Marstek

Who is Marstek

Marstek is the energy storage brand of Shenzhen Hame Technology Co., Ltd, a Chinese electronics manufacturer founded in 2009. Hame started out making power banks and portable chargers before moving into home energy storage. Marstek now operates as Hame’s dedicated battery and solar storage line.

The company develops its own lithium iron phosphate cells in-house, rather than buying them from an outside supplier. In May 2026, Marstek opened a new global headquarters at the Pingshan New Energy Vehicle Industrial Park in Shenzhen, which it described as a step up in its international expansion. The brand has grown quickly in Europe in particular, where plug-in balcony batteries have become popular in Germany, the Netherlands and neighbouring markets.

Marstek describes itself as one of relatively few Chinese energy storage firms with in-house control over cells, inverters, battery management and energy management software. In short, it positions itself as a vertically integrated specialist rather than an assembler of bought-in parts.

The Marstek product range

Marstek’s range centres on two stackable storage families, Venus and Jupiter, plus a smaller Saturn line. All three use the same self-developed LFP cells, but they differ in how they connect to your home’s wiring and solar panels.

The Venus series

Venus is Marstek’s original and largest family of plug-in batteries. Individual units range from the compact Venus B, at 2kWh, up to the Venus E Max, at 10kWh per unit. The Venus A sits at the entry end, with a 2.12kWh base unit that can be expanded with up to five extra packs for a 12.72kWh maximum. The mid-range Venus C and Venus E hold 2.56kWh and 5.12kWh respectively, and up to three units can typically be linked per phase for around 15kWh of combined storage.

Marstek unveiled a new Venus E generation in 2026, including a slim Venus E Mini aimed at smaller spaces and a higher-capacity Venus E Max. These newer units pair with Marstek’s SmartBox accessory, which lets several batteries work together across a single-phase or three-phase supply and adds whole-home backup during a power cut. As a result, a Venus-based system can grow from one starter unit into something closer to a full home battery, without swapping out the original hardware.

The Jupiter series

Jupiter is Marstek’s newer, all-in-one line. Unlike most Venus units, the flagship Jupiter C Plus has its own built-in micro-inverter with four MPPT inputs, so it can connect straight to solar panels as well as the grid. It stores 2.56kWh at the base and can be expanded to 10.24kWh with add-on battery packs. In practice, this makes Jupiter more of a complete, out-of-the-box solar-plus-storage kit, whereas Venus leans on an inverter or micro-inverter already on the property.

Both ranges share the same Marstek App for monitoring and control, and both support Self Consumption, AI Optimisation and Manual operating modes. Meanwhile, the smaller Saturn series, including the Saturn B2500-D, covers buyers who want a lighter, lower-capacity entry point of around 2.24kWh.

Key technology behind Marstek

Every Marstek battery runs on lithium iron phosphate (LFP) cells that the company develops and laminates itself, rather than sourcing from a third party. LFP cells are valued for thermal stability, so they carry a lower risk of thermal runaway than some other lithium chemistries.

Most current Venus and Jupiter models are rated for over 6,000 charge cycles, and Marstek backs them with a 10-year warranty. The newest Venus E Gen 4.0 and Venus E Max units, unveiled in 2026, claim over 10,000 cycles. However, that figure is newer and has less independent track record behind it than the established 6,000-cycle rating on the rest of the range.

All units connect through the Marstek App over Bluetooth and Wi-Fi, which handles firmware updates, usage history and mode switching. For anti-feed-in control, Marstek batteries pair with its own CT002 and CT003 smart meters, as well as third-party meters such as Shelly’s Pro 3EM and HomeWizard’s P1 meter. In addition, the optional SmartBox accessory links multiple units together and adds backup power during an outage, which isn’t otherwise available from a single plug-in unit on its own.

Strengths and limitations

Like most plug-in battery specialists, Marstek trades some of the flexibility of a full home battery for a simpler, lower-cost setup. The list below sums up where that trade-off helps, and where it doesn’t.

Where Marstek fits the market

Marstek sits in the same plug-in and balcony battery category as brands such as Anker Solix, Growatt’s Noah line and Indevolt. These products target people who want to add storage to an existing solar setup, or start one, without a full rewiring project.

That positioning makes installation rules particularly important for Marstek. In Germany, for example, small systems under certain power thresholds can usually be self-installed and simply registered in the national Marktstammdatenregister. That suits Marstek’s plug-and-play design well. However, exceeding those thresholds, or connecting a larger Jupiter array, can trigger normal grid-operator approval instead.

In Great Britain, the picture is different. New rules from 27 August 2026 made it legal to self-install a plug-in solar panel kit up to 800W, without using a certified installer. Crucially, though, those rules explicitly exclude plug-in battery storage devices. In other words, a Marstek Venus or Jupiter battery still needs installing under ordinary UK electrical and battery-storage rules, even where a plug-in solar panel beside it might not. Northern Ireland, meanwhile, follows its own separate arrangements.

Elsewhere, requirements vary by country and by local grid operator, so it’s worth checking local rules before treating any plug-in battery as a pure DIY job. Marstek’s Venus series does hold German VDE-AR-N 4105 grid-compliance certification, which helps with approvals in markets that recognise it. That said, this isn’t a substitute for checking your own country’s requirements.

If you’re weighing Marstek against a full-size home battery, our guide to battery capacity explains how kWh ratings translate into real-world backup and savings. Our free home battery calculator can also help you work out what size of system actually fits your usage, whether that’s a single Venus unit or a stacked Jupiter setup.

Common questions about Marstek