With the development and progress of the times, the world's science and technology have become more and more powerful, but we are still not immune to the damage caused by natural disasters to people's lives. If you live where natural disasters cause frequent power outages, you may want to consider installing a bank of home energy storage batteries to provide you with power when the grid is down. These battery backup systems can be composed of lead-acid or lithium batteries, but lithium iron phosphate batteries are the best for solar energy storage batteries.

However, with the booming development of solar energy, there are now many brands of low-voltage energy storage batteries on the market, so if you have not installed a suitable home battery, or your store is still considering adding suppliers, please don’t leave it. In this issue, we use five well-known brands as examples to teach you how to choose top-quality household low-voltage energy storage batteries: Tesla, Sonnen, Dyness, MeritSun, and LG Chem.

Tesla Powerwall Battery:

Tesla is an American electric vehicle and energy company that produces and sells electric vehicles, solar panels, and energy storage equipment. In recent years, Tesla's 13.5kwh backup battery system has gained a high status in home energy storage. It is a lithium battery integrated home energy storage system developed by Tesla Motors. Moreover, it is suitable for storing renewable energy, such as electricity generated by solar and wind energy, and supplying it to homes and businesses at night or when there is no wind.

Advantages:

1. Compact integrated design enables diversified installation in indoor or outdoor spaces;

2. With the Tesla app, you can monitor the power generation and consumption of your home in real-time;

3. Easy to install, simple in design, perfect for a variety of residential styles;

Disadvantages：

1. The capacity is single, and all are 13.5kwh, so it is not possible to provide a variety of capacities for customers to choose freely;

2. It uses NMC chemistries (lithium, magnesium, and cobalt), and cobalt poses safety concerns. It exacerbates the risk of power shortages and increases the likelihood of fires;

3. For most ordinary families, people are often deterred by Tesla’s relatively high price. Without any subsidies, expect to pay upwards of $16,000 for installation in your home.

Sonnen Solar Battery:

Sonnen Energy was founded in 2010 and is headquartered in Germany. It produces energy storage battery systems for private households and small businesses; it mainly produces, develops, and sells energy storage systems, inverters, battery management systems, and lithium iron phosphate batteries. Its system connects homes with solar panels and lithium battery energy storage systems, known as “virtual power plants.”

Advantages:

1. Highly flexible and can be installed on both AC and DC coupled systems;

2. Composed of a lithium iron phosphate battery (LiFePO4) ensuring extended safety and usage.

3. Provides a free warranty period of up to 10 years, which is of course as good as MeritSun’s after-sales service; it can bring a better user experience to customers.

Disadvantages:

1. The built-in AC coupled inverter device makes this product have certain limitations in matching the system configuration and cannot be applied to many applicable scenarios (such as pure off-grid systems);

2. AC-coupled cells are slightly less efficient; AC cell round-trip efficiency (charge and discharge losses) is about 88% to 90%, while most DC cells average closer to 96%.

Dyness Powerbox Battery:

Dyness is a Chinese company headquartered in Xi'an, the capital of Shaanxi Province. They started producing battery storage solutions for residential use in 2017. Dyness’ flagship product is the Powerbox, a modular system that can scale from a 2.4kWh system to a 9.6kWh system in a single unit, with the ability to run units in parallel for more storage capacity.

Advantages:

1. Can be used in off-grid and hybrid setups, compact design, modular expansion;

2. Designed with LiFePO4 (lithium iron phosphate) battery chemistry, modular and scalable design;

3. Requires inverter, compatible with some 48V hybrid or standalone inverters.

Disadvantages:

1. Only up to four batteries can be expanded, however, MeritSun can accommodate up to 16 batteries in parallel, enabling a total capacity of up to 240 kWh;

2. The appearance design is simple and rough, without too many instructions (such as SOC, etc.).

MeritSun Powewall Battery:

MeritSun has been a professional LiFePo4 battery manufacturer since 1999, focusing on alternative smart energy storage applications. We produce Cells, house-made BMS, modules, and integrated system solutions. For 24 years, MeritSun has done only one thing, Energy Storage Batteries.

