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MARSTEK

Balcony storage and micro-inverters

Storage designed to plug in rather than be installed.

The category

A balcony battery sits between the panels and the socket, holding what the sun made at noon so it can be used at seven in the evening. No electrician, no consumer unit work, no export tariff argument.

Whether that is permitted, and at what power, is set by the grid rules where you are rather than by the product.

The two questions on that page

Usable capacity as against nominal — the difference can be a fifth — and what the standby draw is. A storage unit that consumes while idle is spending part of what it stored.

The micro-inverter

Read against its input window, its output ceiling and the grid standard it declares.

One thing worth recording

The data behind one of these listings arrived from the source with a character encoding fault in the product title. It is reported on the page as a fault rather than reproduced as a name.

MARSTEK in this catalogue

  • MARSTEK 800 W micro-inverter, 2026 revision

    800 W · 2 MPPT inputs · limits not published · MPPT efficiency 99.8 %, peak 96.5 % · grid standard not named · monitoring not described · IP67 · MC4 plug and play

    An 800 W micro-inverter with two independent MPPT channels quoted at 99.8 % tracking efficiency and 96.5 % peak conversion, with MC4 connectors and IP67 protection.

    Best for: A straightforward two-panel balcony where monitoring is not wanted and MC4 is what the panels have.

    ≈ €90

  • MARSTEK B2500-D, 2240 Wh, IP65

    2240 Wh nominal · LiFePO4, 6000 cycles · expandable · IP65 · AC-coupled via a micro-inverter · smart meter optional

    A 2240 Wh LiFePO4 balcony storage unit rated IP65, coupled through a micro-inverter, expandable, and installed without an electrician according to its listing.

    Best for: A balcony installation that already has a micro-inverter and wants storage added without rewiring.

    ≈ €311

  • Marstek M2-800, 800 W, two MPPT, with a 5 m lead

    800 W maximum output at 230 V · 2 inputs · limits not published · 2 MPPT · grid standard not named · Bluetooth and WiFi · IP67 · warranty not stated

    An 800 W micro-inverter supplied with a 5 m Schuko lead, rated IP67, with two MPPT inputs and both Bluetooth and WiFi monitoring.

    Best for: A buyer who wants the lead in the box and will get the datasheet from Marstek separately.

    ≈ €87

A price quoted in the text of a PowerVerdict page dates from the day that page was written; the live figure beside each product is fetched while you read and replaces it.