HAND TOOLS USED AT ELECTRONICS WORK PRESENTED BY KOUSTAV SARKAR
Standalone Solar PV system design Example
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. 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. 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. 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. 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. 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