Advantages:

1. Space Utilization: The 5kWh/10kWh wall-mounted battery has been impressively compressed to just an ultra-thin 10CM thickness;

2. Innovative Interaction: The introduction of the world's first full-color touch-screen control panel and remote Bluetooth connection making battery monitoring and control more intuitive and convenient, redefines the way users interact with batteries;

3. Superior Performance: The battery offers superior performance and longevity, boasting an industry-leading lifespan of ≥ 8000 cycles;

4. Aesthetically Pleasing Design: The battery's captivating design seamlessly blends technology and art. It goes beyond traditional energy storage devices, becoming a visually appealing addition to any space;

5. MeritSun's solution leverages cutting-edge lithium battery technology, elevating energy storage capabilities to meet diverse energy needs effectively.

The MeritSun low-voltage lithium battery for solar solution has 4 main components:

ABS Drop-in Series, Powerwall Series, All-In-One ESS Series, Stack Series.

All products are made with proven Lithium Iron Phosphate (LFP) battery chemistry.

• MeritSun low-voltage lithium batteries have very high flexibility. The system can be used for solar energy storage, demand fulfillment, planned energy dispatch, off-grid emergency power supply, and other applications. Additionally, as a factory, one of the advantages is that MeritSun supports custom lithium-ion batteries.

LG Chem Home Battery:

LG Energy Solutions is ranked as one of the world's largest lithium-ion battery manufacturers, with manufacturing plants in South Korea, China, and the United States. The company provides a variety of energy storage products for many industries, including electric vehicles, portable electronics, and stationary applications.

Advantages:

1. With DC coupling, technically speaking, DC coupled batteries tend to be more efficient because the energy does not need to go through the inverter until the battery is fully charged;

2. In terms of efficiency ratings, the LG Chem has a round trip efficiency of 96%, while the Tesla Powerwall claims a round trip efficiency of 90%.

Disadvantages:

1. Has a relatively high energy density and therefore does not dissipate heat as easily as other models.

2. Compared to the Tesla Powerwall, the Tesla’s peak available energy is 13.5kWh, while the LG Chem has only 9.3kWh.

3. Like Tesla, it uses ternary lithium technology, which has poor thermal stability. The theoretical life of the ternary lithium battery is about 800 cycles, while lithium iron phosphate can reach 4000 cycles or more cycles.

Key data of low-voltage battery energy storage system:

A solar backup system should be a good match in capacity, performance, and longevity to the solar system involved. If the residential battery storage is too small, it may not be enough to use all the power from the photovoltaic system. On the other hand, if you choose residential battery storage that is too large, your system will not be able to fully utilize its capacity, and the cost of a solar backup system may eat up the potential savings from generating solar power.

Choosing lithium iron phosphate battery or ternary lithium battery?

A lithium iron phosphate battery is a lithium-ion battery with a positive electrode made of lithium iron phosphate material and a negative electrode made of graphite material. Compared with other types of lithium-ion batteries, lithium iron phosphate batteries have higher safety.

Lithium iron phosphate batteries use inorganic salts as electrolytes, which have high thermal stability and resistance to overcharge and short circuits. Secondly, lithium iron phosphate batteries have a long cycle life. The cathode material of lithium iron phosphate battery has good stability and a cycle life of more than 2,000 times. In addition, compared with other lithium-ion batteries, lithium iron phosphate batteries have a lower self-discharge rate and can maintain a higher charge after being left for a long time. This makes lithium-iron phosphate batteries advantageous in some special application scenarios, such as electric vehicles and energy storage systems.

Talking about ternary lithium battery, first of all, it has high energy density. The cathode material of the ternary lithium battery contains gold elements with a high specific capacity, and its energy density is high. This makes ternary lithium batteries more suitable for applications that require higher energy density, such as electric vehicles and mobile equipment. Compared with lithium iron phosphate batteries, ternary lithium batteries are less safe. The cathode material of ternary lithium batteries contains high cobalt elements. Cobalt can easily cause thermal runaway under high temperatures, overcharge, and short circuits, thus affecting safety.

About Pre-sales and After-sales Services:

Regardless of whether you are a new or old customer, MeritSun always provides you with a complete and tailor-made solution system; All products are tested multiple times before being dispatched; Committed to providing best-in-class pre-sales and post-sales support, including a 10-year warranty and 24/7 technical assistance, giving you complete peace of mind with your energy needs.

After reading this sharing, if you have more questions about the product, please feel free to contact us.

By Claro

MeritSun Power Limited

export-15@meritsunpower.com

MeritSun was founded in 1999, we have 24 years of professional experience in energy and integrated solution services. We have 100+R&D teams, 1368 employees, 48 fully automatic production lines, and a 150,000 square meters factory, become the industry pioneers in battery suppliers through effective management.