An Analogy: Charging Pile is the "Faucet," Energy Storage is the "Water Tank"
Imagine this scenario:
The Grid is the city water plant, providing stable supply but with pressure limitations
The Charging Pile is the faucet-turn it on and water gushes out, but water pressure might drop suddenly
The Energy Storage System is the rooftop water tank, storing water at night and releasing it during daytime peak usage
Solar PV is your own well, pumping water whenever the sun shines
For this system to operate efficiently, the core requirement is that the "faucet" and the "water tank" must stay in constant communication.
Conversation 1: When the Charging Pile Says "I Need Fast Charging," How Does Storage Respond?
When an electric vehicle fast charges, the power demand can easily reach 60kW, 120kW, or even higher. If multiple vehicles charge simultaneously, the impact on the grid is comparable to a small factory suddenly starting up.
This is where the energy storage system proves its value:
Scenario Simulation:
Charging Pile: "I'm about to start charging, need 120kW of power!"
Grid: "I can only give you 80kW, anything more will trip the breaker."
Energy Storage: "Don't worry, I've stored 50kWh-take it from me first!"
This is peak shaving and valley filling-the energy storage system charges when grid load is low (like late at night) and discharges during peak charging hours, satisfying EV owners' fast-charging needs while protecting the grid.
Chuhan Solution:
Wenzhou Chuhan's smart energy management system monitors charging pile load and energy storage status in real-time. When it detects that charging demand exceeds grid capacity, the system automatically dispatches storage to discharge-all completed within milliseconds, completely unnoticed by users.
Conversation 2: When Solar PV Says "I'm Generating Power," How Do Storage and Charging Respond?
At noon, when the sun is strongest, the solar PV system reaches peak generation. But if the charging station has few vehicles at that moment, where does all that electricity go?
Scenario Simulation:
Solar PV: "I'm generating 100kWh per hour right now, what should I do with the surplus?"
Energy Storage: "Store it with me! Use it tonight when more cars arrive."
Charging Pile: "Got it, I'll ask you for it when needed."
This is PV consumption optimization-using energy storage to save excess solar power generated during the day and shift it to evening peak hours. Without storage, surplus solar power would have to be fed into the grid at low value or even curtailed.
Chuhan Solution:
Wenzhou Chuhan's integrated PV-Storage-Charging system supports intelligent dispatch. The system predicts PV generation based on weather forecasts and combines this with historical charging data to automatically formulate storage charging/discharging strategies. Store more on sunny days, discharge less on cloudy days-maximizing the utilization of green power.
Conversation 3: When the Grid Says "I Need Frequency Regulation," How Does the Whole System Respond?
The grid is a system that must maintain constant balance-power generation and consumption must be equal in real-time. When grid frequency fluctuates, rapid response is needed.
Scenario Simulation:
Grid: "Frequency is dropping, need immediate power increase!"
Energy Storage: "I'm on it! I have the fastest response speed-can deliver in 50 milliseconds."
Charging Pile: "I can temporarily reduce charging power to assist with frequency regulation."
Solar PV: "I'm already at full generation, sorry can't help."
Energy storage systems are the champion players in grid frequency regulation, with response speeds far exceeding thermal or hydro power. Meanwhile, charging piles, through flexible power adjustment, can also participate in ancillary services and generate additional revenue.
Chuhan Solution:
Wenzhou Chuhan's energy storage systems feature primary frequency regulation capability, responding to grid dispatch commands. Simultaneously, our charging piles support flexible power adjustment, dynamically regulating charging power between 30%-100% based on grid needs-serving both EV owners and the grid.
At a Glance: How "PV-Storage-Charging" Works Together
| Time Period | Solar PV | Charging Demand | Storage Status | System Action |
|---|---|---|---|---|
| Early Morning (0-6am) | None | Low | Charging | Charge storage using low nighttime electricity rates |
| Morning (8-11am) | Increasing | Medium | Standby | PV prioritizes charging piles, surplus stored in storage |
| Noon (11am-1pm) | Peak | Medium | Charging | PV at full generation, surplus stored |
| Afternoon (2-5pm) | Decreasing | Increasing | Discharging | PV + storage jointly power charging piles |
| Evening (7-10pm) | None | Peak | Discharging | Storage releases daytime stored power to support fast charging |
| Late Night (10pm-12am) | None | Decreasing | Standby | Charging demand drops, storage prepares for overnight charging |
Why "Conversation" Capability Matters More Than Ever
Limited Grid Capacity: Many older neighborhoods and industrial parks lack sufficient distribution capacity-installing fast charging piles requires energy storage
Widening Price Gaps: When peak-valley electricity price differences exceed 0.7 RMB/kWh, storage becomes economically viable-PV-Storage-Charging can arbitrage the difference
Green Power Consumption Pressure: As PV penetration increases, grids impose stricter limits on feeding surplus power to the grid-self-consumption becomes the trend
Rapid EV Growth: Malaysia's EV sales doubled in 2025, charging demand surges, grid pressure intensifies
Chuhan's "Translator": The EMS Energy Management System
For charging piles and energy storage systems to communicate smoothly, a "translator" is needed-the EMS (Energy Management System) .
Wenzhou Chuhan's self-developed EMS system possesses the following capabilities:
Real-time Monitoring: Millisecond-level data collection from PV, storage, and charging piles
Smart Strategies: Automatically formulates operation strategies based on electricity prices, load conditions, and weather
Two-way Communication: Supports multiple protocols including Modbus, IEC 104, IEC 61850-interoperable with different brands
Cloud Collaboration: Real-time monitoring via mobile app, remote parameter adjustment
Simply put, EMS is the brain of the entire PV-Storage-Charging system, ensuring charging piles, storage, and PV each perform their roles in coordinated operation.
Conclusion: The future has already arrived, but the dialogue has just begun.
At the exhibition in Hong Kong, a Polish customer said after listening to our explanation: "So you are not just selling equipment, but selling a system that can think."
In fact, the future energy infrastructure is not composed of a series of independent devices, but an intelligent and coordinated system. The communication between charging stations and energy storage systems has just begun.
Having specialized in the new energy field for 15 years - from charging stations and energy storage equipment to inverters - Wenzhou Chuhan not only focuses on the hardware itself. We have built a "language bridge" between the hardware components. Ensuring that every kilowatt-hour of electricity reaches the correct place at the right time - this is what our work involves.
About Wenzhou Chuhan Technology CO,.LTD:
Founded 15 years ago, Wenzhou Chuhan Technology CO,.LTD focuses on the investment, construction, operation, and renovation of new energy, microgrids, and zero-carbon parks. The company professionally provides design solutions and services for DC-side products such as charging piles, energy storage systems, inverters, and photovoltaics, ensuring the success of power projects for partners both domestically and internationally. As a high-growth technology enterprise integrating R&D, manufacturing, and sales with smart electricity as its core business, Wenzhou Chuhan has obtained certifications including CCC, CB, TUV, KC, and SAA, with operations covering multiple fields such as new energy, photovoltaics, energy storage, and charging.
