Supply Case of Low-Voltage PV Reverse Power Protection Equipment in Sri Lanka | Solution for Self-Consumption PV Projects

Project Overview

This is a project case of low-voltage PV reverse power protection. It documents the complete cooperation process of supplying low-voltage PV reverse power protection equipment to a renewable energy EPC client in Sri Lanka. Custom-developed for grid-connected self-consumption photovoltaic projects, the device effectively prevents surplus solar power from feeding back to the public utility grid.

We can deliver matched protection solutions for PV projects with installed capacities from 21kVA to 1MVA, offering full-cycle services covering technical verification, formal quotation, standardized production, sea freight, remote commissioning and final project acceptance.

Company Profile

We are a professional supplier of electrical equipment and solution provider focusing on overseas new energy and power engineering projects. We support local EPC contractors, project owners and engineering teams in South Asian countries such as Sri Lanka with equipment selection and certified power protection devices. We consistently deliver cost-effective, grid-compliant electrical products adapted to site conditions, helping overseas PV projects pass grid inspection and achieve long-term stable grid connection.

Project Background & Technical Requirements

Client Requirements

The Sri Lankan client undertakes multiple commercial and industrial distributed self-consumption PV projects. Local grid codes strictly prohibit reverse power flow from PV systems to the public grid. Dedicated reverse power protection devices are required to realize real-time power monitoring and power control, ensuring 100% on-site consumption of solar power without back-feed to the utility grid.

Applicable PV Capacity Scope

The project covers mainstream distributed PV capacity specifications for commercial & industrial sectors in Sri Lanka. Our reverse power protection devices can stably match all capacity ranges with the following functions:

• Real-time monitoring of grid-connected active/reactive power, voltage and frequency;
• High-precision power flow detection to avoid reverse power injection into public grid;
• Supports reverse power protection and under-power protection; trips PV incoming switch once abnormal power flow is detected;
• Automatic reclosure of PV incoming switch after operating conditions recover;
• Built-in data logging and fault alarm for routine operation and maintenance inspection.

Inquiry Handling, Technical & Commercial Communication Process

Upon receiving inquiries, we adopt a standardized, transparent and efficient communication workflow to ensure accurate technical matching and standardized commercial terms, fully matching the procurement habits of overseas EPC projects.

Step 1: Product Screening & Submission of English Documentation

Based on the client’s PV capacity, self-consumption operation mode and local grid connection requirements, we select low-voltage PV reverse power protection equipment with stable performance, complete certifications and competitive cost. A full set of English technical datasheets, product manuals, certificates and parameter comparison documents are compiled and submitted to the client’s engineering team for preliminary evaluation.

Supplementary technical note: There are two mainstream solutions for PV anti-reverse power function. The first scheme trips the circuit breaker after detecting reverse/low power; the second scheme flexibly adjusts inverter output power. Considering site commissioning conditions of overseas projects, we prioritize the trip-type solution.

Step 2: In-depth Technical Communication & Parameter Confirmation

We conduct one-on-one technical discussion with the client’s site engineers to confirm key parameters including applicable voltage level, operating accuracy, response speed and communication protocols (sampling voltage: 400V, frequency: 50Hz, consistent with power standards in China).

Verification confirms the product fully complies with the anti-reverse power control logic specified by the client without technical adaptation risks. The equipment is easy to install and user-friendly for site technicians. Our technical team demonstrated equipment operation via remote video conference, and cross-checked parameters repeatedly with the client’s engineers to confirm the product meets project requirements.

Step 3: Formal Standard Quotation

After confirming the technical proposal, we issue formal international quotations with clear and complete terms, covering core concerns of overseas buyers:

Quotation Item	Standard Terms
Product Certification	CE, ISO 9001, compliant with IEC 61850 and IEC 62116 PV grid connection standards
MOQ	Small trial orders and bulk supply supported to meet tender requirements
Lead Time	Fixed production schedule for overseas orders to guarantee on-time delivery
Payment Terms	Flexible and secure international trade payment options
Warranty	Official long-term warranty + lifelong technical consultation service

Low-Voltage PV Reverse Power Protection Equipment Introduction

Developed exclusively for distributed self-consumption PV scenarios, this reverse power protection device solves the grid back-feed issue caused by mismatch between solar generation and on-site load demand. It serves as core grid-connected auxiliary equipment for commercial and industrial PV projects in Sri Lanka.

