The document proposes installing solar photovoltaic systems at two bus stands in Coimbatore, India. It assesses the solar potential and estimated electricity loads at the sites. The Moffusil Bus Stand system would have a 26 kW capacity and the Town Bus Stand system 32 kW capacity. Cost estimates are provided for installing the systems, which would save money on electricity costs and reduce carbon emissions. Installation is recommended along with estimated payback periods and carbon credit benefits.

1. PROPOSAL
1. PROJECT TITLE:
Proposal on installation of SPV system for Moffusil & Town Bus Stand, Coimbatore.
2. OBJECTIVE:
To develop and formulate the proposal on SPV power plant for the Town Bus Stand.
3. LOCATION OF THE PROJECT:
Moffusil Bus Stand, Town Bus Stand,
Gandhipuram
Coimbatore.
4. SITE ASSESSMENT
Solar radiation potential of the region = 4.98 kWh/sq.m/day
Latitude of town bus stand =11° 0' 0" N
Longitude of town bus stand = 76° 58' 0" E
Latitude of moffusil bus stand = 11°30'0 " N
Longitude of moffusil bus stand = 70° 50'0 "E
Area for proposed power plant is the area available on the flat rooftop which is of 2200 sq.ft
for town bus stand & 2250 sq.ft for moffusil bus stand sufficient place is available for
installation of inverter & batteries
Roof Tops – yes
Flat Surface – yes
Orientation of the area – area facing south with no shadow effect
Tilt Angle – 11°

2. 5. ESTIMATION OF ELECTRIC LOAD:
Power usage pattern of the load -6 pm to 6 am
Power backup needed - 12 hours / full time
Capacity of the power plant - 26 kW (moffusilbus stand),32kW(town bus stand)
A. IN COIMBATORE MOFFUSIL BUS STAND
S.no NAME W Nos Total kW h/day kWh/day
1. Tubelights 28 90 2.52 12 30.24
2. Streetlight
(Sodium vapour)
250 26 6.5 12 78
Total 278 116 9.02 24 108.24
B. IN COIMBATORE TOWN BUS STAND
S.no NAME W Nos Total kW h/day
kWh/day
1. Tubelights 28 66 1.848 12 22.176
2. Havells lights 250 36 9 12 108
3. Other havells
(small LED’s)
6 62 0.372 12 4.464
Total 284 164 11.22 36 134.64
C. TOILETS
kWh per month=7522.56
S.no NAME W Nos Total kW h/day kWh/day
1. Bulbs 6 10 0.6 12 7.2
2. Tubelights 28 2 0.056 12 0.672
TOTAL (A+B+C) 20.896 250.752

3. DESIGN :
IN COIMBATORE MOFFUSIL BUS STAND
Inverter Efficiency = 93%
Total energy (kWh) Efficiency (%) Total Energy (kWh)
108.24 93 116.38
Inverter Capacity = 9.02 * 100/93
= 9.69 kW
Inverter Capacity = 10 kVA
Total system wattage (VA) System voltage (V) System current (A)
10000 12 834
10000 24 417
10000 48 209
SELECTION OF MPPT SYSTEM
Total Energy (Wh) Wattage (VA) Voltage (V) Maximum current (A)
116380 10000 192 53

4. BATTERY SIZE :
TOTAL ENERGY (Wh) SYSTEM VOLTAGE (V) Ah CAPACITY TO BE
SUPPLIED
116380 12 9698.33
REQUIRED CAPACITY (Ah) DOD (%) ACTUAL CAPACITY (Ah)
9698.33 50 19396.67
ACTUAL Ah CAPACITY
AFTER DOD (Ah)
NO.OF DAYS OF
AUTONOMY
FINAL REQUIRED
BATTERY CAPACITY (Ah)
19396.67 1 19396.67
Total no. of batteries = Total Ah capacity required/Ah capacity of one battery
= 19396.67/200
Total no. of batteries =97
MODULE SIZE:
TOTAL ENERGY(Wh) BATTERY EFFICIENCY (%) ENERGY FROM SPV
MODULE (Wh)
116380 90 129312
DAILY ENERGY TO BE
SUPLLIED BY SPV
MODULE (Wh)
EQUIVALENT DAILY
SUNSHINE HOURS (h)
SPV MODULE WATTAGE
(W/Wp)
129312 5 25863
Total no. of PV modules = Total estimated module power/Power of single module
= 25863/300
Total no. of PV modules = 86

