GoldenOctober Deals

For every storage unit from our PLUS series, you get a free EcoTracker or microinverter. Get the most out of the last rays of sunshine this year!

3 October – 31 October 2026

Modular solar power storage system & bidirectional inverter

BK215 main power storage unit, B215 expansion power storage unit & EV3600 bidirectional inverter

Balkonkraftwerk banner

Was kann die neue Plus-Version der SunEnergyXT-Speicher?

SunEnergyXT put to the test: balcony power plant storage with charging station for electric cars

With the BK215, SunEnergyXT (formerly SunLit Solar) offers a balcony power plant storage unit with 2.15 kWh, which can be expanded to up to 8.6 kWh with additional modules. With the optionally available bidirectional inverter EV3600, the storage solution can also be used to charge electric vehicles. Together with the SunEnergyXT storage unit BK215 combined with three expansion units, the solution offers a charging power of 3.6 kW as well as two emergency power sockets. If the EV3600 is connected to the power grid, it even reaches 11 kW. The system also supports island/off-grid operation, ideal for use in a carport.

The editorial team's conclusion: "Anyone looking for an island-capable solution for charging their electric vehicle will find exactly what they need with the flawlessly built and reliable SunEnergyXT solution and the optionally available EV3600 inverter."

heise online

SunEnergyXT impresses with modularity and high capacity in Handelsblatt practical test

The Handelsblatt editorial team tested our BK215 PLUS with two B215 PLUS expansion units and the EV3600. In a detailed test report, they describe the installation, app setup, everyday use, and especially the AC charging and emergency power functions. Their final verdict:

"The SunEnergyXT BK215 PLUS with two B215 PLUS units and the EV3600 is aimed at people looking for a balcony power plant storage system with additional system functions. 6.45 kWh, four PV inputs, external microinverters, app, Home Assistant, AC charging, emergency power, and wallbox connectivity form a versatile foundation. The system is particularly interesting for households with regular solar surplus, higher evening consumption, dynamic tariffs, or planned e-mobility.

Technically interested homeowners, workshop users, and households with higher consumption get an expandable platform. Under these conditions, my purchase recommendation is positive, provided that the combination of storage, AC charging, emergency power, and wallbox offers concrete benefit in everyday life."

To the Handelsblatt Practical Test

Flatter, lighter and stronger? COMPUTER BILD tests the SunEnergyXT BK215 PLUS

This is how the editorial team judges the successor to the BK215:

"The SunEnergyXT BK215 Plus is a successful facelift of the well-known balcony power plant storage system. In the practical test, it scored particularly well with lower weight, better handling, MC4 connectors, and high expandability. The dynamic control via smart meter works well in everyday use, but not perfectly with abrupt load changes.

Overall, the system is a good choice for anyone who wants to retrofit an existing balcony power plant with a compatible microinverter or build a flexibly expandable system."

To the COMPUTER BILD Practical Test

BK215 rated "very good" in comprehensive solar power storage system test

This is how the editorial team of Home & Smart rated our storage unit: "The BK215 storage unit offers an impressive storage capacity of 2.15 kWh, which can be expanded with up to three B215 additional modules to a total of 8.6 kWh, making it one of the absolute top contenders. (...) During our test, all components could be easily plugged together and wired. Additionally, the connection with the manufacturer's app worked significantly faster than with other test storage units. (...) As a supplement to the practical test, we also conducted a brief check of the manufacturer's customer service, contacting them both in writing via email and over the phone. In both cases, we benefited from short response times and encountered friendly staff, which we consider a clear advantage. (...) Due to its ease of use and high storage capacity, we can recommend the BK215 to anyone looking to store a large amount of energy long-term."

The editorial team's conclusion: “An indoor- or outdoor-usable solution for comprehensive power storage.”

To the Home & Smart Test

Die NEUEN SunEnergyXT Modelle:

BK215 Plus und B215 Plus - Alle Infos im Überblick!

SunEnergyXT

GoldenOctober Deals

For every storage unit from our PLUS series, you get a free EcoTracker or microinverter. Get the most out of the last rays of sunshine this year!

