PV-ESS Diesel Hybrid Microgrid Solution For Off-Grid Oilfield & Remote Camp - News

Project Background

This case is implemented on an offshore oil & gas remote operating camp in Southeast Asia, a typical off-grid area without access to public utility power. The entire site previously relied entirely on diesel generator sets to power production equipment, monitoring instruments, pumping units and living facilities.

The load profile is complicated: constant base loads run round-the-clock, while frequent startup and shutdown of heavy machinery cause sharp load surges. Abundant solar irradiation on the island creates favorable conditions for building a photovoltaic + energy storage + diesel hybrid microgrid system. We adopted the AC-coupled topology and our liquid-cooled PCS energy storage cabinet to realize intelligent coordination of PV, battery storage and diesel gensets, cutting fuel costs and upgrading power supply stability.

Core Pain Points of Traditional Diesel-only Power Supply

Excessively High Fuel Cost & Low Generator Efficiency

In remote island and wilderness areas, diesel incurs huge expenses in cross-border transportation, storage and loss. Diesel generators perform poorly under light load and fluctuating load conditions, leading to incomplete fuel combustion and ultra-low energy efficiency. Fluctuating international oil prices further erode overall project profit margins.

Poor Power Quality Caused by Frequent Load Variation

Sudden load changes trigger slow response from diesel units, resulting in voltage flicker, frequency deviation and three-phase unbalance. Unstable power damages precision control instruments, electrical motors and automation systems, raising breakdown rates, maintenance fees and unplanned production downtime losses.

Low Automation & Insufficient Power Reliability

Conventional diesel systems require on-site manual operation for genset startup, shutdown and switching. In harsh weather such as heavy rains or strong winds, power interruption risks rise sharply, failing to meet the 24/7 uninterrupted power demand of field industrial operations.

Single Energy Structure with Weak Risk Resistance

Total dependence on diesel makes the site vulnerable to supply delays, transportation blockages and fuel shortages, which may directly suspend all on-site operations.

Overall Solution & Product Selection Principle

Selection Basis

We choose the 125kW/261kWh Liquid-Cooled PCS Energy Storage Cabinet as the core control unit and adopt the AC-coupled hybrid framework.

Liquid cooling design delivers superior heat dissipation, adapting to high temperature, high humidity and salt-spray corrosive offshore environment;

AC coupling is fully compatible with existing diesel generators without large-scale renovation of original power lines, shortening construction period and lowering on-site engineering cost.

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Detailed System Configuration & Technical Mechanism

1. Core Energy Storage Device: 1 set of 125kW/261kWh Liquid-Cooled PCS Cabinet

Rated AC power: 125kW bidirectional PCS converter; usable battery capacity: 261kWh lithium iron phosphate battery pack

Full liquid thermal management system, IP55 outdoor protection, wide operating temperature range from -20°C to 55°C

Integrated BMS, aerosol fire suppression system, local controller and circuit protection components

Technical function: The high-speed bidirectional PCS responds within milliseconds to smooth abrupt load fluctuations and intermittent PV output, stabilizes microgrid voltage and frequency, and acts as the grid-forming source under off-grid mode.

2. PV Power Generation System (AC-Coupled Access)

A 200kWp ground-mounted solar array with high-efficiency monocrystalline modules is deployed on open flat land. Solar inverters convert DC power to AC and connect to the common AC busbar of the microgrid.

Operating logic: On sunny days, photovoltaic power supplies onsite loads preferentially, and surplus electricity is charged into the liquid-cooled energy storage cabinet for later use.

3. Backup Power Source: Original Diesel Generator Sets

Existing diesel units are retained only as emergency backup power and fully controlled by the upper energy management system, avoiding continuous idling operation.

4. Central Control Unit: EMS Energy Management System

The EMS serves as the brain of the whole hybrid system, executing preset PV-ESS-diesel linkage strategies for fully automatic unattended operation.

Automated Control Logic of PV-ESS-Diesel Coordination

Energy Storage Priority Power Supply in Normal Conditions

Solar power directly feeds on-site loads during daytime. When PV generation drops or at night, the energy storage cabinet discharges to supply loads independently, keeping diesel generators in standby mode to eliminate fuel consumption.

Fluctuation Smoothing for PV Output & Dynamic Loads

The energy storage system rapidly absorbs excess power or supplements power gaps to offset cloud-caused PV volatility and motor startup impact, eliminating harmonic and voltage disturbance fundamentally.

Auto Start/Stop of Diesel Gensets Based on SOC Threshold

When battery SOC drops to the lower limit due to prolonged cloudy weather or heavy peak loads, EMS automatically activates diesel generators to co-supply loads and recharge the battery bank;

Once SOC rebounds to the upper threshold, the system shuts down diesel units intelligently and returns to PV & storage standalone operation.

Multi-layer Fault Redundancy Protection

In case of energy storage system faults, the microgrid seamlessly switches to diesel power supply; if gensets malfunction, the storage system provides instant backup to guarantee zero blackout for critical loads.

Project Benefits & Influences

1. Dramatically Reduce Fuel Consumption and Operational Expenditure

Diesel generator running hours are reduced by over 70%, with solar local consumption rate exceeding 90%. The overall fuel utilization efficiency of diesel units is lifted from less than 35% to above 85%. Annual energy and maintenance costs drop by more than 40%, greatly improving the profitability of remote industrial projects.

2. Optimize Power Quality and Extend Service Life of Equipment

Stable voltage and frequency output from the liquid-cooled energy storage system cuts the failure rate of precision devices and heavy motors by around 80%, minimizing downtime losses and recurring spare part replacement costs. Continuous and safe production is fully guaranteed.

3. Upgrade Unattended Intelligent Operation and Power Security

Full automatic scheduling via EMS removes the need for round-the-clock manual guarding. Dual backup of energy storage and diesel forms a robust redundant power architecture, strongly resisting extreme weather and sudden equipment anomalies for reliable 24/7 power supply.

4. Fulfill ESG Compliance and Green Low-Carbon Requirements

Maximized renewable solar energy penetration drastically lowers carbon emissions and exhaust pollution from diesel combustion. The solution helps overseas clients meet international ESG assessment standards, avoid carbon tariff penalties and enhance corporate environmental brand image in global markets.

5. Highly Replicable Standard Off-Grid Solution

The AC-coupled PV-ESS-diesel hybrid system features simple topology, strong compatibility and easy on-site deployment. It can be widely replicated for oilfields, open-pit mines, coastal islands, construction field camps and all other weak-grid or off-grid industrial scenarios.

Related Products

Liquid Cooling 125KW 261kWh Lithium Battery Energy Storage Cabinet

The IP55 Protected All-in-One Solar Energy Storage Cabinet is a high-performance, integrated energy solution engineered for outdoor commercial, industrial, and utility-scale solar applications. It integrates a 125kW Power Conversion System (PCS), a 261kWh lithium iron phosphate (LiFePO4) battery bank, an advanced liquid cooling system, and a intelligent Battery Management System (BMS) into a single cabinet with IP55 weatherproof protection. Designed to withstand harsh outdoor environments while delivering efficient energy conversion and storage, it supports solar energy absorption, peak shaving, load shifting, grid auxiliary services, and emergency backup power. Ideal for utility-scale solar farms, industrial parks, large commercial complexes, and remote microgrids, it provides a reliable, space-saving, and low-maintenance solution for large-scale renewable energy integration.