Upgrading the Supporting Supply Chain of HVAC Equipment: Value and Trends of Customized Direct Supply from Source Manufacturers

Against the general trend of global clean energy transition, distributed photovoltaics are gaining increasingly wide popularity. Policies including domestic rural photovoltaic promotion and county-wide PV rollout programs, as well as household photovoltaic demand in emerging overseas markets, have continuously diversified application scenarios for solar energy. For a long time, photovoltaic power generation has mainly relied on grid-connected power supply, which is confronted with practical challenges such as high grid-connection thresholds, expensive energy storage costs, and photovoltaic curtailment. How to consume photovoltaic power more efficiently at lower costs has become a shared exploration direction for the industry. The emergence of PV direct-driven hot water technology offers a cost-effective new approach for local consumption of distributed photovoltaic power and brings new development opportunities for clean energy hot water solutions.

Traditional photovoltaic hot water solutions are essentially a simple combination of "photovoltaic power generation + electric water heater". Direct current generated by PV panels must be converted into alternating current via an inverter before supplying power to the electric water heater. Energy storage batteries are additionally required to store surplus power for all-day hot water supply. Though logically feasible, this solution has obvious drawbacks in practical implementation. Firstly, the overall system cost is high. Inverters and energy storage batteries account for most of the total budget, unaffordable for many households and small commercial projects. Secondly, substantial energy loss occurs during DC-AC conversion as well as battery charging and discharging, reducing the utilization efficiency of photovoltaic power. Thirdly, maintenance is complicated. Inverters and storage batteries have limited service lives, bringing high replacement costs and relatively more potential failure points in later operation.

The core concept of PV direct-driven heating technology is "heat storage instead of electricity storage". It replaces electrochemical battery energy storage with thermal energy storage in hot water and eliminates the inverter to realize direct utilization of photovoltaic power. Specifically, the equipment can be directly connected to the direct current output from PV panels. A dedicated DC heating module converts electric energy into thermal energy to heat cold water inside the water tank without inverter conversion. Excess photovoltaic power is converted into hot water and stored in an insulated water tank to meet hot water demands at night or on cloudy days. This design fundamentally simplifies the system structure and greatly cuts the procurement cost of the entire PV hot water system, making it affordable and reliable for more users.

From the perspective of technical principles, PV direct-driven hot water systems possess prominent advantages. First of all, higher energy utilization efficiency. Removing the energy loss caused by the inversion process allows photovoltaic power to act directly on heating with fewer conversion links, significantly boosting energy efficiency. Secondly, lower system costs. Inverters and energy storage batteries are no longer necessary; the core equipment only consists of PV panels and direct-driven water heaters, which greatly reduces procurement and installation costs and shortens the return on investment cycle. Thirdly, simple operation and maintenance. Without complex electrical equipment, the complete unit boasts a mature and stable structure and barely requires extra maintenance in later stages, easy for ordinary users to operate. Fourthly, strong adaptability. It can operate independently matched with PV panels or connect to municipal power as a supplementary power source with automatic dual-energy switching to guarantee round-the-clock hot water supply.

Powerful scenario adaptability enables PV direct-driven hot water products to enjoy broad market prospects. For residential buildings, especially rural self-built houses and suburban villas, matching rooftop PV systems realizes zero-cost daily hot water, complying with clean energy policies and cutting household expenses. In commercial scenarios such as homestays, farm inns and small hotels with large hot water consumption, PV direct-driven hot water systems can drastically lower operating costs, while their eco-friendly feature serves as a business highlight. For collective water consumption sites including factory dormitories, schools and hospitals, large-capacity hot water storage tanks support mass production of domestic hot water with remarkable long-term economic benefits. In remote areas with unstable power grids and power-short overseas regions, PV direct-driven hot water systems can break reliance on power grids and provide stable hot water supply using solar energy, satisfying basic living demands in numerous regions.

Beyond domestic hot water supply, PV direct-driven heating technology can be extended to heating applications. Matched with heating terminals such as water floor heating and fan coil units, PV direct-driven heating systems deliver clean heating, especially suitable for regions with abundant sunlight and clear heating demands, acting as another premium clean heating solution. For overseas markets, many emerging countries have imperfect power grid infrastructure yet sufficient solar irradiance. Market demand for PV direct-driven hot water and heating equipment is rising rapidly, forming a new growth point within the HVAC export sector.

Nevertheless, as an innovative technology, the widespread adoption of PV direct-driven heating requires continuous technical iteration and market education. In the future, with steady improvements in photovoltaic module efficiency and continuous optimization of heating technology, the efficiency of PV direct-driven hot water systems will be further enhanced while costs keep declining. Meanwhile, integration with intelligent control technologies to realize automatic water temperature adjustment, adaptive photovoltaic power matching and remote control will continuously optimize user experience. From an industrial development perspective, PV direct-driven heating represents not merely technological innovation within the HVAC industry, but also an important practical application of clean energy. Guided by the long-term Dual Carbon Goals, this track is bound to embrace broader development prospects.