I. Charging Strategy: Key Decision for Electric Heavy Truck Operation. With the increasing popularity of electric heavy trucks, the choice of charging method has become a key factor in the operation decisions of heavy truck fleets. Public charging stations and self-built charging stations are two common choices, and they differ in cost, efficiency, and flexibility. II. Cost Composition and Influencing Factors of Public Charging Stations. (I) Influencing factors: The cost of charging electric heavy trucks at public charging stations is affected by various factors, mainly including unit charging price, vehicle charging volume, and charging times. (II) Calculation of various costs: 1. Unit charging price: Market research shows that public charging station prices vary in different regions. In some areas, the average unit price is about 1 – 1.5 yuan/kWh. This article assumes it is 1.2 yuan/kWh. 2. Vehicle charging volume: The battery capacity of electric heavy trucks is usually large, commonly ranging from 282 to 350 kWh. Here, 300 kWh is used as an example. 3. Monthly charging volume per vehicle: Assume a truck travels 300 km daily, consumes 2 kWh/km, totaling 600 kWh/day. If it works 25 days/month, the total is 15,000 kWh/month. (III) Monthly total cost calculation: 15,000 x 1.2 = 18,000 yuan. III. Comprehensive Analysis of Self-built Charging Station Costs. (I) Influencing factors: Costs are affected by equipment, electricity, and O&M costs. (II) Calculation of various costs: 1. Equipment cost: Building a station for 10 trucks costs about 1.5 million yuan. 2. Electricity cost: Assumed average price is 0.6 yuan/kWh. With 7% charging loss, monthly cost per vehicle is 9,677 yuan. 3. O&M cost: Site fee + labor costs estimated at 12,000 yuan/month. IV. ROI and Advantage Analysis of Self-built Charging Stations. 1. Payback model: When the fleet size is 3 or more vehicles, the cost advantage is obvious. For a 10-truck fleet, the investment can theoretically be recovered within two years. 2. Other advantages: Flexible scheduling, higher efficiency, and potential policy support. V. Economic Advantage from a Long-term Perspective. Self-built stations usually achieve cost recovery within 5 to 6 years and are a more economically feasible choice for fleets with certain scale and high operation needs. VI. Leading the Green Revolution, Our Charging solutions empower fleets to achieve sustainable development.