IEC Publishes Final CCS-Marine 350 kW DC Fast-Charge Standard — Unlocking Multi-Vendor Marina Networks

The IEC published IEC 63379-1 this morning, formally finalising the CCS-Marine DC fast-charge standard at power levels up to 350 kW. The specification governs the physical inlet, the CAN-bus negotiation layer, the safety interlocks for wet-environment use, and the metering/billing handshake that lets a boat from one builder draw power from a marina installed by another operator. The draft had been in stable circulation since mid-2024 — most early hardware shipped to the draft — but the published standard is what insurers, port authorities, and marina financiers have been waiting for before signing off on large-scale infrastructure spending.

Three changes between the late-2025 draft and the published version are worth noting. First, the maximum inlet contact temperature has been tightened from 90 °C to 75 °C, which simplifies cooling on the boat side but pushes more thermal load onto the charger cable. Second, the over-the-water galvanic-isolation requirements have been clarified — single-fault tolerance is now mandatory, double-fault tolerance recommended — which aligns CCS-Marine with the conservative end of IEC 60092 marine electrical practice. Third, the billing handshake now requires support for OCPP 2.0.1 by default, which means CCS-Marine chargers will interoperate with the same back-end systems that public road-vehicle networks already use.

For marina operators, the practical consequence is that the financing case for a 150–350 kW DC fast-charge installation is no longer blocked by the 'what if the standard changes' question. Aqua superPower, Power Dock, and Marina Power Solutions have all confirmed that pre-orders previously held pending the IEC publication will now move to firm commitments. For boat builders, the standard means that a CCS-Marine inlet is now a safe specification choice for a 2027 or 2028 model year — including the Hanse 460 electric default reported earlier this week, whose inlet is already CCS-Marine compliant.

For cruisers, the practical takeaway is simpler: marina DC fast charging is now a real, vendor-neutral utility that is about to roll out at scale. The two-year gap between 'we have a draft standard' and 'we have a published standard with insurer sign-off' was always going to be the binding constraint on infrastructure investment, and that gap has closed. The full text of IEC 63379-1 is available from the IEC web shop at standard pricing; an open-access summary document is being prepared by the Marine Electric Charging Alliance.