你可以使用 TypeScript 自行创建计算公式。本页底部的代码可帮助您确定从长远来看，安装太阳能电池板的费用更低，还是继续按原样支付电费。
下面将简要介绍代码如何确定太阳能电池板的成本。
第 1 部分：系统需求和设置
首先，定义您当前的用电和账单：
- 您每个月用多少电？(
monthlyKwhEnergyConsumption) - 这个电费是多少？(
energyCostPerKwh)
接下来，输入您的太阳系计划：
- 有多少个面板？(
panelsCount) - 面板的力量有多大？(
panelCapacityWatts) - 安装费用是多少？(
installationCostPerWatt) - 系统是否有折扣？(
solarIncentives)
第 2 部分：计算
根据输入的值，代码会计算：
yearlyProductionAcKwh：您的太阳能电池板每年可产生的总发电量。totalCostWithSolar：太阳能电池板多年来的电力成本。totalCostWithoutSolar：多年来不使用太阳能电池板的电力成本。
第 3 部分：结果
该代码还会告诉您以下内容：
savings：使用太阳能电池板和不使用太阳能电池板的成本之差。breakEvenYear：从太阳能电池板的费用节省下来的电量与节省的电量相等。
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`);