Unit 15 Dimensioning of a Solar/Battery Backup system Developed by: Alberto Escudero Pascual. IT+46.

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Presentation transcript:

Unit 15 Dimensioning of a Solar/Battery Backup system Developed by: Alberto Escudero Pascual. IT+46

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar Agenda What is dimensioning? User requirements and input data Solar dimensioning Battery dimensioning

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar What is dimensioning? What do I need to cover my needs in terms of electricity? ✔ How many solar panels? ✔ How many batteries? What voltage/current do I want to obtain? ✔ What is my load?

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar Location Based Data Sun peak hours/day ✔ Depending on your location ✔ Plan for the worst! Nigeria: 4 sun peak/day

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar User requirements Power consumption ✔ Total consumption of all electrical devices Anatomy ✔ How many days should the system work without power input?

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar Equipment specification Battery ✔ Capacity (Ah) ✔ Max discharge (%) ✔ Voltage (V) Solar Panels ✔ Nominal power (W)

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar Example Power Consumption (load): 120 W Battery ✔ Voltage: 12V ✔ Capacity: 100 Ah ✔ Max discharge: 50% How many batteries do we need?

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar How much current do we need? Power = Voltage * Current = V * I I = 120 / 12 = 10 A

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar How much energy do we need? In 1 day: Energy/day = 10 A * 24h = 240 Ah Energy/day = 12 V * 240 Ah = 2880 Wh In 5 days: 5 * 240 Ah = 1200 Ah

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar How much energy do we need? Assuming: Max discharge level: 50% Battery capacity: 100 Ah Total energy = 1200/ 0,5 = 2400 Ah No of batteries: 2400/100 = 24

TRICALCAR | - Version: February 2008www.wilac.net/tricalcar How many solar panels are needed? Assuming: 4 sun peak hours/day (4000 W/m 2) Panel current: 5 A Energy needed/day: 240 Ah Energy provided: 5 A * 4h = 20 Ah No panels: 240/20 = 12