Core Functions

• Real-time Power Monitoring: Continuously collect grid-connected power, voltage, current and frequency with high precision to dynamically identify power flow direction;
• Trip-type Anti-Reverse Power Control: Relay trips upon detection of surplus power to achieve zero power back-feed to public grid. The relay closes to restore power supply of PV incoming circuit after reverse power disappears;
• Integrated Grid Fault Protection: Combines overvoltage, undervoltage, overfrequency, underfrequency and overload protection to guarantee safe grid connection of PV systems;
• Fault Logging & Alarm: Automatically store operation data and fault records, supporting remote access and on-site fault analysis.

Installation & Wiring Features

• Installation Options: Embedded mounting available; DIN rail mounting is optional upon project request, compatible with conventional low-voltage switchgears for Sri Lankan PV projects;
• Simple Wiring: Independent terminals for power supply, signal sampling and communication with clear marking to reduce wiring errors;
• Strong Environmental Adaptability: Wide operating temperature and humidity range, suitable for hot and humid tropical climate in Sri Lanka;
• Convenient Commissioning: Preloaded standard anti-reverse power parameters, supporting one-click parameter modification according to project operating conditions.

Standardized Overseas Production & Quality Control

Product reliability is the top priority for overseas clients. For new energy projects in Sri Lanka, we implement stricter quality control standards than domestic orders. Targeted factory tests are carried out for all units considering the tropical humid climate and local grid characteristics of Sri Lanka.

The whole production process includes component screening, high-low temperature aging test, power precision calibration, anti-interference test and simulated grid connection test. Each unit is verified item by item according to project capacity parameters before delivery to minimize on-site failure risks and satisfy acceptance standards of overseas projects.

Professional Export Packaging & Ocean Freight

Taking long-distance sea transportation and tropical humid environment of Sri Lanka into consideration, all equipment adopts export-grade moisture-proof, waterproof and shockproof packaging:

• Fully wrapped by waterproof & moisture-proof film to avoid damp damage during sea transit;
• Fixed with internal shockproof foam to prevent vibration and collision damage during transportation;
• Hard carton outer package reinforced with strapping belts to resist extrusion inside containers. We adopt standard container sea transport, complete formal export customs declaration and document filing, and provide full set of shipping documents and certification papers to ensure smooth customs clearance and intact delivery to project sites in Sri Lanka.

Remote Installation Guidance, Commissioning & Project Acceptance

After goods arrive on site, our professional new energy technical team provides free one-stop remote after-sales support for the Sri Lankan client.

We guide site engineers step by step to complete equipment installation, wiring inspection, parameter configuration, anti-reverse power logic commissioning and grid-connected simulation tests. During commissioning, zero back-feed performance is verified under various solar irradiance and load conditions to ensure sensitive response and accurate control.

Once all functions satisfy local grid specifications and project design indicators, we assist the client with on-site trial operation inspection and final project acceptance. Up to now, all operating equipment runs stably and fully meets long-term safe operation requirements of distributed self-consumption PV projects.

Customized Supply & Long-Term Cooperation

We provide long-term stable supply of low-voltage PV reverse power protection devices covering full capacity range of 21kVA–1MVA for distributed self-consumption PV projects. We serve EPC contractors, project owners and power engineering teams in Sri Lanka and other South Asian countries with stable supply, technical support and after-sales service.

Customized anti-reverse power protection solutions and cost-effective equipment support can be offered according to PV capacity, local grid codes and site operating conditions. All products hold complete CE and ISO certifications, applicable for global project tendering and grid connection approval.

Feel free to contact us for procurement of PV reverse power protection equipment, technical parameter matching and customized project solutions, to support stable grid connection of your distributed solar projects.