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electrical:solar:mppt_design [2018/11/20 13:32] frater_secessus |
electrical:solar:mppt_design [2021/07/19 23:09] frater_secessus [input voltage] |
===== input voltage ===== | ===== input voltage ===== |
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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). | 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). |
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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 controller; 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)) | * 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 | * EpEver: Vpanel >= Vbatt +2v to start MPPT.((https://www.epsolarpv.com/upload/cert/file/1811/Tracer-AN(50-100A)-SMS-EL-V1.1.pdf)) |
* 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)). | * generic rule of thumb: Vpanel >= maximum Vbatt + 30% |
| * generic rule of thumb: Vpanel <= maximum Vbatt * 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)). |
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