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electrical:solar:mppt_design

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electrical:solar:mppt_design [2018/11/20 13:22]
frater_secessus 		electrical:solar:mppt_design [2018/11/20 13:32]
frater_secessus
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 There are benefits from using [[electrical:solar:panels#panel_voltage|higher voltage panels]] that can be realized when a system is designed for an MPPT controller.  An MPPT controller can also be the centerpiece of [[electrical:converter#diy_converters|a DIY converter]]. There are benefits from using [[electrical:solar:panels#panel_voltage|higher voltage panels]] that can be realized when a system is designed for an MPPT controller.  An MPPT controller can also be the centerpiece of [[electrical:converter#diy_converters|a DIY converter]].
 +
 +
 +===== input voltage =====
 +
 +Input voltage is a balancing act between absolute efficiency (requires lower input voltage), the ability to overcome self-consumption losses under all conditions (requires higher input voltage), wire size (higher input voltage), and shading mitigation (higher input voltage).
 +
  
 MPPT manufacturers always specify a maximum voltage coming into the panels;  some also specify a minimum or optimium voltage.    MPPT manufacturers always specify a maximum voltage coming into the panels;  some also specify a minimum or optimium voltage.   
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   * SNA (grid tied): Vpanel = desired output * 1.4142((https://www.researchgate.net/profile/Aalok_Bhatt/post/How_to_select_MPPT_Range_of_Solar_Inverter/attachment/59d624496cda7b8083a1f834/AS%3A377507284045824%401467016158673/download/SMA+Datasheet.pdf))   * SNA (grid tied): Vpanel = desired output * 1.4142((https://www.researchgate.net/profile/Aalok_Bhatt/post/How_to_select_MPPT_Range_of_Solar_Inverter/attachment/59d624496cda7b8083a1f834/AS%3A377507284045824%401467016158673/download/SMA+Datasheet.pdf))
   * generic rule of thumb:  Vpanel >= maxiumum Vbatt + 30%  FIXME   * generic rule of thumb:  Vpanel >= maxiumum Vbatt + 30%  FIXME
-  * generic rule of thumb:  Vpanel = maximum Vbat *  +  * generic rule of thumb:  Vpanel <= maximum Vbat * 2.((https://www.homepower.com/input-voltage-controller-efficiency))((https://forum.solar-electric.com/discussion/351037/recomended-mppt-input-voltage-for-a-48-volt-system)). 
- +
-MPPT controllers are most efficient when input voltage (Vpanel) is about 2x nominal battery voltage (Vbatt).  When Vpanel rises above 2x Vbatt more heat is generated when downconverting.((https://www.homepower.com/input-voltage-controller-efficiency))  At less than 2x the controller may not have enough "headroom" to work efficiently. +
  
electrical/solar/mppt_design.txt · Last modified: 2023/01/22 15:35 by frater_secessus

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