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electrical:solar:mppt_design [2018/11/20 13:08]
frater_secessus created 		electrical:solar:mppt_design [2018/11/20 13:33]
frater_secessus [input voltage]
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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]].
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 +===== input voltage =====
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 +Input voltage is a balancing act between efficiency / heat reduction (requires lower input voltage), the ability to overcome self-consumption losses under all conditions (requires higher input voltage), wire size and length (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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   * Victron:  Vpanel >= Vbatt + 5v to start MPPT, Vbatt + 1v thereafter.((https://www.victronenergy.com/upload/documents/Manual-BlueSolar-charge-controller-MPPT-75-10-75-15--100-15-EN-NL-FR-DE-ES-SE-ul.pdf))   * Victron:  Vpanel >= Vbatt + 5v to start MPPT, Vbatt + 1v thereafter.((https://www.victronenergy.com/upload/documents/Manual-BlueSolar-charge-controller-MPPT-75-10-75-15--100-15-EN-NL-FR-DE-ES-SE-ul.pdf))
   * Genasun (nominal 12 systems):  15-18v for constant power supplies((https://genasun.com/support/faq/)), <= 27v for PV.((https://www.bruceschwab.com/wp-content/uploads/sites/86/2018/01/GV-10_Manual-2017.pdf))   * Genasun (nominal 12 systems):  15-18v for constant power supplies((https://genasun.com/support/faq/)), <= 27v for PV.((https://www.bruceschwab.com/wp-content/uploads/sites/86/2018/01/GV-10_Manual-2017.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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