3 October – 31 October 2026

Golden October Deals: Get your free gift!

Make your autumn golden with our PLUS series. From 3 – 31 October, you'll receive an everHome EcoTracker IR or a Deye 800 W microinverter (SUN-M80G4-EU-Q0) free with every storage unit from our PLUS series (BK215 PLUS, B215 PLUS and EV3600)! Simply buy a storage unit during the promotional period, send your receipt / invoice, your gift choice and your address by email to aktion@sunenergyxt.com by 14.11.2026 and receive your gift by post. Get the most out of the last rays of sunshine this year!

Frequently asked questions (FAQ) about the Golden October Deals:

Here you will find all the answers about our Golden October Deals. Can't find your question? Our support team will be happy to help you!

It's really simple!

Online retail: Simply buy a new storage unit from the PLUS series (BK215 PLUS, B215 PLUS or EV3600) from one of our online retail partners during the promotional period. Then send us your invoice by email to aktion@sunenergyxt.com no later than 14.11.2026 and tell us your gift choice (everHome EcoTracker IR or Deye 800 W microinverter SUN-M80G4-EU-Q0) and your shipping address. Once your claim has been successfully verified, we will send you your gift by post free of charge.

In-store retail: Buy a storage unit from the PLUS series (BK215 PLUS, B215 PLUS or EV3600) from a participating brick-and-mortar retailer during the promotional period. Then send us your proof of purchase by email to aktion@sunenergyxt.com no later than 14.11.2026 and tell us your shipping address. Once your claim has been successfully verified, we will send you your EcoTracker IR by post free of charge.

All private end customers with their place of residence or business in Germany are eligible to take part. Wholesalers and resellers are excluded from the promotion.

The promotion starts on 03.10.2026 and ends on 31.10.2026. The purchase date on your receipt or invoice determines eligibility. Please note: the promotion is only valid while stocks last. So it pays to be quick!

No, the promotion applies exclusively to the models of our PLUS series (BK215 PLUS, B215 PLUS, EV3600). Older models, refurbished items or storage units from other series are excluded from this sales promotion.

This promotion can be combined with other vouchers, discount codes or special conditions. However, you can only receive one free gift per purchase, regardless of the number of storage units purchased.

If you exercise your statutory right of withdrawal and return the storage unit, your entitlement to the bonus also expires. In this case, you must return your gift to us unopened and in its original packaging.

No, a cash payout, exchange or transfer of the bonus to other products is not possible.

Customer reviews

Here's how our customers rate their experience with the SunEnergyXT system:

Simply thrilled. I want to take this opportunity to praise the SunEnergyXT support! It's just great how quickly and smoothly they help you. Very rare these days but so important, especially with DIY Solar. Thumbs up from me, and keep it up.

— Kai Ed K.

The storage system can be easily integrated into an existing plug-in PV plant and can also be expanded later on. Technical questions are answered very quickly by the great support team.

— Thomas F.

With SunEnergyXT, there is NO longer a single argument for not starting with PV. The SunEnergyXT storage system is the only system that can be individually adapted to your own needs and possibilities on both the consumption and generation side. Everything is possible, from very small to a real PV system. The support and community are unbelievably good!

— Lutz R.

Great system that is very easy to put together. Plus a support that helps quickly at all times.

— Enrique M.

SunEnergyXT's modular power storage system - it's really that simple!

Holger Laudeley relies on the solar power storage system by SunEnergyXT

Mr. Energy Transition, Holger Laudeley, presents the SunEnergyXT power storage system.

Product video of the BK215 & B215 (main & extension) power storage units

Watch our video to find out more about the advantages and features of our power storage system, how you may control the power storage system using the SunEnergyXT-App and much more...

