EV charging: technical methods, case studies and policies

These technical resources and case studies outline Peninsula Clean Energy’s strategy to enable universal access to EV charging and is intended for transportation electrification program designers, regulators, and other public agency programs. The approach aligns infrastructure installed to drivers’ actual needs. This substantially reduces the high costs of EV charging projects, sometimes by an order of magnitude, enabling many more ports to be installed than with conventional strategies.

Matching charging capacity to everyday driver needs

All levels of charging have an important role to play. For long-dwell locations, the approach is to right-size charging levels based on average driving need.

Specifically, the average need is 25 – 35 miles per day for a typical urban and suburban resident.

For residential settings, cars are parked an average of over 12 hours. Charging needs can be satisfied with Level 1 (dedicated 120V 20-amp circuit, delivery up to 16 amps and 1.9 kW to the vehicle) or power-managed Level 2 (1.8+ kW) which provide 40 – 70+ miles of charge overnight, avoiding more expensive electrical capacity upgrades. Power-managed Level 2 systems can provide higher average charging but Level 1 provides lower cost.

Workplaces have somewhat shorter dwell times and managing charging at higher power levels may be appropriate.

Finally, fast charging (Level 3) provides essential support for long-distance trips, high utilization services such as ride-hailing, and some gap-filling support for those with no access to charging or whose periodic needs exceed their day-to-day charging option.

Principles

For residential, workplace, and long-dwell destination charging, the Peninsula Clean Energy program operates on the following principles:

  • Provide charging capacity to meet typical users’ daily needs within expected vehicle dwell times (minimum 1.9 kW for overnight charging)
  • Future-proof sites including:
    • Multifamily new construction: All residential units have electrified space
    • Existing construction: Maximize port count within available transformer capacity to avoid expensive distribution grid upgrades
  • Support Level 1 and load management 2.

Resources

Overview

Case Studies

Peninsula Clean Energy case studies

Other case studies

  • PowerFlex/23 and Me: ALMS workplace charging case study demonstrating a main panel oversubscription by over 6X.
  • NREL/PowerFlex Pilot: Demonstrating an electrical infrastructure cost avoidance of 50%.

Cost analysis

Technology

Local and state policy

Reports

Sections