5. COMPONENT NOS. CAPACITY
PV MODULES 86 300 Wp (each)
BATTERY 97 200 Ah (each)
INVERTER 1 10 KVA
IN COIMBATORE TOWN BUS STAND
INVERTER EFFICIENCY= 93%
TOTAL ENERGY (kWh) EFFICIENCY (%) TOTAL ENERGY (kWh)
134.64 93 144.74
Inverter Capacity = 11.22 * 100/93
= 12.06 kW
Inverter Capacity=12 kVA
TOTAL SYSTEM WATTAGE (VA) SYSTEM VOLTAGE (V) SYSTEM CURRENT (A)
12000 12 1000
12000 24 500
12000 48 250
SELECTION OF MPPT SYSTEM
TOTAL ENERGY (Wh) WATTAGE (VA) VOLTAGE (V) MAXIMUM CURRENT (A)
144740 12000 192 63
BATTERY SIZE :
TOTAL ENERGY (Wh) SYSTEM VOLTAGE (V) Ah CAPACITY TO BE
SUPPLIED
144740 12 12061.67

6. REQUIRED CAPACITY (Ah) DOD (%) ACTUAL CAPACITY (Ah)
12061.67 50 24123.33
ACTUAL Ah CAPACITY
AFTER DOD (Ah)
NO.OF DAYS OF
AUTONOMY
FINAL REQUIRED
BATTERY CAPACITY (Ah)
24123.33 1 24123.33
Total no. of batteries = Total Ah capacity required/Ah capacity of one battery
= 24123.33/200
Total no. of batteries = 121
MODULE SIZE:
TOTAL ENERGY(Wh) BATTERY EFFICIENCY (%) ENERGY FROM SPV
MODULE (Wh)
144740 90 160823
DAILY ENERGY TO BE
SUPLLIED BY SPV
MODULE (Wh)
EQUIVALENT DAILY
SUNSHINE HOURS (h)
SPV MODULE WATTAGE
(W/Wp)
160823 5 32165
Total no. of PV modules = Total estimated module power/Power of single module
= 32165/300
Total no. of PV modules = 107
COMPONENT NOS. CAPACITY
PV MODULES 107 300 Wp (each)
BATTERY 121 200 Ah (each)
INVERTER 1 12 KVA
6. TYPE OF SPV SYSTEM PROPOSED
 SPV system with battery bank
 Estimated power generation of installation is 4.5 units / KW /day of SPV System.

7. 7. COST ESTIMATION
Cost estimation of installing SPV system for town bus stand
COMPONENT CAPACITY COST/UNIT TOTAL COST
(Rs.)
SPV module 31500 W(300 Wp each) Rs.50/W 1575000
Battery 24200 Ah (200 Ah each) Rs.20000/No. 2420000
inverter 10KVA,192V Rs.150000/No. 150000
Installation Rs.5000/kW
system
160000
Mounting structures
+Transport charges
Rs.10 / W 320000
TOTAL COST 4625000
Total cost of project is 46.25 lakhs
MNRE subsidy available @ 30%
Total cost to be paid by Client is Thirty two lakhs thirty seven thousand five hundred
rupees (Rs.32,37,500)
Cost estimation of installing SPV system for moffusil bus stand
COMPONENT CAPACITY COST/UNIT TOTAL COST
(Rs.)
SPV module 26000 W(300 Wp each) Rs.50/W 1300000
Battery 19400 Ah (200 Ah each) Rs.20000/No. 1940000
inverter 10KVA,192V Rs.150000/No. 150000
Installation Rs.5000/kW
system
130000
Mounting structures
+Transport charges
Rs.10 / W 260000
TOTAL COST 3780000

8. Total cost of project is 37.80 lakhs
MNRE susbsidy available @ 30%
Total cost to be paid by Client is 26.46 lakhs (twenty six lakhs forty six thousand
rupees)
8. SITE LAYOUT
9. ESTIMATION OF CARBON EMISSION
1 unit of electricity produces 1.31 kg of carbon ,we can reduce about 3544.86 kg of carbon (3
carbon credits) emission from moffusil bus stand & can reduce about 4409.46 kg of carbon
(4 carbon credits) emission from town bus stand.
N
2200 sq.ft
2250 sq.ft

9. 10. RECOMMENDATIONS
Type of SPV system: stand alone with battery bank
Capacity of the system : 20 kW (moffusil bus stand),20 kW (town bus stand)
Mounting : Roof
11. CONCLUSION
Daily savings on Savings/day Amount saved
Electricity 251 units Rs.4,365
Payback periodwas calculatedto be 5.5 years
CER benefits 7 carbon credits = $ 20.93 (profit)