Case Study: Residential Solar-Storage-Charging Solution with 3–12kW Hybrid Energy Storage Inverters

Project Overview

Co-Bridge Energy delivered a customized solar-storage-charging solution for a 4-person household in Hangzhou, China. The family faced high peak electricity tariffs, occasional grid outages, and rising EV charging costs. With a daily load of 3–8kW and one electric vehicle, they required a flexible, reliable system to maximize green energy use and reduce reliance on the grid.

Solution Design

The system leverages Co-Bridge’s full line of residential energy products to build a closed-loop “generate-store-use-charge” ecosystem:

• Core Inverter: 6kW hybrid storage inverter (scalable from 3kW for small apartments to 12kW for large villas), supporting both on-grid and off-grid modes with millisecond-level seamless switching.
• Energy Storage: 8kWh LiFePO4 battery (expandable to 10kWh) to store excess solar power for peak-hour use or backup.
• EV Charging: 7kW AC home charger, configured to prioritize solar power for low-carbon, cost-effective EV charging.
• Solar Panels: 6kW rooftop PV array to feed clean energy into the system.

Key Advantages

1. Flexible Power Matching: The 3–12kW inverter range adapts to diverse household loads, from basic apartments to high-consumption villas.
2. Uninterrupted Power Supply: During grid outages, the system automatically switches to off-grid mode to power critical loads (refrigerators, lights, medical devices).
3. Smart Energy Optimization: The built-in EMS enables peak shaving, valley filling, and solar self-consumption maximization, reducing monthly electricity bills by 40%.
4. Certified Safety & Reliability: All components comply with IEC 62619, UL 1973, and CE standards, with overvoltage/overcurrent protection and 10+ year design life.
5. Eco-Friendly Mobility: The 7kW charger uses 90% solar power for EV charging, cutting annual carbon emissions by 2.3 tons.

Project Outcomes

• Economic Benefits: The family reduced monthly electricity costs by ¥300–¥400 through peak-valley arbitrage and self-consumption.
• Energy Independence: The system provides 24/7 backup power, eliminating disruptions from seasonal grid outages.
• Sustainability: The household achieved a 90% solar self-consumption rate, aligning with Co-Bridge’s “Bridge to Green World” mission to accelerate the transition to clean energy.