Wall-mounted Residential ESS Battery 5kwh

Product Overview

The YT-B5120WL2 Wall-Mounted Residential ESS Battery 5kWh is a user-centric energy storage solution designed specifically for residential and small-scale commercial applications. YTenergy’s expertise in sustainable energy technologies is reflected in every aspect of this product—from its durable LFP cells to its intuitive safety features—filling a critical niche for users who want high performance without sacrificing space or reliability.

A key advantage of the YT-B5120WL2 is its broad compatibility: it works seamlessly with both grid-tied and off-grid systems. For grid-tied homes, it stores surplus energy generated by solar panels during daylight hours, which can be deployed in the evening when electricity rates are highest (a strategy called “peak shaving”). This not only slashes monthly utility bills but also reduces reliance on fossil fuel-powered grid electricity. For off-grid users—such as those living in remote cabins or rural areas with unstable grid access—it provides a consistent power source, supported by its ability to operate in extreme temperatures: -20℃ to +60℃ for discharging and 0℃ to +55℃ for charging.

Sustainability is another cornerstone of the YT-B5120WL2. Its LFP chemistry is non-toxic, recyclable, and free of heavy metals, aligning with global environmental standards. The long 6000+ cycle life means fewer battery replacements over time, minimizing waste and lowering the total cost of ownership. Technical specs like 51.2V rated voltage and 2560W rated charging/discharging power ensure it can handle the energy demands of most modern households—from powering refrigerators and air conditioners to charging small electric devices.

Product Features

The YT-B5120WL2 stands out in the residential ESS market due to its innovative features, each addressing common pain points like short battery life, poor cold-weather performance, and safety concerns. Below is a detailed look at its standout capabilities:

6000+ Charge/Discharge Cycles for Long-Term Value

The YT-B5120WL2’s 6000+ charge/discharge cycle life (at 80% depth of discharge, DoD) is a defining feature that sets it apart from competitors. This longevity is made possible by high-quality LFP cells, which resist capacity fade caused by repeated charging and discharging. For homeowners, this translates to 10–15 years of reliable use (based on average daily cycling), eliminating the need to replace batteries every 3–5 years. This not only saves money on maintenance and replacements but also reduces the environmental impact of frequent battery disposal.

High Power Output for Demanding Daily Use

Equipped with a 50A rated charging/discharging current and 100A max charging/discharging current, the YT-B5120WL2 delivers consistent power to handle multiple household appliances simultaneously. Its 2560W rated power ensures no voltage drops—even when running energy-hungry devices like electric water heaters or air conditioners. For solar users, this high efficiency means faster charging: the battery can quickly absorb excess solar energy during peak sunlight hours, reducing waste and maximizing the use of renewable power.

Additionally, the YT-B5120WL2 supports parallel connection of up to 4 units, allowing users to expand total energy capacity to 20.48kWh (with 19.2kWh usable energy). This scalability is perfect for growing families, small businesses, or users who plan to add more solar panels in the future—no need to replace the entire system.

Built-In Heating Function for Cold-Climate Reliability

Many ESS batteries struggle in low temperatures, with reduced charging efficiency and discharge capacity. The YT-B5120WL2 solves this with an automatic heating function that activates when internal temperatures drop below 0℃. This ensures the battery maintains optimal performance even in harsh winter conditions—making it suitable for regions like northern Europe, Canada, and the northern U.S. The heating system uses minimal power (50–100W) and turns off once the battery reaches a safe operating temperature (5℃–10℃), so it never compromises usable energy capacity.

Multi-Layer Safety Systems for Peace of Mind

Safety is a top priority for YTenergy, and the YT-B5120WL2 is equipped with comprehensive protection mechanisms. At the heart of its safety features is a high-performance Battery Management System (BMS) that monitors voltage, current, temperature, and state of charge (SoC) in real time. The BMS prevents overcharging, over-discharging, short circuits, and overheating—all common causes of battery failure or safety hazards.

The battery also has an IP20 protection rating, making it dust-tight and protected against accidental contact with fingers or small objects—ideal for indoor installation in homes with children or pets. A built-in trip device adds an extra layer of safety by cutting off power in emergency situations. These features have earned the YT-B5120WL2 compliance with international standards, including UN38.3, IEC62619, and ROHS, ensuring it meets strict global safety and environmental requirements.

Applications

The YT-B5120WL2’s versatility makes it suitable for a wide range of scenarios, from residential homes to small commercial spaces and off-grid locations. Its compact design, high performance, and cold-weather adaptability ensure it excels in diverse environments:

Residential Energy Optimization

For homeowners, the YT-B5120WL2 is a powerful tool to take control of energy costs and reduce grid reliance. When paired with solar panels, it stores excess energy during the day and releases it at night or during peak electricity rate periods (known as time-of-use, TOU, pricing). This can lower monthly utility bills by 30% or more, depending on local electricity rates and solar production.

