您可以使用 TypeScript 自行建立計算。從本頁底部的程式碼,您可以判斷安裝太陽能板的長期是否更便宜,以及繼續依原樣支付電費。
以下是程式碼決定太陽能板費用方式的概略資訊。
第 1 部分:系統需求和設定
首先,定義目前的用電量和帳單:
- 你每月使用多少電力?(
monthlyKwhEnergyConsumption
) - 那麼這件電要多少錢?(
energyCostPerKwh
)
接著,請輸入您的太陽能系統計畫:
- 有多少面板?(
panelsCount
) - 面板有多強大?(
panelCapacityWatts
) - 安裝費用是多少?(
installationCostPerWatt
) - 系統中是否有任何折扣?(
solarIncentives
)
第 2 部分:計算
程式碼會根據輸入的值計算:
yearlyProductionAcKwh
:太陽能板可產生的年度總電力。totalCostWithSolar
:「含」太陽能板多年的電力費用。totalCostWithoutSolar
:多年來不含太陽能板的電力費用。
第 3 部分:結果
程式碼也會顯示下列資訊:
savings
:太陽能板的票價差異。breakEvenYear
:至於太陽能板成本等於電力節省的年數。
程式碼範例
// Solar configuration, from buildingInsights.solarPotential.solarPanelConfigs let panelsCount = 20; let yearlyEnergyDcKwh = 12000; // Basic settings let monthlyAverageEnergyBill: number = 300; let energyCostPerKwh = 0.31; let panelCapacityWatts = 400; let solarIncentives: number = 7000; let installationCostPerWatt: number = 4.0; let installationLifeSpan: number = 20; // Advanced settings let dcToAcDerate = 0.85; let efficiencyDepreciationFactor = 0.995; let costIncreaseFactor = 1.022; let discountRate = 1.04; // Solar installation let installationSizeKw: number = (panelsCount * panelCapacityWatts) / 1000; let installationCostTotal: number = installationCostPerWatt * installationSizeKw * 1000; // Energy consumption let monthlyKwhEnergyConsumption: number = monthlyAverageEnergyBill / energyCostPerKwh; let yearlyKwhEnergyConsumption: number = monthlyKwhEnergyConsumption * 12; // Energy produced for installation life span let initialAcKwhPerYear: number = yearlyEnergyDcKwh * dcToAcDerate; let yearlyProductionAcKwh: number[] = [...Array(installationLifeSpan).keys()].map( (year) => initialAcKwhPerYear * efficiencyDepreciationFactor ** year, ); // Cost with solar for installation life span let yearlyUtilityBillEstimates: number[] = yearlyProductionAcKwh.map( (yearlyKwhEnergyProduced, year) => { const billEnergyKwh = yearlyKwhEnergyConsumption - yearlyKwhEnergyProduced; const billEstimate = (billEnergyKwh * energyCostPerKwh * costIncreaseFactor ** year) / discountRate ** year; return Math.max(billEstimate, 0); // bill cannot be negative }, ); let remainingLifetimeUtilityBill: number = yearlyUtilityBillEstimates.reduce((x, y) => x + y, 0); let totalCostWithSolar: number = installationCostTotal + remainingLifetimeUtilityBill - solarIncentives; console.log(`Cost with solar: $${totalCostWithSolar.toFixed(2)}`); // Cost without solar for installation life span let yearlyCostWithoutSolar: number[] = [...Array(installationLifeSpan).keys()].map( (year) => (monthlyAverageEnergyBill * 12 * costIncreaseFactor ** year) / discountRate ** year, ); let totalCostWithoutSolar: number = yearlyCostWithoutSolar.reduce((x, y) => x + y, 0); console.log(`Cost without solar: $${totalCostWithoutSolar.toFixed(2)}`); // Savings with solar for installation life span let savings: number = totalCostWithoutSolar - totalCostWithSolar; console.log(`Savings: $${savings.toFixed(2)} in ${installationLifeSpan} years`);