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# Energy for telecommunications systems - Wimax Systems, Presentation - Dimensioning

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• ### Transcript

• 1. Unit 15 Dimensioning of a Solar/Battery Backup system Developed by: Alberto Escudero Pascual. IT+46
• 2. Agenda
• What is dimensioning?
• User requirements and input data
• Solar dimensioning
• Battery dimensioning
• 3. 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?
• 4. Location Based Data
• Sun peak hours/day
• Plan for the worst!
• Nigeria: 4 sun peak/day
• 5. User requirements
• Power consumption
• Total consumption of all electrical devices
• Anatomy
• How many days should the system work without power input?
• 6. Equipment specification
• Battery
• Capacity (Ah)
• Max discharge (%)
• Voltage (V)
• Solar Panels
• Nominal power (W)
• 7. Example
• Power Consumption (load): 120 W
• Battery
• Voltage: 12V
• Capacity: 100 Ah
• Max discharge: 50%
• How many batteries do we need?
• 8. How much current do we need?
• Power = Voltage * Current = V * I
• I = 120 / 12 = 10 A
• 9. 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
• 10. 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
• 11. 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