Standardizing Automotive Connectivity

Original Article ↗ Hacker News Discussion ↗

Scope of the Connector & “Standard” Framing

  • The LVCS connector is for internal low-voltage (48V) vehicle wiring, not charging; NACS/SAE J3400 covers charging.
  • Some argue this is not a true standard but a proposed de facto one, since no formal standards body was involved.
  • Others note many successful standards began as de facto implementations later formalized.
  • Concern: NACS tech docs were removed from Tesla’s site once SAE adopted J3400, now paywalled via SAE.

IP, Patent Pledge, and Adoption Concerns

  • Tesla’s “patent pledge” is seen by some as positive, others as coercive: using Tesla patents allegedly requires not asserting EV-related IP against Tesla or others.
  • Critics worry this could discourage companies from enforcing their own IP and centralize power with Tesla.
  • Some say for it to be a real standard, specs, test protocols, and conformance tooling must be fully open and accessible.

48V Architecture Rationale & Safety

  • 48V highlighted as “optimal” low-voltage level: ¼ the current for same power compared to 12V.
  • Justifications:
    • 48V stays under ~50V “low voltage” safety threshold, easing regulatory and electrocution concerns.
    • Long history of 48V(-ish) use in telecom, solar, and mild hybrids.
    • Enables thinner wiring and potential cost/weight savings, though some note there’s “no free lunch” in wire/insulation and mechanical robustness.
  • Discussion on why legacy automakers haven’t widely switched; explanations include supply-chain inertia and economics.

Ethernet vs CAN and Wiring Simplification

  • Enthusiasts say Ethernet plus 48V enables:
    • Zonal architectures and fewer, simpler harnesses.
    • Very high bandwidth for cameras, infotainment, and future driver-assist features.
    • Easier development using IP networking tools and paradigms.
  • Others point out:
    • CAN still dominates safety-critical systems; Cybertruck still has many CAN buses.
    • Real-time and safety separation often require multiple networks regardless of medium.
    • Some question the need for 10 Gbps but acknowledge camera-heavy systems can use it.

Connector Design, Keying, and Repairability

  • Color-coding (e.g., light blue for 48V, orange for high-voltage) is standard practice for safety.
  • Debate over using a single connector family:
    • Pro: Fewer types simplifies design and manufacturing; parallels drawn to motorsports converging on a few connector families.
    • Con: Risk of mis-plugging if keying isn’t robust; existing practice uses many mechanically distinct connectors so “if it fits, it’s right.”
  • Some argue 48V + Ethernet everywhere can make misplugs less catastrophic; others fear Tesla’s history on repairability means this may worsen independent repair and total cost of ownership.

Comparison to Existing Ecosystem & Tesla Perception

  • Several note existing automotive connectors (Deutsch, Weatherpack, MX, etc.) are mature and cheap; unclear what LVCS concretely improves beyond Tesla’s own cost targets.
  • Skeptical voices distrust Tesla’s engineering choices, ecosystem openness, and customer/industry relations; they are reluctant to adopt a Tesla-defined “standard.”
  • Supportive voices counter that committee-driven standards often yield clunky designs, while single-vendor initiatives can be more usable and arrive faster.