SunEnergyXT BK215 Plus Energy Storage Unit – 2.15 kWh

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SunEnergyXT B215 PLUS Extension Storage

Modular battery 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 was developed to efficiently store self-generated solar power and use it at a delayed time – exactly when you need it.

More independence from the power grid

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

Compatible & flexibly deployable

The BK215 PLUS is compatible with common micro-inverters such as APsystems and Deye. Depending on the module configuration, two solar modules can be connected per PV input, either 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

The 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 extension modules. The modules can be stacked space-saving or mounted side by side. This way, the storage system grows step by step with your energy needs – without system changes.

Intelligent zero feeding

In connection with a suitable energy meter, the storage unit dynamically adjusts its output to the actual household consumption. Surpluses are not fed into the public grid. Supported, among others:

• Shelly 3EM / Shelly 3EM Pro

• Bitshake IR Reader (Tasmota)

• EcoTracker

Expandable with AC charging & additional functions

With the optional SunEnergyXT EV3600 module, the storage unit can also be charged via a standard 230-V socket. This enables, among other applications:

• AC-coupled storage of PV surplus

• Using dynamic electricity tariffs

• Local emergency power supply

• Integration into wall box 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 extension storage (2.15 kWh)

Why choose the SunEnergyXT storage?

Let your balcony power plant shine in full glory!

The SunEnergyXT balcony power plant storage 2150 Wh is your gateway to efficient and intelligent energy storage. Rely on our innovative solution and experience the energy 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 you receive the correct version of the storage unit. 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 storages for maximum power and PV performance.

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

• Easy commissioning: Convenient use thanks to the protection contact 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 stand heater.

• 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. Simply unpack, connect, done.

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

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

Not only were technical values 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 was significantly reduced.
With the same storage capacity of 2.15 kWh, the PLUS is significantly lighter than its predecessor.

Advantages for you:

• Easier assembly

• Lower load for balcony

• Ideal for rental 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 deep-temperature cells.
This allows charging and discharging even at 0 °C – a clear advantage over many conventional storage systems.

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

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

Get more from your solar energy

Through improved MPPT tracking, an optimized battery PACK design with lower internal resistance
and a revamped heat dissipation system, the BK215 PLUS works 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 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 to 1 main module + 7 extension modules
for a total capacity of up to 17.2 kWh.

This way, you invest today – and remain 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 when the storage simply should run reliably – without tinkering.

For advanced users

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

App control immediately ready for use

Local control optional

Compatible with Home Assistant

Extremely fast regulation

Works even without internet

You determine how deep you want to dive.