SunEnergy XT B215 Plus Expansion Storage Unit - 2.15 kWh

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SunEnergyXT B215 PLUS Expansion Storage

Modular energy storage for balcony power plants

The SunEnergyXT BK215 PLUS is a powerful, modular battery storage system for balcony power plants and small PV systems. It has been developed to efficiently store self-generated solar energy and use it at a later time – just when you need it.

More independence from the power grid

During the day, excess solar energy is automatically stored. In the evening, at night, or during low sunlight, the storage system makes the electricity available again. This reduces grid reliance, lowers electricity costs, and noticeably increases self-consumption – without complex installation.

Compatible & flexibly usable

The BK215 PLUS is compatible with common micro-inverters such as APsystems and Deye. Up to two solar modules can be connected per PV input, depending on the module configuration in series or parallel.

• Output power up to 2,000 W at 2.15 kWh

• Up to 2,400 W starting from 4.3 kWh storage capacity

Compliance with the applicable legal performance limits for balcony power plants must be observed.

Modular expandable up to 17.2 kWh

The base module with 2.15 kWh can be combined with up to 7 expansion modules. The modules can be space-saving stacked or mounted side by side. This allows the storage system to grow step by step with your energy needs – without changing the system.

Intelligent zero feed-in

In conjunction with a suitable energy measuring device, the storage dynamically adjusts its output to the actual household consumption. Surpluses are not fed into the public grid. Supported devices include:

• Shelly 3EM / Shelly 3EM Pro

• Bitshake IR reader (Tasmota)

• EcoTracker

Expandable with AC charging & additional functions

With the optional SunEnergyXT EV3600 module the storage can also be charged via a regular 230-V socket. This allows for various applications:

• AC-coupled storage of PV surplus

• Use of dynamic electricity tariffs

• Local emergency power supply

• Integration into wallbox and energy management systems

Full transparency via app

The SunEnergyXT App provides real-time insights into charge status, energy flows, and history. Settings can be conveniently adjusted remotely – for maximum control over your solar energy.

Suitable for indoor and outdoor use

Thanks to the IP65 protection class the BK215 PLUS is reliably protected against dust and splashing water and can be operated outdoors without any issues.

Scope of delivery

• 1 × SunEnergyXT B215 PLUS Expansion Storage (2.15 kWh)

Why the SunEnergyXT storage?

Let your balcony power plant shine in full glory!

The SunEnergyXT balcony power plant storage with 2150 Wh is your gateway to efficient and intelligent energy storage. Rely on our innovative solution and experience the power of the sun like never before.

Compatible with SUNLIT, SunEnergyXT, Deye, TSUN, Hoymiles (OpenDTU) and APsystems inverters

Please let us know after your order which inverter you are using so that the correct version of the storage can be provided. If you do not have any of these inverters, please contact us for a special offer.

• Generous storage capacity: Impressive 2150 Wh capacity to store excess energy and use it later.

• Scalable storage solution: Expand with up to 3 additional SunEnergyXT storage units for maximum power and PV performance.

• 24/7 power supply: Secure energy for day and night, thanks to the SunEnergyXT storage solution.

• Easy commissioning: Convenient use thanks to a plug for effortless installation.

• Plug solar expansion: Easily expandable up to 4 kWp and 8.6 kWh, without installation costs.

• Including 0% tax rate: The current 0% tax rate according to JStG 2024 is already included in the price.

• Powerful output: Up to 1920 watts output power with bypass function for flexible use.

• Versatile application: Use the storage indoors or outdoors thanks to IP65 certification and BMS with heating.

• Real-time monitoring: Optimize feeding with the SunEnergyXT Solar App through real-time monitoring.

• Flexible connection: 4x MC 4 connectors for output power and 2x MMPT inputs for 1600 watts PV input power.

• Practical and lightweight: Weighing only about 23.8 kg, easy to handle and transport.

Rely on the SunEnergyXT balcony power plant storage BK215 and experience an energy-efficient future for your balcony power plant!

SunEnergyXT BK215/B215 PLUS

The most powerful storage solution in its class

Installation? Child's play.

No complicated technology. No special tools needed. Just unpack, connect, done.

Perfect for beginners – even without prior knowledge.
After a few minutes, your own power plant with storage is up and running.

More than an upgrade – the BK215 PLUS has been optimized for real use.

Not only technical values have been improved, but especially everyday usability: easier installation, higher performance, better efficiency – even in winter.

30% less weight – same capacity

Thanks to modern high-energy cells, the weight of the BK215 PLUS has been significantly reduced.
With the same storage capacity of 2.15 kWh, the PLUS is much lighter than the previous version.

Advantages for you:

• Easier assembly

• Less load for the balcony

• Ideal for rented apartments and retrofitting

More power when you need it

The BK215 PLUS already delivers up to 2 kW discharge power with one storage module.
With two or more modules, up to 2.4 kW is possible.

This means:

• More stable supply in the evening hours

• More simultaneous consumers

• Less dependence on the power grid

Reliable even in cold

The BK215 PLUS uses specially developed low-temperature cells.
This makes charging and discharging possible from 0 °C – a clear advantage over many conventional storage systems.

Especially in the transition and winter months, this increases the actual usability of your solar energy.

Additionally, the BK215 PLUS has an integrated heating system that brings the storage to operational temperature even at outside temperatures of up to −20 °C and thus enables use in winter.

Get more out of your solar energy

Through improved MPPT tracking, an optimized battery PACK design with lower internal resistance
and a revised heat dissipation, the BK215 PLUS operates particularly efficiently.

Result:
More of the generated energy is actually stored and used – instead of being lost.

Professional connections – simple installation

The BK215 PLUS is fully equipped with solar connections .
Thus, additional cable connections are eliminated and the installation becomes safer and more reliable.

Ideal for existing balcony power plants and professional PV components.

Modular expandable – grows with your needs

The BK215 PLUS can be flexibly expanded:
from an entry-level system with 2.15 kWh up to 1 main module + 7 expansion modules
for a total capacity of up to 17.2 kWh.

So you invest today – and stay flexible for tomorrow.

Full freedom of choice: App or Home Assistant

Start immediately via app – or control locally via API for maximum control.

For beginners

Open the app, connect, done. Ideal if the storage is simply supposed to run reliably – without tinkering.

For advanced users

Home Assistant + local API in the home network. For your own automations, quick regulation, and full data control.

App control ready to use immediately

Local control optional

Home Assistant compatible

Extremely fast regulation

Works even without the Internet

You decide for yourself how deep you want to get involved.