws/articles/pwm2.gif }}]]
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 ==== shunt  ==== ==== shunt  ====
 [[http://amzn.to/2yQppTX|{{ https://images-na.ssl-images-amazon.com/images/I/41Gwyw0BT5L._AC_US160_.jpg}}]] [[http://amzn.to/2yQppTX|{{ https://images-na.ssl-images-amazon.com/images/I/41Gwyw0BT5L._AC_US160_.jpg}}]]
-Shunt controllers are very simple devices that charge to a given voltage [[electrical:solar:charge_controller_setpoints|setpoint]] (Vdisconnect) then stop charging.  If/when voltage falls to some lower voltage (Vreconnect) charging begins again.  This is sometimes called [[electrical:12v:charging#charge-and-stop|charge and stop charging]].+Shunt controllers are very simple devices that charge to a given voltage [[electrical:solar:charge_controller_setpoints|setpoint]] (Vdisconnect) then stop charging.  If/when voltage falls to some lower voltage (Vreconnect) charging begins again.  This is sometimes called [[electrical:12v:charging#charge-and-stop|charge and stop charging]] or on/off charging.
  
 > ...PWM [and] shunt controllers apply full panel voltage, or something close to it, across the battery terminals, at a duty cycle (fast for PWM, slow for shunt) that keeps the battery happy, and the controller monitors the battery voltage and then adjusts the PWM duty cycle accordingly, or in the case of a shunt, it clamps the panel output. -- Tx2Sturgis((http://www.cheaprvliving.com/forums/showthread.php?tid=29896&pid=373640#pid373640)) > ...PWM [and] shunt controllers apply full panel voltage, or something close to it, across the battery terminals, at a duty cycle (fast for PWM, slow for shunt) that keeps the battery happy, and the controller monitors the battery voltage and then adjusts the PWM duty cycle accordingly, or in the case of a shunt, it clamps the panel output. -- Tx2Sturgis((http://www.cheaprvliving.com/forums/showthread.php?tid=29896&pid=373640#pid373640))
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   * battery banks are cycled deeply on a regular basis so more time is spent in Bulk   * battery banks are cycled deeply on a regular basis so more time is spent in Bulk
-  * nominal 12v panels have a relatively high Vmp (>=18v)+  * nominal 12v panels have a relatively high Vmp (>=18v) for [[https://www.reddit.com/r/vandwellers/comments/bmlosu/is_vandwelling_a_frugal_lifestyle/emz5lsf/?context=1|reasons discussed here]].
   * [[https://www.wholesalesolar.com/solar-information/sun-hours-us-map|areas of low insolation]]   * [[https://www.wholesalesolar.com/solar-information/sun-hours-us-map|areas of low insolation]]
     * high latitudes     * high latitudes
electrical/solar/charge_controller.txt ยท Last modified: 2024/04/16 20:28 by frater_secessus

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