Domestic and Commercial Solar Payback Calculator
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AGHIJK
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Straton Solar
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www.solar.straton.org.za
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alan@straton.org.za
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Domestic Solar Panel Savings Calculation:
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Enter values into the Gray Shaded Boxes:
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System size:5kWh
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Purchase Price:114000*
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Estimated Electricity price increase:7.89%
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1st Years Electricity price:1.689per kWh
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Daily Sunlight Hours:5.5
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System Efficiency:0.8
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Units Sold On to tenant/s:150per month
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YearMunicipal price per kWhSavings per yearCumulative SavingsSales to tenants per annum
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11.68916,612.1616,612.163,040.20
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21.8217,922.8634,535.023,280.07
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31.9719,336.9753,871.993,538.87
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42.1220,862.6674,734.653,818.09
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52.2922,508.7297,243.374,119.33
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62.4724,284.66121,528.044,444.35
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72.6626,200.72147,728.764,795.01
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82.8728,267.96175,996.725,173.33
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93.1030,498.30206,495.025,581.51
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103.3532,904.62239,399.636,021.89
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113.6135,500.79274,900.426,497.02
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123.8938,301.80313,202.237,009.63
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134.2041,323.82354,526.047,562.69
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144.5344,584.26399,110.308,159.39
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154.8948,101.96447,212.278,803.17
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165.2851,897.21499,109.479,497.74
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175.6955,991.90555,101.3710,247.11
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186.1460,409.66615,511.0311,055.60
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196.6365,175.98680,687.0111,927.89
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207.1570,318.36751,005.3712,869.00
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217.7175,866.48826,871.8613,884.36
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228.3281,852.35908,724.2114,979.84
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238.9888,310.50997,034.7116,161.75
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249.6995,278.201,092,312.9017,436.91
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2510.45102,795.651,195,108.5518,812.69
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* Include all final costs such as Roof Engineers Report, Electricity COC, Net Meter installation and VAT
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Assumptions:
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1. We estimate the life of the system as being 25 years and RECOMMEND a daily average of 5.5 sunlight hours
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2. The Weather gurus say that Port Elizabeth receives a daily annual average of 7 hours 42 minutes of sunlight
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3. We recommend that you use a lifetime efficiency figure of 80%
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Commercial Solar Panel Savings Calculation:
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(This calculation takes depreciation and VAT into account)
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Enter values into the Gray Shaded Boxes:
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System size in kWh:5kWh
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System Purchase Price:100000
EXCLUDING VAT
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Estimated Electricity price increase:7.39%
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1st Years Electricity price:1.689per kWh
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Daily Sunlight Hours:5.5
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Starting System Efficiency:0.8per month
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Units Sold On to tenant/s:100per month
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YearMunicipal price per kWhSavings per yearCumulative SavingsDepreciation over 3 yearsSales to tenants per annum
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11.68965,598.7665,598.7650,000.002,026.80
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21.8146,751.51112,350.2730,000.002,176.58
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31.9537,989.44150,339.7120,000.002,337.43
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42.0919,318.86169,658.582,510.17
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52.2518,050.86187,709.442,695.67
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62.4119,384.82207,094.262,894.88
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72.5920,817.36227,911.613,108.81
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82.7822,355.76250,267.383,338.55
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92.9924,007.85274,275.233,585.27
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103.2125,782.03300,057.263,850.22
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113.4527,687.32327,744.584,134.75
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123.7029,733.42357,478.004,440.31
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133.9731,930.72389,408.724,768.45
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144.2734,290.40423,699.115,120.84
100
154.5836,824.46460,523.575,499.27
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