Marstek Energy throws down a price gauntlet with its Venus A balcony storage system

Marstek Energy announced its Venus A balcony energy storage system, which features 2.12 kWh storage and a built-in inverter with four MPPTs, is set to launch before the end of 2025 at a price of EUR 499.

The price is a dramatic undercut of competitors and is set to shake up the residential storage market. According to Marstek, its unit is self-manufactured, including the battery cells, inverter, and housing.

The reveal and announcement came on the sidelines of IFA 2025, with Marstek Energy hosting an audience of German solar distributors and partners to announce new products. While a new balcony solar storage solution was expected, the price alone drew audible reactions from the audience.

The Venus A has a base capacity of 2.1 kWh and a 2.4 kW PV input. Both systems feature four MPPTs and provide 1.2kW for both off-grid and on-grid output.

During the launch presentation in Berlin, Marstek positioned the Venus A against a competitor, identified as the Anker Solix E2700 Pro. Comparing the two, the Anker unit has a 2.688 kWh capacity plus expansion options, and 3.6kW PV input, also with four MPPTs. The product, which was shown with a price of €1299 in the slide below, though at the time of writing, the Anker website had a list price of €1199.

Another popular option from EcoFlow’s Stream series, the EcoFlow Stream Ultra, offers 1.92 kWh of storage along with an in-built inverter to handle up to 2 kW of solar generation for €1099, though at the time of writing it was available for €849 directly on the website.

The €499 price indicates that Marstek is eager to win business, as the unit is priced at less than half the cost of the Anker Solix product and is highly competitive with EcoFlow and others on the market.

Marstek’s offer

Aside from the capacity of 2.12 kWh per unit, the Venus A features a modular design, allowing for expansion with up to five units for a total capacity of 12.72kWh. The system provides 1.2 kW of bidirectional on-grid power and 1.2 kW of backup power, with a peak output of 1.44 kW for 60 seconds.

The system utilizes lithium iron phosphate (LFP) cells, made by Marstek, which provide over 6000 life cycles, and are supported by a 10-year warranty. Additional features include an Emergency Power Supply (EPS) switchover time of 15ms and an IP65-rated enclosure. For regulation compliance, it supports anti-feed-in functionality with smart meters from Marstek and Shelly.

The launch was for Germany, where balcony power is ever-popular. A Marstek representative told ESS News that it expects wider availability in 2026.

Marstek had previously launched a Venus D balcony energy storage battery at Intersolar in 2025 with modular 2.56 kWh battery packs and a higher price point, but is listed as sold out on the Marstek site.

Marstek data points

Marstek told the audience that it had registered 293,400 sales of its other products in Europe between January and August in 2025 alone, eclipsing sales of 79,856 in 2024 and 18,631 in 2023.

Talking about the scale of its operations during the presentation, Marstek said it has more than 400 R&D engineers in China. In terms of its vertical integration, it can produce 30 million LFP battery cells annually at a production area of 60,000 square meters for the cell production alone, with manufacturing bases in Shenzen, Jishou, Luxi, and Nantong in China, stretching to 360,000 total square meters encapsulating its full production.

The in-house manufacturing extends to mold injection, Surface-Mount Technology (SMT) production lines, charging cable manufacturing, and automated final assembly and aging systems.

ESS News could not verify the presented information.

Not explicitly stated was that Marstek is part of Hamedata Technology or Hame, a well-established Chinese manufacturing company founded in 2009 and floated via an IPO on the China NEEQ exchange in 2016. According to its reports to investors, it previously made a $30 million investment in a battery cell factory.