Marine unmanned equipment is accelerating towards regular operations. From underwater pipeline inspection to offshore wind farm maintenance, from port security to marine research, the deployment of AUVs and ROVs is increasing year by year. But a fundamental problem has never been well solved: How do they recharge?

The traditional method is simple - at the end of the operation, they are retrieved and brought ashore, and then manually plugged and unplugged for charging. One complete cycle takes several hours of underwater operation, but the recovery and charging take more than half a day. What's more troublesome is that the charging interfaces of underwater robots are constantly immersed in seawater, leading to corrosion, biological adhesion, and plug-and-unplug wear, which are all frequent failure points.

Underwater wireless charging is precisely targeting these pain points. The principle is not complex - it is similar to industrial wireless charging: through magnetic coupling resonance, non-contact energy transfer is completed underwater. The robot only needs to dock at the underwater charging station and does not require mechanical docking to replenish energy. The industry is still in the early stage of commercialization, with approximately 70 sets delivered globally in 2025, with an average unit price of about 650,000 US dollars, mainly based on project-based and customized verification. The core technical challenges include eddy current losses caused by seawater conductivity, alignment deviations caused by ocean currents, and the impact of deep-water pressure on magnetic performance, etc.

WIRELESSPT, as an industrial-grade wireless charging solution provider, has product power coverage from 10W to 30kW, and has mature technical accumulation in waterproof sealing, magnetic coupling resonance, etc. The underwater wireless charging solution for this scenario essentially extends the "non-contact, maintenance-free, and high protection" logic of industrial wireless charging to the underwater environment. The specific adaptation needs to be evaluated based on equipment power, water depth, communication requirements, etc.

The journey from "research and verification" to "engineering deployment" of underwater wireless charging still has a long way to go. But the direction is clear: when unmanned equipment truly goes for long-term residence, charging will no longer be able to rely entirely on "coming ashore".