DC Fast Chargers vs Level 2 Chargers
DC fast chargers and Level 2 chargers show distinct reliability patterns, with operational challenges differing between the two technologies. Here’s a detailed comparison:
Failure Rates and Functional Status
- DC Fast Chargers: Studies indicate ~70-72.5% functional status in real-world tests, with 22.5% of units changing operational state (functional to non-functional or vice versa) over an 8-day period. NEVI guidelines now require 97% annual uptime for federally funded chargers, focusing on hardware/software availability and power delivery.
- Level 2 Chargers: While explicit failure rates aren’t quantified in the data, >33% of sessions at unspecified charger types (likely including Level 2) deliver lower-than-expected power, though Level 2 users are less impacted by slow charging due to longer dwell times.
Operational Challenges
- DC Fast Chargers: Face complex power management issues (e.g., dual-port stations delivering <17.5 kW/port when power-sharing) and component stress from high-power demands.
- Level 2 Chargers: Experience fewer “abnormal stop codes” (none reported in the cited data) but suffer software-reporting inaccuracies that misrepresent charger status.
User Experience
- DC Fast Chargers: Failures cause acute inconvenience due to drivers’ reliance on quick charging during trips.
- Level 2 Chargers: Lower-speed issues are less disruptive for users charging overnight or during extended stops.
Emerging Solutions
New DC fast charger designs like Pii’s 60-kW models use components with 1M+ hour MTBF ratings, emphasizing modularity and simplified maintenance. The NEVI uptime requirements aim to address systemic reliability gaps. Both charger types suffer from data accuracy issues, where software systems misreport operational status.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-does-the-reliability-of-dc-fast-chargers-compare-to-level-2-chargers/