BOOK YOUR FREE CONSULTATION NOW
Plus-Version
1. Generation
Vergleich
BK215 PlusB215 PlusEV3600
Speicherkapazität
2,15 kWh2,15 kWhNur in Kombination mit mind. 1x BK215 einsetzbar
Ausgangsleistung
4 x 33,6 V - 43,2 V / 25 A max. 1 x Speicher, Nennleistung 2000 W4 x 33,6 V - 43,2 V / 25 A max. ab 2 x Speicher, Nennleistung 2400 W
  • 230 Vac / 50 Hz / 16 A Max
  • AC-Ausgang (x2) / Wallbox AC-Ausgang (x1)
  • 230 Vac / 50 Hz / 16 A Max, 3,68 kW (einphasig)
  • 400 Vac / 50 Hz / 16 A Max, 11,04 kW (dreiphasig)
  • Netzanschlusspunkt (x1)
Eingangsleistung
2 x 10 V - 60 V / 22 A, absolute max. Spannung 90 V, pro Eingang max. 800 W1 x 10 V - 60 V / 22 A, absolute max. Spannung 90 V, pro Eingang max. 800 W25 W Leistungsaufnahme bei Nullast
Gewicht
ca. 24,8 kgca. 24,5 kgca. 19 kg
Konnektivität
Shelly, EcoTracker, bitShake, DTU, Home AssistantShelly, EcoTracker, bitShake, DTU, Home AssistantShelly, EcoTracker, bitShake, DTU, Home Assistant
Schutzklasse
IP65IP65IP44
Betriebsumgebungstemperatur
-20 °C bis 45 °C (20 °C bis 30 °C ist optimal)-20 °C bis 45 °C (20 °C bis 30 °C ist optimal)-20 °C bis 40 °C, 10 bis 90 % r. F. Temperaturbereich & Heizfunktion
Kompatibilität
  • Deye

  • SUN-M(60-200)/G3-EU-Q0
  • SUN-M(60-200)/G4-EU-Q0
  • SUN800G3-EU-230
  • Hoymiles

  • Hoymiles HM-600-2T
  • Hoymiles HM-800-2T
  • Hoymiles HMS-600-2T
  • Hoymiles HMS-800-2T
  • APS

  • EZ1-M
  • TSUN

  • G3
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Kompatibilität zwischen Plus-Version und 1. Generation

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Grundlegende Kompatibilität zwischen Plus-Version und 1. Generation

Grundsätzlich sind beide Speicher-Versionen miteinander kompatibel. So kann zum Beispiel ein BK215 mit einem oder mehreren B215 Plus Speichern betrieben werden. Ein BK215 Plus kann hingegen keine B215 Erweiterungsspeicher steuern.

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Einschränkungen bei der physischen Erweiterbarkeit

Bei der physischen Erweiterbarkeit gibt es aber eine Einschränkung. So kann ein regulärer BK215 Kopfspeicher weiterhin nur drei B215 Erweiterungsspeicher steuern. Dies ändert sich auch durch das Hinzufügen eines oder mehrerer B215 Plus Erweiterungsspeicher nicht. Für die volle, physische Erweiterung der Gesamtspeicherleistung auf mehr als 8,6 kWh sind somit Speichertürme aus Plus-Speichern Voraussetzung.

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Smarte Multi-Bereiche-Strategie für Speichertürme-Kombination

Über die smarte Multi-Bereiche-Strategie können aber weiter problemlos mehrere Speichertürme in einem Steuerbereich per App kombiniert werden, die dann gemeinsam basierend auf den Daten eines Energiemessgerätes gesteuert werden.

Compatible with the SunEnergyXT-App

Adjust the feed-in anytime and anywhere via our SunEnergyXT-App​​

The SunEnergyXT-App makes it easy for you to track and optimise the solar energy production of your system.

App User Manual (PDF)

Germany-based customer support

A device is only as good as its support:​​

We place great importance on fast service and are here for you — via our support center, by email, and by phone. Do you have any questions or need assistance with the setup or operation of your SunEnergyXT system? Then reach out to our team via the following link:

CUSTOMER SUPPORT TICKET

Consultation Enquiry

Do you still have questions regarding our energy storage units or you would like to have a personalised consultation?

Please contact us via the form below and we will call you back shortly.

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Utilise your solar power potential to the fullest!

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