With the FOSSiBOT FBP1200, FOSSiBOT is launching a complete system for balcony power plants that combines an inverter, solar charge controller, and battery storage in a single enclosure. The idea: no more connecting multiple components, no electrician needed—just plug it in, connect it to solar panels, and get started. In addition, thanks to app-based energy management, FOSSiBOT promises automated charging cycles based on electricity prices, integration with dynamic rates, and an emergency power function in the event of a power outage. The device is thus aimed not only at beginners who simply want to save on electricity costs, but also at tech-savvy users who want to equip their homes with partial self-sufficiency and an emergency power reserve. We’ll take a detailed look at whether it delivers in everyday use what the marketing promises.

The FBP1200 comes in a robust, weather-resistant housing with IP65 certification—an important detail, as the device is specifically designed for outdoor use on balconies, patios, or flat roofs.

Cooling is achieved passively via natural convection, so there is no fan noise—a noticeable advantage in residential settings compared to many actively cooled storage solutions.

The housing has a modular design: expansion batteries can be easily stacked without additional wiring—FOSSiBOT aptly compares this to stacking building blocks.
Overall, the build quality makes a high-quality impression, which is necessary given its outdoor installation: Seals, cable glands, and the wall mount all appear designed for durability.
Weighing 24.5 kg, the device can be carried short distances thanks to the two handles. For wall mounting, however, you should enlist the help of a second person. The optional extension batteries, by the way, weigh about 16.5 kg.
The unit itself features a clear display that shows the most important operating data at a glance: PV input power, total input power, battery level in percent with a bar graph, current grid feed-in power, the status (off-grid or grid-connected operation), as well as warnings in case of overheating or low battery temperature.
It also features status icons for Bluetooth and Wi-Fi connections, active EPS or UPS (uninterruptible power supply) functions, heating mode, connected smart meters or smart sockets, and an indicator for parallel connections with additional units. On the output side, AC, USB-C (PD), and USB power, as well as the total output power, are displayed.

The device is operated via four separate switches: a main switch, a switch for island/emergency power mode, a switch to turn the grid feed on or off, and a dedicated USB switch. This physical separation is practical for everyday use because, for example, the grid feed-in can be selectively deactivated without affecting the USB charging function or emergency power operation.
FOSSiBOT touts a plug-and-play design, and setup is indeed straightforward. If desired, you can first mount the wall bracket and hang the device. Of course, it can also be placed on the floor without any issues. Next, connect the solar modules via the PV input. Now just plug the AC cable into the outlet—and you’re done. Important for Germany: The standard grid feed-in is limited to 800 W, which complies with current regulations for balcony power plants.

According to the manufacturer, an increase to up to 2,400 W is permitted only after consulting with the responsible grid operator and in accordance with locally applicable regulations, and is primarily intended for users with higher self-consumption and the appropriate authorization. As with any balcony power plant, however, registration in the market master data registry is mandatory.
At the heart of the system is the FOSSiBOT app for iOS and Android. This app allows you to conveniently control the balcony power plant.
The app promises:
Important to know: According to the manufacturer, connecting to electricity pricing platforms may incur additional costs from third-party providers—this is not directly included in the FOSSiBOT app but depends on the respective rate provider. Those who do not use a dynamic electricity rate plan forgo some of the potential savings but still benefit from the pure emergency power and storage functions.
The app does what it’s supposed to, but it can’t really compete with the software solutions from market leaders like Zendure or Anker SOLIX. This applies primarily to the overview screen. Newcomers to energy storage systems, in particular, will need to allow for a certain learning curve here. Added to this are some annoying localization issues, such as occasional translation errors. FOSSiBOT will need to release updates to address these in the future.
When connected to the grid, the FBP1200 delivers up to 800 W of feed-in power—which is the current limit allowed in Germany for balcony power plants. According to the manufacturer, in the event of a power outage, the system switches to off-grid mode within 1 ms and then provides up to 1200 W, which should be sufficient to power essential devices such as a refrigerator, router, lighting, or chargers.
This uninterrupted switchover works similarly to a traditional UPS, but with significantly more usable capacity in the background. The PV input can handle up to 2000 W, though FOSSiBOT recommends connecting up to six SP420 solar modules with identical specifications.

According to the manufacturer, a full charge should be possible in about an hour under optimal sunlight conditions and with a full array of modules. However, anyone who wants to utilize the full 2000 W of PV power should consider adding at least one expansion battery so that the solar yield can actually be stored rather than going to waste.
A battery heater is built in for cold winter days: If charging occurs at temperatures below 0 °C, a heating mode automatically activates, gradually warming the cells until they reach at least 10 °C, thereby protecting them from cold damage. Combined with an operating temperature range of -20 °C to 55 °C and IP65 certification, the device can be used outdoors year-round.
A key selling point is scalability: If the base capacity of 1958 Wh is insufficient, users can retrofit up to four expansion batteries. FOSSiBOT offers fixed, complete packages for this purpose:
Additionally, according to the manufacturer, up to four FBP1200 units can be connected in parallel to the grid, enabling a peak total feed-in power of 4,800 W across four separate outlets —a scenario that, however, is relevant only for larger properties with correspondingly high energy consumption and should in any case be coordinated in advance with a licensed electrician and the utility provider. FOSSiBOT itself points out that a licensed electrician should be consulted for power ratings exceeding 2,400 W or device capacities exceeding 15 kWh.
The FBP1200 is aimed less at users who are simply looking for an affordable entry-level balcony power plant, and more at anyone who has the following priorities from the start:
If you simply want to operate one or two modules without storage or an emergency power function, a basic micro-inverter kit might be a more cost-effective option. The added value of the FBP1200 is particularly evident when storage capacity, emergency power capability, and smart load management are all required. Higher-priced alternatives include, for example, the Anker SOLIX Solarbank 4 Pro (Review | € 1,598.99 *) or the Zendure SolarFlow 2400 Pro (€ 1,099.00 *).
The FOSSiBOT FBP1200 has convinced me that the all-in-one approach is worthwhile for balcony power plants—and at a price that’s quite impressive. For a suggested retail price of €699, you get an inverter, charge controller, and battery all in one enclosure, plus an emergency power function and app control—all without needing to call an electrician. Compared to individual components or similarly equipped systems from the competition, this is a truly fair deal. IP65 certification and battery heating also ensure that the system can withstand outdoor conditions year-round, and the emergency power switchover within 1 ms is a real plus in everyday life during power outages. There are some minor drawbacks with the app, which doesn’t quite match the maturity of Zendure or Anker SOLIX.
Conclusion
The FOSSiBOT FBP1200 impresses as an all-in-one system with solid build quality, well-thought-out features, and strong value for money. Ideal for beginners, but tech enthusiasts will also find plenty to appreciate. Despite an unpolished app, it's a clear recommendation at the MSRP of €699.
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