在 TypeScript 中计算费用和节省金额

欧洲经济区 (EEA) 开发者

您可以使用 TypeScript 创建自己的计算。此页面底部的代码可帮助您确定从长远来看，安装太阳能电池板是否比继续按原样支付电费更划算。

以下是代码确定太阳能电池板成本方式的简要分解。

第 1 部分：系统需求和设置

首先，确定您当前的用电量和电费：

  • 您每月用多少电？（monthlyKwhEnergyConsumption）
  • 这些电费是多少？（energyCostPerKwh）

接下来，输入您的太阳能发电系统方案：

  • 有多少个面板？（panelsCount）
  • 面板的功率有多大？（panelCapacityWatts）
  • 安装费用是多少？（installationCostPerWatt）
  • 系统有折扣吗？（solarIncentives）

第 2 部分：计算

根据输入的值，该代码会计算：

  • yearlyProductionAcKwh：太阳能电池板每年可发电的总量。
  • totalCostWithSolar：安装太阳能电池板后，多年来的电费。
  • totalCostWithoutSolar：未安装太阳能板时多年的电费。

第 3 部分：结果

该代码还会告知您以下信息：

  • savings：安装太阳能板与未安装太阳能板的费用差额。
  • breakEvenYear：太阳能电池板的成本与节省的电费相当所需的年数。

示例代码

// 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`);
SolarPotentialSection.svelte

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