Electric School Buses and Equity by Christiane Walker
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Christiane Walker, Engineering Consultant at The Center for Transportation and the Environment gave this presentation at the Forth Centering Equity and Resilience in School Bus Electrification webinar on November 09, 2021.
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Electric School Buses and Equity by Christiane Walker
- 1. Center for Transportation & the Environment ELECTRIC SCHOOL BUSES & EQUITY Christiane Walker E N G I N E E R I N G C O N S U L T A N T CenterforTransportation& the Environment November 9, 2021
- 2. About CTE W H O W E A R E 501(c)(3) nonprofit engineering and planning firm O U R M I S S I O N Improve the health of our climate and communities by bringing people together to develop and commercialize clean, efficient, and sustainable transportation technologies P O R T F O L I O $600+ million • Research, demonstration, deployment • 118 Active Projects totaling over $316 million O U R F O C U S Zero-EmissionTransportationTechnologies N A T I O N A L P R E S E N C E Atlanta, Berkeley, LosAngeles, St. Paul November 9, 2021 2
- 3. Our Four Service Areas STRATEGIC PROGRAMS ADDRESS PRIMARY BARRIERS FOR AZERO EMISSION FUTURE We supporttechnologyproviders’cuttingedge pilots. We supportearlyadopterswithtechnicalsolutions. We helpfleetoperators implementstrategicplans. We helporganizationsofallshapesandsizesstayaheadofthetechnologycurve. 3 November 9, 2021
- 4. CTE Projects 4 November 9, 2021 ESB Projects
- 5. Current ESB Projects • Albuquerque Public Schools – Transition Plan – Parking Lot Requirements • Stockton Unified School District – Deployment and Project Management – Transition Plan – Lowest Cost to Charge Case Study • Porterville Unified School District – Transition Plan – Deployment Assistance • Redwood City Schools – Technical Advisement – Deployment Assistance 5 November 9, 2021
- 6. Electric School Bus 101 6 November 9, 2021
- 7. Fuel-Fired vs Electric Buses 7 November 9, 2021 fuel+ O2 →CO2 + water + byproducts contained released LiC6 + CoO2 → C6 + LiCoO2 contained Fuel-Fired Battery Electric
- 8. Diesel vs. Electric – Understanding Units 8 November 9, 2021 Electricalenergyis measured in kilowatt-hours(kWh)and is the same idea as gallons of diesel.
- 9. Simple View ofBattery–“Nameplate Capacity” 9 November 9, 2021 200 kWh Assuming 1.7kWh/mi efficiency, a 200kWh battery can achieve 118 miles
- 10. Realistic View of NewBattery 10 November 9, 2021 160 kWh Reserved for Longevity Bus Won’t Move 5% 10% 5% Derated Performance Assuming 1.7kWh/mi efficiency, a NEW 200kWh battery can actually achieve 95 miles
- 11. Realistic Battery With 20% Degradation 11 November 9, 2021 80% 10% Bus Won’t Move 5% 5% Derated Performance 128 kWh 10% Reserved for Longevity Assuming 1.7kWh/mi efficiency, a degraded 200kWh battery can actually achieve 75 miles
- 12. Chargers -AC & DC AC Charging • DC conversion on the bus • Lower unit cost • Often 240VAC single phase • Power: 7 – 19 kW • Recharge Time*: ~22-8hr DC Charging • DC conversion off the bus • Higher unit cost • Often 480VAC 3 phase • Power: 50 – 150 kW • Recharge Time*: ~3-1hr November 9, 2021 12 * for the useable energy of a 200kWh battery
- 13. What is the power of a 80A AC charger to a bus? Comparing Diesel & Electric Charging Power November 9, 2021 13 VS. 70,000 kW 19 kW What is the power provided through a diesel nozzle to a bus?
- 14. Electric School Buses & Equity 14 November 9, 2021
- 15. Funding & Resources • Dedicate federal & local funding to: – school buses, – charging equipment, – infrastructure construction, – technical assistance, and – planning. • Make funding easily accessible. • Make a plan and prioritize equity-based funding. 15 November 9, 2021
- 16. Education • Schools, School Districts, and State Departments • Workforce – Driver & Maintenance – Planning & Operations • Children & Community 16 November 9, 2021
- 17. Questions? 17 November 9, 2021 Christiane Walker E N G I N E E R I N G C O N S U L T A N T christiane@cte.tv Need help? Have a question? Looking for an ESB partner? Contact our ESB Team esb@cte.tv
Editor's Notes
- Remove animations What was your favorite memory on a school bus? How would it have been better on and ESB? Group Questions: 1. Focus on school bus electrification : how do we make sure that the impacts of electrification are equitable? What are we doing now to avoid harm to communities? What projects are we centering on equity? 2. What are some challenges or concern/deterrent that we are seeing from communities from moving to electric? (CW is money; political will; ) 3. What can we all do to push this forward? (legislative engagement)
- Maybe get some equity/DAC stats for each of these places.
- Part of what we believe to be integral to equity is education and using each opportunity to ensure that we are all on the same, basic understanding of electrification.
- Where does energy come from to power vehicles? In these cases, it comes from chemical reactions that release energy. Fuel-fired engines’ reactions are 1x. Batteries chemical reactions can be reversed and reused. Fuel-fired engines emit byproducts that are harmful locally and are the leading contributor to climate change. This is why equity matters.
- 30 gallon/min *38 kWh/gallon * 60min/hr = 68,400 kW Charging takes time – but it’s unattended time