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$20,000 to $30,000 more than a die- sel, depending on specs,” explained Childers. “A propane bus is going to get 5 to 6 mpg, compared to 7 to 8 for a diesel, so you’re burning more fuel. But depending on your contract for propane, the propane bus can be very economical, with the added benefit of being a cleaner fuel [and reducing maintenance costs].” Lead technician Craig Long at


Dekalb Central Unified District in Indiana shared the details of a pro- posed propane set-up. “We should have had our propane in place by now,” said Long, who added that plans were put on hold due to COVID-19. “What we will have is an 18,000-gallon skid-mounted propane tank with dual dispensers on it.” With that large of a tank, he said the district can receive bulk loads of 8,500


Which of the following do you use to determine what fuel type is best for your operational needs?


49% Local suppliers 40% Geography/terrain


33% Reviewing data from other similar school districts


19% Other (maintenace and fuel costs, air quality,


mileage)


16% Weather (Out of 248 responses. Total does not equal 100. More than one answer possible.)


gallons, which saves money in the long run. The district had been using two 1,000-gallon tanks, which needed to be filled twice weekly. The fleet is currently at 66 buses total, with 56 propane, four gas buses for field trips, with the remainder being Type-A buses.


Charging Electric Buses The basic infrastructure component necessary for an electric fleet is the charging station, known as the Electric Vehicle Supply Equipment, or EVSE. It can be wall-mounted or sit on a con- crete pedestal surrounded by bollards. The plug can be AC (Level 2) or DC (Level 3). The difference between AC and DC charging is that AC provides between 7 to 24 kW, and DC offers 25 kW or more. The amount of power the battery on the bus holds is measured in kWh, kilowatt hours. It’s a matter of simple math to calculate


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