A LCC Analysis for a domestic Roof-Top solar power system: 3KW SOLAR POWER SYSTEM - INVESTMENT, RETURNS, BREAKEVEN POINT & PAYBACK PERIOD ANALYSIS:\n \\n \\nINITIAL COSTS AND BENEFITS Annual, Rs. Depriciation Salvage Value Rs. At the end of 25 yrs. Bank loan interest @ 12% \\n Quantity Unit Cost Rs. Total Rs. \\nINITIAL SYSTEM COST: % Factor Amount \\nINDIESOL 230 watt solar panels 17 11,500.00 195,500.00 6,510.00 20% 39,100.00 \\nUnirac Top Mount Rail Kit 4 10,710.00 42,840.00 0% $0 \\nXantrex GT5.0 5000 watt inverter 1 35,000.00 35,000.00 0% 0.00 \\nXantrex 250 amp DC disconnect 1 12,000.00 12,000.00 0% 0.00 \\nAC Kilowatt Hour electric meter 1 4,800.00 4,800.00 0% 0.00 \\nBack up battery bank \\nCopper wire and combiner junction box 1 10,500.00 10,500.00 0% 0.00 \\nGrounding wire 1 4,500.00 4,500.00 0% 0.00 \\nTotal system cost 305,140.00 39,100.00 \\nVAT @5% 15,257.00 \\nSubtotal 320,397.00 \\n(Annual depriciation @3.33% per year, over next 30 years life for solar panels) \\nLabor 56 200.00 11,200.00 \\nInitial System Cost Total 331,597.00 \\nLess Government subsidy @30% 99,479.10 \\nLess Tamilnadu State rebate - - \\nSystem Cost after Basic Credits 232,117.90 \\nOther subsidy or Tax credit - \\nTotal 232,118.00 \\nAnnual Interest @ 10% on investment or 10% at bank loan rate for savings 23,212.00 for loans 23,212.00 \\n \\nANNUAL PRODUCTION \\nNumber of Panels 17 \\nSTC Rating in Watts Per Panel 230 \\nTotal watts per hour assuming optimum conditions 3,910 \\nPerformance under real world solar conditions 77% \\nAdjusted watts per hour assuming real conditions 3,010 \\nAverage hours of sunlight per day 5.5 \\nEstimated kilowatt hours per day output 16.56 \\n \\nEstimated kilowatt hours per year @300 sunny days per year 4,968 \\nTNEB Electricity unit rate as on 01-01-2012 (Rs.) 4.25 * \\nEstimated Income or annual saving on electricity in Rs. (Year 1) 21,114.00 \\nElectrical Rate Annual Inflation Assumed 10.0% * \\nGovernment Income Tax Bracket 20% \\n \\n REVENUES AND EXPENSES \\n 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037\\n Year 0 Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Year 11 Year 12 Year 13 Year 14 Year 15 Year 16 Year 17 Year 18 Year 19 Year 20 Year 21 Year 22 Year 23 Year 24 Year 25\\nInitial System Cost & Salvage Value -232,118.00 39,100.00\\nInterest on investment (receivable or payables) 0.00 \\nTotal accountable investment -232,118.00 \\nYearly return or savings on Electricity Bills or Sales 21,114.00 23,225.40 25,547.94 28,102.73 30,913.01 34,004.31 37,404.74 41,145.21 45,259.73 49,785.71 54,764.28 60,240.71 66,264.78 72,891.25 80,180.38 88,198.42 97,018.26 106,720.09 117,392.09 129,131.30 142,044.43 156,248.88 171,873.77 189,061.14 207,967.26\\nCumulative return year after year on Electricity Sales 21,114.00 44,339.40 69,887.34 97,990.07 128,903.08 162,907.39 200,312.13 241,457.34 286,717.08 336,502.78 391,267.06 451,507.77 517,772.54 590,663.80 670,844.18 759,042.60 856,060.86 962,780.94 1,080,173.04 1,209,304.34 1,351,348.77 1,507,597.65 1,679,471.42 1,868,532.56 2,076,499.81\\nBalance on Debt or Investment -232,118.00 -211,004.00 -210,990.40 -208,864.04 -204,202.50 -196,520.02 -185,259.02 -169,780.61 -149,353.93 -123,144.11 -90,198.79 -49,432.96 -388.02 71,862.02 151,939.47 247,313.80 360,243.60 493,286.22 649,334.93 831,660.51 1,043,957.87 1,290,398.09 1,575,686.78 1,905,129.22 2,284,703.28 2,721,140.87\\nInterest loss or interest payable on investment/loan (23,211.80) (23,421.58) (23,441.20) (23,230.52) (22,743.30) (21,926.33) (20,718.53) (19,049.91) (16,840.38) (13,998.45) (10,419.72) (5,985.27) (7,186.20) 15,193.95 24,731.38 36,024.36 49,328.62 64,933.49 83,166.05 104,395.79 129,039.81 157,568.68 190,512.92 228,470.33 272,114.09 \\nNet debt or credit -234,215.80 -234,411.98 -232,305.24 -227,433.03 -219,263.32 -207,185.35 -190,499.14 -168,403.84 -139,984.49 -104,197.24 -59,852.68 -5,597.24 79,048.22 167,133.42 272,045.18 396,267.96 542,614.84 714,268.42 914,826.57 1,148,353.66 1,419,437.90 1,733,255.45 2,095,642.14 2,513,173.61 2,993,254.95