Home energy storage system

I. Project Overview

This system is a high-performance integrated PV-storage-charging solution designed by UNIWEALTH for modern homes. Centered around an 11.2kWp PV system + 20kWh energy storage battery + 10kW three-phase inverter, it builds a home energy hub that integrates power generation, storage, consumption, and seamless on-grid/off-grid switching. The system is specifically designed for villas, large residences, and households with high electricity demand and a desire for energy independence, striving to achieve three major goals: high percentage of energy self-sufficiency, significant reduction in electricity costs, and safe and reliable emergency backup power.

II. System Composition & Technical Configuration

III. System Operation Modes & Intelligent Dispatch

1. Daily On-Grid Operation (Economic Mode)

• PV prioritizes powering household loads, with excess electricity stored in the battery;

• The battery charges during off-peak electricity rate periods and discharges during peak periods, achieving electricity cost savings;

• Supports “net metering” or “self-consumption with surplus feed-in” policies.

2. Off-Grid Emergency Mode (Safety Mode)

• Automatically switches to off-grid operation upon grid power failure, ensuring critical loads such as refrigerators, lighting, network equipment, and water pumps remain powered;

• Can support basic household electricity needs (approximately 3–5kW) for 4–6 hours continuously, with daytime PV recharging capability.

3. Intelligent Optimization Mode (AI Dispatch)

• The system learns household electricity usage habits and dynamically optimizes storage strategies based on weather forecasts;

• Supports integration with EV chargers and smart home devices, achieving whole-home energy coordination.

IV. Core Advantages & UNIWEALTH Value

✅ Safe & Reliable

• The LiFePO₄ battery has strong thermal stability, combined with three-level BMS protection, complying with UL 9540A safety standards;

• The inverter features multiple protections including anti-islanding, overload, and short circuit, ensuring long-term stable system operation.

✅ Efficient & Intelligent

• PV system conversion efficiency > 22%, maximizing rooftop resource utilization;

• The HEMS system makes the entire chain of generation, storage, and consumption visible, controllable, and optimizable.

✅ Flexible & Expandable

• The battery supports modular capacity expansion, allowing capacity to be increased as needed in the future;

• The system is V2H (Vehicle-to-Home) ready, supporting bidirectional charging/discharging with electric vehicles.

✅ Economical & Eco-Friendly

• Expected household electricity self-sufficiency rate of 70%–90%, with a payback period of approximately 5–7 years;

• Annual CO₂ emission reduction of approximately 8–10 tons, supporting household low-carbon transition.

V. Typical Application Scenarios

• Villas/Large Apartments: Achieve energy self-sufficiency and electricity cost independence;

• Areas with Frequent Power Outages: Provide uninterrupted power security;

• Electric Vehicle Households: Coordinate with home EV chargers to achieve a green power闭环 (closed loop) of “PV + storage + charging”;

• High Electricity Tariff Regions: Significantly reduce electricity costs through peak-valley arbitrage.

VI. Service & Guarantees

• One-Stop Service: Covers design, installation, grid-connection application, and O&M training;

• Cloud Platform Access: Supports remote monitoring, fault alerts, and energy efficiency analysis;

• Warranty Commitment: 25-year linear warranty for PV modules, 10-year warranty for the energy storage system.

VII. Project Significance

This solution is not only an upgrade to the home energy system but also a practical embodiment of UNIWEALTH’s mission to “Cool the Earth by 1°C” at the user level. Through technology integration and intelligent management, we enable every household to become a producer, storer, and intelligent user of green electricity, jointly driving the transformation of the energy structure and sustainable development.