For factories, mines, and data centers, electricity is the true "lifeline" — a single unexpected outage can mean production line shutdown, data loss, equipment damage, and even order delivery failures.

Yet many mining sites, islands, remote plants, and overseas project sites either suffer from weak grid at the end of the line, or have no grid at all. The seemingly distant "outage anxiety" is actually a real cost that happens every day.

When reliable grid power is becoming harder to guarantee, a PV-ESS-Diesel hybrid microgrid system that supports seamless on/off-grid switching with diesel backup is becoming the "default answer" for high-reliability power supply.

Today, HEPUYU New Energy officially launches its new product — the HPY-PEDM-125kW/257kWh Grid/Off-Grid PV-ESS-Diesel Hybrid Microgrid System, making "no outage" a standard configuration.

1. What is a Grid/Off-Grid PV-ESS-Diesel Microgrid?

A complete grid/off-grid PV-ESS-Diesel microgrid is composed of three major systems working in coordination:

① PV System — PV modules, mounting structure, MPPT controller

② Energy Storage Cabinet — battery packs, BMS, EMS, PCS, STS

③ ATS — when a diesel generator is connected, an ATS cabinet is required

The system follows the multi-source coordination logic of "PV first → ESS peak shaving → grid supplement → diesel backup", supporting free switching between on-grid and off-grid modes. Even if the grid fails or there is no grid at all, the system can keep delivering stable power.

2. Five Hard-Core Highlights of This Product

2.1 Millisecond-Level On/Off-Grid Switching

Through the STS switch, the switching time is less than 20ms, ensuring no load interruption during off-grid switching — ideal for continuous production and critical equipment.

2.2 Long Cycle Life + High Safety

Adopting LFP 314Ah lithium iron phosphate cells, the cycle life reaches 8,000 cycles (0.5P, 25±2°C, @70% SOH); built-in 128-point temperature monitoring and aerosol fire protection deliver multi-level safety redundancy.

2.3 Outdoor Harsh Environment Adaptability

The whole unit features IP54 protection, working temperature -30°C to 55°C (auto-derating above 40°C), intelligent air cooling, and noise level below 70dB — ready for direct outdoor installation.

2.4 Intelligent Remote O&M

Supports 4G / WiFi / Ethernet (TCP/IP) multi-mode networking, paired with an LCD touch screen, enabling remote monitoring and O&M management of equipment status.

2.5 Full Set of Overseas Certifications

Already obtained the full set of qualifications including CE, UN38.3, MSDS, sea freight appraisal, road freight appraisal, and dangerous goods identification report, meeting the transport and on-site requirements of overseas projects.

3. Core Technical Specifications

Product Model: HPY-PEDM-125kW/257kWh

DC Battery Parameters

DC-Side PV Parameters

AC-Side Parameters (On-Grid)

AC-Side Parameters (Off-Grid)

On/Off-Grid Switching & Switch Configuration

System Parameters

Diesel Generator Access Parameters

4. Why Do You Need It?

A grid/off-grid PV-ESS-Diesel microgrid essentially installs a layer of "power insurance" for your load. Compared with a single grid or pure-PV solution, it solves several key problems:

• Weak grid at the end of the line, frequent outages — Off-grid mode takes over seamlessly, keeping production lines online.

• No grid or grid not yet covered — PV + ESS + diesel achieves self-sufficient independent power supply.

• High electricity prices, need for peak shaving — ESS charges at valley and discharges at peak, reducing energy costs.

• Heavy pollution and noise from diesel generators — PV priority + ESS makes the diesel "work less", saving fuel and being more eco-friendly.

Typical Application Scenarios

5. What Can HEPUYU Do for You?

HEPUYU New Energy specializes in distributed PV EPC, energy storage system integration, and PV-ESS-EV microgrid solutions. For this grid/off-grid PV-ESS-Diesel microgrid product, we provide one-stop services from project development to intelligent O&M:

① Project Development & Assessment — Site survey, load analysis, system capacity configuration

② Financing Solutions — Economic model and payback plan tailored to the scenario

③ Engineering Design — Electrical system, layout, and on/off-grid scheme design

④ Equipment Integration — PV-ESS-Diesel integration, commissioning, and acceptance

⑤ Intelligent O&M — Remote monitoring, data-driven management, fault diagnosis

↑ Insert image: MPPT-Controller-Schematic.png (PV MPPT Controller Schematic)

6. Take Action Now

If you are facing any of the following situations, we recommend launching an evaluation immediately:

• Plants with weak grid at the end of the line — Recommend conducting a power-supply stability and load analysis as soon as possible.

• Planning to deploy projects in off-grid / weak-grid areas — Recommend completing scheme customization within 3 months.

• Customers with diesel generators or overseas projects — Recommend reserving the diesel interface to achieve PV-ESS-Diesel integration.

Key Insight: The grid/off-grid PV-ESS-Diesel microgrid is no longer exclusive to large industrial parks. A standard 125kW/257kWh system alone is enough to free a factory, a mine, or an island from "outage anxiety" forever.

Make every kilowatt-hour stable and controllable.

About HEPUYU New Energy

HEPUYU New Energy has specialized in distributed PV EPC, liquid-cooling energy storage system integration, and PV-ESS-EV microgrid solutions for 18 years. With our self-developed 125kW/261kWh liquid-cooling energy storage unit, we have served dozens of scenarios including industrial plants, logistics parks, municipal facilities, commercial complexes, hospitals, and urban ultra-fast charging networks. Our full-chain services span project development, financing solutions, engineering design, equipment integration, and intelligent O&M.

[Official Website] www.bjhpy.com

Data Sources & Verification

This article is part of HEPUYU New Energy's [Product Promotion] section — Grid/Off-Grid PV-ESS-Diesel Microgrid System HPY-PEDM-125kW/257kWh New Product Launch.