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electrical:solar:charge_controller

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electrical:solar:charge_controller [2020/06/30 09:43]
frater_secessus [Using LOAD output] 		electrical:solar:charge_controller [2020/08/15 21:26]
frater_secessus [MPPT]
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 [[http://amzn.to/2iD3WKf|{{ https://images-na.ssl-images-amazon.com/images/I/51bi9IjcsRL._AC_US160_.jpg}}]] [[http://amzn.to/2iD3WKf|{{ https://images-na.ssl-images-amazon.com/images/I/51bi9IjcsRL._AC_US160_.jpg}}]]
 **MPPT** (maximum power point tracking) controllers have two defining abilities: **MPPT** (maximum power point tracking) controllers have two defining abilities:
 +
   - discover (track) and utilize various power points along [[http://samlexsolar.com/learning-center/solar-panels-characteristics.aspx|the panel's power curve]].  Sometimes this is the maximum power point (MPP);  often in a 'dweller context the system needs less power and the controller runs the panels at some other power point.  It might be more accurate to call them PPT controllers.      - discover (track) and utilize various power points along [[http://samlexsolar.com/learning-center/solar-panels-characteristics.aspx|the panel's power curve]].  Sometimes this is the maximum power point (MPP);  often in a 'dweller context the system needs less power and the controller runs the panels at some other power point.  It might be more accurate to call them PPT controllers.   
-  - DC-DC downconvert excess voltage to amps+  - DC-DC downconvert excess voltage to amps - this is possible because MPPT decouples panel voltage (Vpanel) from charging voltage (Vbatt) 
 +   
 When maximum power is required((in Bulk or at other time when loads + charging >= panel output)) the controller will run the panels at Vmp (the maximum power point).   At other times the controller will find a less-than-maximum power point to match panel output to system needs. When maximum power is required((in Bulk or at other time when loads + charging >= panel output)) the controller will run the panels at Vmp (the maximum power point).   At other times the controller will find a less-than-maximum power point to match panel output to system needs.
 [[http://amzn.to/2yP01Ob|{{https://images-na.ssl-images-amazon.com/images/I/512x3hbc6jL._AC_US160_.jpg }}]] [[http://amzn.to/2yP01Ob|{{https://images-na.ssl-images-amazon.com/images/I/512x3hbc6jL._AC_US160_.jpg }}]]
-Since panel voltage at a given power point is usually too high for system needs((particularly with higher than nominal 12v panels )) the controller performs a DC-DC conversion to bring the voltage down to a directly usable level.  Because **current through a conductor is directly proportional to voltage**((https://en.wikipedia.org/wiki/Ohm%27s_law)) this downconversion effectively turns excess voltage into increased amps.(minus conversion losses).  + 
 +Since panel voltage at a given power point is usually too  
 +high for system needs((particularly with higher than nominal 12v panels )) the controller performs a DC-DC conversion to bring the voltage down to a directly usable level.  Because **current through a conductor is directly proportional to voltage**((https://en.wikipedia.org/wiki/Ohm%27s_law)) this downconversion effectively turns excess voltage into increased amps.(minus conversion losses).   
 This ability to decouple panel and bank voltage can result in 10%-30% more power harvested from 12v nominal panels than with a PWM controller.  Marketers like to call this "boost" or "gains" but it really just full capture of whatever power the panel[s] can provide under given conditions. This ability to decouple panel and bank voltage can result in 10%-30% more power harvested from 12v nominal panels than with a PWM controller.  Marketers like to call this "boost" or "gains" but it really just full capture of whatever power the panel[s] can provide under given conditions.
 +
 === "boost" effect === === "boost" effect ===
 {{ https://media.licdn.com/mpr/mpr/AAEAAQAAAAAAAAwtAAAAJGJhNjE1OGY3LTM3OWQtNGQ2Mi05NWEwLTI2Mzc3MGY3MDk3MA.png?150}}When compared apples-to-apples on identical systems with //only the controller being different//, the "boost" effect is most pronounced:   {{ https://media.licdn.com/mpr/mpr/AAEAAQAAAAAAAAwtAAAAJGJhNjE1OGY3LTM3OWQtNGQ2Mi05NWEwLTI2Mzc3MGY3MDk3MA.png?150}}When compared apples-to-apples on identical systems with //only the controller being different//, the "boost" effect is most pronounced:  
electrical/solar/charge_controller.txt · Last modified: 2024/04/16 20:28 by frater_secessus

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