The battery also acts as a backup power source during grid outages, keeping critical appliances—such as refrigerators, medical equipment, and lighting—running. Its fast discharge capability means it activates immediately when the grid fails, providing peace of mind during storms or power disruptions. The wall-mounted design allows easy installation in garages, basements, or utility rooms, saving valuable living space.

Small-Scale Commercial Use

Small businesses like convenience stores, coffee shops, and home offices can benefit significantly from the YT-B5120WL2. These spaces have consistent energy needs (e.g., POS systems, refrigeration, lighting) and are often hit hard by peak-hour electricity surcharges. By storing energy during off-peak hours (when rates are low) and using it during peak times, businesses can cut energy expenses and improve profit margins.

The battery’s parallel connection capability is especially useful for growing businesses. As energy demands increase—for example, adding more refrigerators or expanding floor space—users can add up to 3 additional YT-B5120WL2 units to scale capacity. This eliminates the need for a full system upgrade, saving time and money.

Off-Grid and Remote Living

For users in remote areas without grid access—such as mountain cabins, rural farms, or off-grid vacation homes—the YT-B5120WL2 provides a reliable, low-maintenance energy solution. When paired with solar panels or a small wind turbine, it stores energy for use when renewable generation is low (e.g., at night or on cloudy days). Its cold-weather heating function ensures performance even in freezing temperatures, where other batteries might fail.

Unlike noisy, fuel-powered generators, the YT-B5120WL2 operates silently and produces no emissions, making it ideal for eco-friendly off-grid living. Its long 6000+ cycle life also reduces the need for frequent battery replacements—a critical advantage in remote areas where transportation and maintenance costs are high.

FAQ

To help you make an informed decision, we’ve answered the most common questions about the YT-B5120WL2 Wall-Mounted Residential ESS Battery 5kWh:

Is the YT-B5120WL2 compatible with my existing solar inverter?

Yes, the YT-B5120WL2 is designed to work with most standard solar inverters on the market. It supports CAN/RS485/RS232 communication protocols, which are widely used in residential solar systems to enable seamless communication between the battery and inverter. However, we recommend checking with your inverter manufacturer or a certified energy technician to confirm compatibility—especially if you have an older or specialized inverter model.

What’s the difference between “total energy” and “usable energy” for this battery?

The YT-B5120WL2 has 5.12kWh total energy (the full capacity of the battery cells) and 4.8kWh usable energy (the amount of energy you can safely use regularly). The difference exists to protect the battery from deep discharge, which accelerates capacity fade and shortens cycle life. The built-in BMS automatically stops discharging once the battery reaches a safe minimum SoC (typically 5–10%), ensuring you use energy without damaging the cells. This balance guarantees consistent performance while maximizing the battery’s lifespan.

Can I install the YT-B5120WL2 outdoors?

No, the YT-B5120WL2 has an IP20 protection rating, which means it is dust-tight but not waterproof or weather-resistant. Outdoor installation would expose it to rain, snow, or extreme temperatures beyond its operating range (-20℃ to +60℃ for discharging), which could damage the battery or create safety risks. We recommend indoor installation (e.g., garage, basement, utility room) or a fully enclosed, climate-controlled outdoor cabinet (if outdoor placement is necessary). Always have the battery installed by a certified electrician to comply with local electrical codes.

How much maintenance does the YT-B5120WL2 require?

One of the benefits of LFP batteries is their low maintenance needs, and the YT-B5120WL2 is no exception. Here’s what you need to do:

1. Visual inspections: Check for loose wires, dust buildup, or signs of damage (e.g., cracks, leaks) every 3–6 months.

2. Cleaning: Wipe the exterior with a dry cloth to remove dust—never use water, soap, or harsh chemicals, as these can damage the battery casing.

3. Performance monitoring: Use the battery’s communication ports (CAN/RS485/RS232) to track SoC, temperature, and cycle count via your energy management system. The BMS will alert you to issues like overheating or low SoC.

4. Temperature control: Avoid prolonged exposure to temperatures above 60℃ or below -20℃ to prevent accelerated degradation.

With proper care, the YT-B5120WL2 will maintain its performance for 10–15 years.

Does the heating function impact the battery’s usable energy?

The heating function uses minimal power (50–100W) when activated, which is negligible compared to the battery’s 4.8kWh usable energy. It only turns on when the battery’s internal temperature drops below 0℃ (to enable charging) and shuts off once the temperature reaches 5℃–10℃. This means the heating function does not significantly reduce the amount of energy available for your home or business—you’ll still have access to nearly all the battery’s usable capacity, even in cold weather.