在 TypeScript 中计算费用和节省金额

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长期来看,安装太阳能板还是继续照常支付电费更划算。

下面简要介绍了该代码如何确定太阳能板的费用。

第 1 部分:系统需求和设置

首先,定义您当前的电费用量和账单:

  • 您每月用电量是多少?(monthlyKwhEnergyConsumption
  • 电费是多少?(energyCostPerKwh

接下来,输入您的太阳能系统方案:

  • 有多少个面板?(panelsCount
  • 这些面板的功率如何?(panelCapacityWatts
  • 安装费用是多少?(installationCostPerWatt
  • 系统是否有折扣?(solarIncentives

第 2 部分:计算

该代码会根据输入的值计算:

  • yearlyProductionAcKwh:太阳能板每年可发电量。
  • totalCostWithSolar:使用太阳能板的多年电费。
  • totalCostWithoutSolar未安装太阳能板的多年电费。

第 3 部分:结果

代码还会告知您以下内容:

  • savings:安装太阳能板与未安装太阳能板的费用差异。
  • breakEvenYear:太阳能板的费用与节省的电费相等所需的年数。

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`);