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Household energy storage enters the high voltage era
With the global popularity of electric vehicles and the continuous increase in the cost of electricity prices for residents, the capacity of household storage systems is gradually increasing.
High voltage is an important trend in the development of household storage products. The high voltage can reduce the current, thereby reducing the heat generation, and improving the discharge efficiency and safety.
This article will analyze the reasons for the popularity of high-voltage household energy storage and introduce some high-voltage system products and batteries.
What is a high voltage battery?
High-voltage batteries usually have a battery pack voltage above 48V, and multiple cells can be connected in series to achieve high voltage at the battery pack level.
Compared with low-voltage systems, high-voltage systems have higher requirements for cell consistency and BMS management capabilities, and relatively higher technical thresholds.
Therefore, the main markets for high-voltage home energy storage are still developed countries and regions such as Europe, Japan, and Australia.
In Latin America, Africa, and Southeast Asia, where prices are more sensitive, low-voltage home energy storage systems are still the main market.
In addition, among the top 10 powerwall manufacturers for home energy storage in the world, Tesla’s home energy storage occupies a dominant position in the US market.
Why is high-voltage energy storage becoming popular?
On the one hand, high-voltage household energy storage systems are safer, more stable, and have higher system efficiency than low-voltage ones.
The circuit topology of the hybrid inverter under high voltage system is simplified, the size and weight are reduced, and the failure rate is reduced.
On the other hand, high-voltage home energy storage systems are cheaper than low-voltage energy storage systems. When using batteries with the same capacity, the battery current of the high-voltage energy storage system is smaller, and the interference to the system is less.
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Moreover, the requirements for the selection of electronic components are relatively low, and the cost is therefore relatively low.
The overall gross profit margin of the high-voltage three-phase product system is 20% higher than that of the low-voltage product, matching the three-phase electricity demand in villas and other scenarios, and is expected to continue to grow in the high-end market share.
High voltage household energy storage system products
The high-voltage trend of household storage systems is obvious, and many companies have launched high-voltage energy storage products one after another. The following is a brief introduction of several high-voltage system products.
PYLONTECH
Pylon’s outdoor waterproof stackable household energy storage products adopt a modular design. The products are divided into two specifications: parallel type and series type.
The Force-H system increases the working voltage by connecting battery modules in series, and expands capacity by connecting multiple cabinets in parallel. All mainstream inverters are compatible with Paineng products to achieve plug and play.
Among them, the nominal capacity of the Force-H1 system is 24.864KWh (the capacity of a single battery module is 3.552KWh), the nominal voltage is 336V, and the rated rate is 0.5C.
BYD
BYD exhibited two home energy storage products, Energy Panel and Energy Pod.
The Energy Panel wall-mounted household energy storage all-in-one machine is only 80mm thick, uses lithium iron phosphate blade batteries, supports flexible configuration of 6.6~26.4kWh, and has a rated voltage of 51.2V. It is a low-voltage household energy storage system.
The Energy Pod DC household energy storage system adopts lithium iron phosphate battery, which combines function integration and modular design, including EMS and battery box DC system.
It is faster and more convenient to install and expand, and can support off-grid applications. Energy Pod can stack 2~4 battery boxes, supports 8.64~17.28kWh capacity configuration. The rated voltage can be 204.8/307.2/409.6V, and the maximum working altitude can reach 4000 meters.
GOODWE
GOODWE Lynx Home F series high-voltage lithium battery adopts scalable battery modular design.
Each battery module has a capacity of 3.27kWh, and can support 2-5 battery modules used in series. The flexible combination and expansion of the battery capacity of 6.6-16kWh can be realized as a whole.
The intelligent design further simplifies installation, operation and maintenance. Using lithium iron phosphate battery, 1C charge and discharge can reach 80% EOL. LX F6.6-H, LX F9.8-H, LX F13.1-H, LX F16.4-H rated voltages are 204.8/307.2/409.6/512V respectively.
High voltage battery products
POWERAMP
POWERAMP home energy storage solutions include PR-L, PR-A, PR-M, PR-H, PR-S1, PR-S2 and other products.
Among them, the PR-H all-in-one machine series is aimed at large home storage markets such as Japan and Australia.
It supports the new installation of solar storage or the after-installation of photovoltaic energy storage after upgrading. The capacity configuration can be 7.68/11.52kWh, and the rated voltage can be 51.2/102.4/153.6 V.
The PR-S1 series is aimed at the German and Australian mass storage markets. It has a stacking architecture that supports a capacity configuration of 6.99kWh23.3kWh and can stack 3-10 battery modules.
It can also support up to four parallel machines, has a working voltage range of 117.6493V, and has a cycle life of up to 6000 times.
The high-voltage home storage market in Europe and the US is the target market for the PR-S2 series. It has the benefits such as excellent environmental adaptability, IP65 protection, easy expansion, long life, easy installation, and high safety.
The maximum number of parallel machines that can be supported is 4, and the rated capacity is 32.65Ah. The working voltage range can be 179–691V, and 2–6 battery modules can be stacked.
Far East Battery
Far East Battery high voltage battery FEB-HV5120-S1, a single battery module has a charge capacity of 5.12kWh, a rated voltage of 102.4V, and a rated capacity of 50Ah. Up to 8 batteries can be connected in series, with flexible expansion IP55, support for outdoor use, and high energy density , modular design, stackable installation, flexible investment and other advantages.
COSPOWERS
COSPOWER CE-X-S series high-voltage stacked energy storage battery, which integrates lithium battery pack, high-voltage control box and BMS battery management system.
The system has a four-level protection strategy, which can support 2-6 battery modules used in series, and the stacked installation method simplifies installation, operation and maintenance.
The CE-X-S series uses lithium iron phosphate batteries, a single battery pack is 5.12kWh, and can be expanded to 30.72kWh.
Summary
In short, high voltage means that the voltage platform rises. If the total energy storage system capacity is to be kept constant, the battery cells need a smaller capacity.
The energy storage cells of the low-voltage platform are mostly 100Ah, while the high-voltage platform gradually transitions to 50Ah.
The smaller capacity of the battery cells means that more batteries need to be connected in series, which puts higher requirements on the consistency and stability of battery manufacturers’ battery products.
Lithium battery manufacturers may follow up household storage needs and propose new battery solution.
