Sri Lanka 2000WUPS Modified Sine Wave Inverter Project Case

I. Client Background

Client Ronal is a prominent electrical appliance distributor in Sri Lanka, operating 10 physical stores and online sales channels. The company specializes in home appliances, emergency power supply equipment, and related categories. According to customer research: Affected by energy shortages, Sri Lanka will experience average daily power outages exceeding 6 hours starting in 2024. Businesses face spoiled refrigerated goods and cash register system failures due to blackouts, while households encounter issues like air conditioner shutdowns and lighting interruptions, driving a surge in demand for emergency power solutions. However, existing products in the local market suffer from two major pain points: First, imported UPS inverters are prohibitively expensive (priced above $400 each), making them unaffordable for ordinary consumers. Second, low-power inverters (below 1000W) cannot power high-wattage appliances like refrigerators and air conditioners. Core Customer Requirements: A 2000W-class modified sine wave UPS inverter priced under $75, supporting automatic grid/battery switching, compatible with 12V/24V batteries, tailored to Sri Lankan demographics, and capable of rapid delivery to meet market demand.

II. Collaboration Process

1. Requirement Alignment: The client contacted us through our Congxin official website, detailing local power outage durations, primary appliances (refrigerator 150W, air conditioner 1200W, computer 300W), and budget constraints. We provided a product proposal and quotation within 48 hours.
2. Product Customization: Optimize inverter output voltage parameters for Sri Lanka's 230V AC grid standard; add UPS emergency functionality enabling 0.08-second automatic switchover to battery power during grid outages; simplify control panels to align with local user habits; provide 100 sample units for initial testing.
3. Certification & Testing: Assisted client in completing certifications to ensure compliance with local safety standards; conducted 20-day load testing in commercial and residential settings to validate stability and switching response when simultaneously powering an air conditioner, refrigerator, and computer;
4. Bulk Production: Following successful testing, client placed initial order for 100 units; completed production and shipment within 10 days while collaborating on product manuals and promotional materials;
5. Ongoing Partnership: Post-launch, the product rapidly captured the local emergency power market due to its strong adaptability and high cost-effectiveness. The client maintains stable monthly replenishment orders of 800 units. We established a dedicated logistics channel ensuring delivery to Sri Lanka warehouses within 20 days, alongside providing a 1-year warranty.

III. Product Specifications & Technical Parameters

Core Functionality: Integrated UPS emergency power module charges batteries during grid operation and automatically switches to battery power during outages within <0.08 seconds, preventing equipment shutdowns.
Power Adaptability: Rated power 2000W, peak power 4000W. Simultaneously powers a 1.5-horsepower air conditioner (1200W), double-door refrigerator (150W), laptop (100W), and lighting equipment to meet diverse power demands.
Safety Protection: Features six-fold safeguards against overvoltage, undervoltage, overcurrent, short circuits, overtemperature, and reverse polarity. Built-in overload protection fuse automatically cuts power when device power exceeds rated capacity, safeguarding both the inverter and connected equipment.
High Adaptability: Supports 12V/24V DC wide-range input voltage, compatible with lead-acid and lithium battery packs. Outputs 230V AC ±5% at 50Hz ±1Hz, perfectly matching Sri Lanka's grid standards and mainstream appliances;
Technical Specifications: Conversion efficiency ≥90% (at full load), no-load loss <2W, operating temperature range -5°C to 50°C, net weight 5.2kg, dimensions 380mm×220mm×150mm, convenient for commercial and residential installation.

IV. Market Feedback and Customer Reviews

1. Sales and Usage Data

• Exceeded 500 units sold in the first month after launch, stabilizing at 800 units monthly after three months, capturing 30% of Sri Lanka's mid-power UPS inverter market share;
• Widely adopted across scenarios: 60% commercial users (convenience stores, small supermarkets), 30% residential users, and 10% small office environments;
• Customer repurchase rate reached 45%, with some commercial users making repeat purchases for branch expansions; over 20% of household users recommended the product to friends and family.

2. End-User Feedback (Translated from local customer reviews)

“Before, every power outage would melt the ice cream in my convenience store, causing huge losses. Since installing the 2000W UPS inverter, the air conditioner and refrigerator keep running during blackouts. No more worrying about inventory damage—and it's half the price of imported products!” — — Sam, Convenience Store Owner, Colombo
“With elderly family members and children at home, summer blackouts were unbearable. This inverter powers our AC and lights with lightning-fast switching—you barely notice the outage. We sleep soundly at night now. It’s so simple even seniors can operate it effortlessly.”— — Nisha, Home User
“Our office has 5 computers and 1 printer. Previously, power outages caused unsaved files to be lost. Now with this inverter, devices keep running during outages, so work efficiency isn't affected. It's extremely practical.” — Small Office User

3. Customer Collaboration Feedback

"Our partnership with this factory exceeded expectations! They not only quickly grasped our market needs and customized products to Sri Lankan standards but also strictly controlled costs, making the products highly competitive locally. Product quality is stable, with an after-sales defect rate below 5%, and replenishment is fast—perfectly meeting the surge in local demand. This 2000WUPS inverter has become our store’s core profit driver. We plan to collaborate on developing higher-power models to cover more scenarios." — — Customer Ronal

1. On-site installation of 2000WUPS in-store UPS at a Sri Lankan convenience store (powering refrigerator and cash register).

2. Product load testing data chart (showing stable voltage and current values while simultaneously driving AC unit + computer + lighting).