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Standalone Solar PV system design Example

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This presentation explains an example of Standalone Solar PV system design for a household.

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Standalone Solar PV system design Example

  1. 1. Stand alone Solar PV System design Solar PV design Modules: Design of 1KW stand alone SPV system: Calculation of Load, Size of battery bank, Array Size, Distance between Modules in Array formation, Costing, Grid Interactive PV System: Export of PV power to grid, Grid Interactive Inverter, Islanding, reverse power flow, Surge protection, Wire sizes and voltage ratings, AC modules 31-08-2016 IEC-803 ENERGY BASICS BY DR N R KIDWAI, INTEGRAL UNIVERSITY 1
  2. 2. Stand Alone PV System Design A. Load Estimation 31-08-2016 IEC-803 ENERGY BASICS BY DR N R KIDWAI, INTEGRAL UNIVERSITY 2 A1 Inverter Efficiency 90% A2 Battery Bias Voltage 12 V Inverter AC Voltage 220 V Appliances Rating (Watt) Qty Net Rated Wattage Adjustment factor For dc 1, For ac A1 Adjusted Wattage Uses in Hours /day Energy /day (Wh) A4 A5 A6 = A4/A5 A7 A8=A6*A7 LED Bulb 7 5 35 0.9 38.9 4 155.6 Fans 70 3 210 0.9 233.3 8 1866.4 LED TV 60 1 60 0.9 66.7 8 533.6 refrigerator 45 1 45 0.9 50 8 400 Washing machine 500 1 500 0.9 555.6 0.5 277.8 Laptop 50 1 50 0.9 55.6 2 111.2 A11 Total AC power req. 890 W A12 Total DC power req.989 W A9 Total Energy demand per day 3244.6 Wh A10 Total amp-hour demand per day (A9/A2) 270.4 Ah
  3. 3. Stand Alone PV System Design B. Battery Sizing 31-08-2016 IEC-803 ENERGY BASICS BY DR N R KIDWAI, INTEGRAL UNIVERSITY 3 Location Lucknow Lattitude 26.80 N Design temperature 25 degrees C / 77 degrees F B1 Days of storage desired / required (autonomy) 3 B2 Allowable Depth of Discharge (DoD) limit 0.8 B3 Required battery Capacity (A10 x B1/B2) 1014 Ah B4 capacity of selected 12 V battery ( Exide FIP0-IP150..(150Ah) Price 10100) 150 Ah B5 Number of batteries in parallel (B3 / B4) 7 B6 Total battery amp-hour capacity (B5xB4) 1050 Ah B7 Total battery kilowatt-hour capacity (B6xA2/1000) 12.6 KWh B10 Average daily depth of discharge (.75xA10/B6) .19
  4. 4. Stand Alone PV System Design C. PV Array Sizing 31-08-2016 IEC-803 ENERGY BASICS BY DR N R KIDWAI, INTEGRAL UNIVERSITY 4 Design Tilt Lucknow (Latitude+100) 36.80 Design month: February C1 Total energy demand per day (A9) 3244.6 Wh C2 Battery round trip efficiency (0.70-0.85) 0.85 C3 Required array output per day (C1 / C2) 3817.2 Wh C4 Selected PV module max power voltage at STC (18x0.85) 15.3 V C5 Selected PV module guaranteed power output at STC 100 W C6 Peek sum hours at design tilt for design month 4.63 hours (Av PSH Lucknow =5.3 h) C7 Energy output per module per day (C5xC6) 463 Wh 530 Wh C8 Module output at operating temperature (DFxC7) 324.1 Wh 424 Wh DF=0.80 for hot climates. DF=0.90 for moderate climates C9 Number of modules req. to meet energy req. (C3 / C8) 12 modules 10 modules C13 Nominal rated PV module output 1200 W 1000 W MODEL: GS-STAR-100W
  5. 5. Stand Alone PV System Design D. Balance of Systems 31-08-2016 IEC-803 ENERGY BASICS BY DR N R KIDWAI, INTEGRAL UNIVERSITY 5 A voltage regulator (Charge Controller) is recommended unless array output current (at 1000 W/m2 conditions), less any continuous load current, is less than 5 % of the selected battery bank capacity (at the 8 hour discharge rate0). Wiring should be adequate to ensure that losses are less than 1% of the energy produced. In low voltage (i.e., less than 50 volts) systems, germanium or Schottky blocking diodes are preferred over silicon diodes. Fuses, fuse holders, switches, and other components should be selected to satisfy both voltage and current requirements. All battery series branches should contain fuses. Fused disconnects are strongly recommended to isolate the battery bank from the rest of the system. Refer to electrical and mechanical design sections for other considerations.
  6. 6. Grid Connected Rooftop PV System Design 31-08-2016 IEC-803 ENERGY BASICS BY DR N R KIDWAI, INTEGRAL UNIVERSITY 6 A voltage regulator (Charge Controller) is recommended unless array output current (at 1000 W/m2 conditions), less any continuous load current, is less than 5 % of the selected battery bank capacity (at the 8 hour discharge rate0). Wiring should be adequate to ensure that losses are less than 1% of the energy produced. In low voltage (i.e., less than 50 volts) systems, germanium or Schottky blocking diodes are preferred over silicon diodes. Fuses, fuse holders, switches, and other components should be selected to satisfy both voltage and current requirements. All battery series branches should contain fuses. Fused disconnects are strongly recommended to isolate the battery bank from the rest of the system. Inverter

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