10KW photovoltaic energy storage power supply system project in the oil field area of ​​Malaysia

Customer Pain Points and Needs
1. Environmental Adaptability: The air in oilfield areas contains hydrogen sulfide (H₂S) and oil and gas volatiles, which accelerate metal corrosion and circuit aging.
2. Space Constraints: Oilfield facilities are cramped, and the equipment must be compactly integrated into the existing "PV House" (top power generation bottom equipment storage).
3. Safety Requirements: The equipment must eliminate the risk of electric sparks and meet Ex d IIB T4 explosion-proof standards (IP65 protection sealed enclosure required for non-explosion-proof areas).
4. Expansion Requirements: Space must be reserved for future PV system upgrades.

Solution: Customized service for three sets of 2-input, 2-output PV combiner boxes and 3-input, 3-output battery boxes.
1. Calculate current equipment voltage and current.

Input voltage per combiner box string: 34.82V * 5 = 174.1V. Input current per string: 9.62A. Output voltage per string: 174.1V. Output current per string: 9.62A
Battery box input voltage: 174.1V, input current: 9.62A x 2 = 19.24A

1. PV Combiner Box Product Configuration
Model: Longqi LQX-2/2DC1000V 2-input, 2-output enclosed plastic PV combiner box.
Core Configuration:
Electrical Performance: Rated current per circuit: 15A (designed for 1.25 times the string short-circuit current), using a 1000V DC 32mm fuse base (with room for expansion) and a 15A fuse element for overcurrent protection.
T2 Surge Protector: Equipped with a 20kA/40kA 1000V DC DC lightning protection module. This multi-stage lightning protection design offers a response time of ≤25ns. In the event of a lightning strike or surge, it rapidly discharges the surge current to ground, protecting the combiner box and subsequent equipment from damage. The lightning protection module features a degradation indicator, facilitating timely replacement. Output Configuration: 32A 1000V DC disconnect switch, leaving current and voltage headroom for future circuit expansion. It can completely disconnect the circuit during inspection or maintenance, effectively eliminating the risk of sparks. Its disconnection performance is superior to that of a circuit breaker.

Box Structure: PC ABS waterproof enclosed junction box, using MC4 connections, has passed the salt spray test for >720 hours without corrosion, IP65 protection rating, and UL94V-0 flame retardancy rating.

2. DC Battery Box Product Configuration
Model: Longqi LQT-3/3DC1000V 200AM1
Core Configuration:
LQM1 molded case circuit breaker: 200A DC 1000V molded case circuit breaker, providing short-circuit protection, overload protection, and switching functions. It also leaves room for future system upgrades.

Box Structure: Cold-rolled steel, has passed the salt spray test for >720 hours without corrosion, IP65 protection rating, and is sealed and explosion-proof.

Project Highlights

Excellent Environmental Adaptability: Core protection equipment (LQX-2/2 combiner box and 200A battery protection box) utilizes an IP65 high-protection design, perfectly meeting the extreme challenges of high temperature, high humidity, and high salt spray in oilfield areas.
High-Voltage Safety Design: The DC1000V system voltage level conforms to current photovoltaic system development trends, improving system efficiency while ensuring that equipment selection strictly meets high-voltage safety regulations.
Efficient Space Utilization: The integrated "PV House" design integrates power generation, equipment protection, and installation, making it particularly suitable for oilfield environments with limited space and strict environmental requirements.
Safety and Reliability: The combiner box and battery box feature multiple built-in electrical protections (overcurrent, short circuit, lightning protection, etc.), and the battery box provides physical isolation to ensure the safety of core system components.
Reduced Operating Costs: Utilizing free solar energy significantly reduces reliance on diesel generators, reducing fuel costs and generator maintenance expenses.
Environmentally Friendly: Zero-emission operation helps reduce the carbon footprint of oilfield operations.

Project Achievements
Energy Cost Savings: Utilizing solar energy significantly reduces daily electricity costs.
Improved Power Supply Reliability: The energy storage system ensures continuous operation of critical loads in the absence of sunlight or during grid failures, enhancing the operational stability of oilfield facilities.
Reduced Maintenance Costs: The PV energy storage system requires far less maintenance than diesel generators, and its protective equipment reduces the failure rate caused by environmental factors.
Enhanced Environmental Compliance and Image: The use of clean energy aligns with environmental trends and enhances the company's social responsibility image.
Trouble-free Operation in Harsh Environments: The protective solution, specifically designed for high-temperature, high-humidity, and salt-fog environments, ensures long-term, stable system operation, providing peace of mind for customers.