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FAQ´s BMZ Energy Storage & Online-Shop

Welcome to our FAQ area. Here you will find relevant information and support for our products.
We always try to offer you the best possible service. For this reason, our FAQ area is continuously being expanded and further developed.

1. Which inverters are the BMZ ESS 7.0/9.0/X energy storage systems compatible with?

Answer: ESS 7.0/9.0/X are compatible with the following inverters:
- SMA Solar: Sunny Island 3.0M/4.4M/6.0H/8.0H
- Victron Energy: Multiplus, Multigrid, Quattro, Easysolar ( 48V)
- Delios: DLS 600/DLS 450/DLS300/DLS C

2. May I extend or shorten the cables of the BMZ ESS 7.0/9.0/X energy storage devices?

Answer: No. ESS 7.0/9.0/X comes with 2m DC connection cables. These cables must not be changed. If several energy storage devices or several inverters are connected in parallel, a bat-breaker box must be used (see operating instructions).

3. Why isn’t the entire nominal capacity of the energy storage of BMZ ESS 7.0/9.0/X usable for the operator?

Answer: BMZ has installed capacity reserves to protect the battery from overvoltage and undervoltage and to ensure the long life of the battery system. This is a quality feature of the BMZ energy storage devices.

4. How often can I charge/discharge the ESS system? How many charging cycles does BMZ guarantee? What is the product’s lifetime?

Answer: BMZ guarantees 5000 charging/discharging cycles and a product lifetime of up to 20 years. Partial cycles are added up to full cycles.

5. How does BMZ’s ESS differ from competitors’ devices?

Answer: It is one of the most powerful battery systems on the market which can be flexibly expanded.

6. Are there subsidies that I can apply for? Where do I apply?

Answer: Yes. Ask your banking institution about KfW-Programme 275 subsidies for energy storage systems.

7. Which warranties does BMZ provide?

Answer: You receive 2 years legal warranty on your storage system and a 10 year market value replacement warranty on cycle stability (5000) and guaranteed residual capacity of at least 60%.

8. What is the power output and capacity of BMZ’s ESS storage systems?

Answer: Each module is capable of 16kWh. Up to 12 modules can be clustered for a total output of 102kWh.

9. How much do I pay for a one stored kWh in relation to my purchase price?

Answer: One stored kWh is less than 25 cents.

10. Can I extend my battery capacity even after years?

Answer: BMZ recommends to expand within one year.

11. Can the system be used as stand-alone and/or a back-up (emergency power system)?

Answer: Yes, with the respective converter.

12. Is the ESS system suitable for both, new and existing systems?

Answer: The system can be integrated into both, existing and new installations.

13. How complex is the installation?

Answer: Depending on the system version, installation will take only a few hours (DC/AC).

14. What happens to the battery at the end of use?

Answer: The battery needs to be recycled.

15. Is the ESS battery technology safe?

Answer: BMZ ESS systems are protected by multiple safety levels for maximum safety.

16. Is the ESS battery system "smart home ready"?

Answer: Yes, the system is ready and offers all possibilities via CAN-communication.

17. What happens in case of a complaint or service case?

Answer: BMZ will assist you with its own service network. Central Service is one of Europe's largest service centers for battery systems. If you have any questions about our service or a complaint, you can contact us any time via e-mail:

18. When will the new high-voltage system "Hyperion" be available?
Answer: Series start: July 2020 with a delivery time of 4-6 weeks. However, you can reserve the Hyperion with us in advance. As soon as the Hyperion is available, we will notify you immediately. For further information about the new high-voltage system "Hyperion" please send us an e-mail:
19. When will the new module "Helios" be available?
Answer: Series start: July 2020 with a delivery time of 4-6 weeks. However, you can reserve the module with us in advance. As soon as the Helios module is available, you will receive an immediate notification from us.
20. What advantages does the BMZ B2B online shop offer?
Answer: In our B2B online shop you can order the above product range at any time.
In our product overview you will find ultra-modern energy storage systems "Made in Germany", compact battery fuses, the BMZ communication kit and accessories including all the relevant technical data and recommendations for suitable components for your best price-performance ratio. Order around the clock!
21. Who can order from the BMZ B2B online shop?
Answer: In our B2B online shop, commercial customers can order the above product range. To register as a dealer, you need a trade licence and, for companies abroad, a valid VAT ID.
22. Can I send the order to another delivery address?
Answer: This is no problem in our B2B online shop. In the ordering process you have the possibility to specify a different delivery address.
23. What are the shipping costs?
Answer: The amount of shipping costs can vary depending on the order for dangerous goods and are calculated on the basis of the number of pallets. Per pallet within Germany 89,95€ and shipping international (EU) 149,95€. Possible disposal costs are not included in the price and will be invoiced separately.
24. Is there a minimum order value in the B2B-Onlineshop?
Answer: No, we do not have a minimum order value for our products.
25. What are the possibilities to place an order?
Answer: Order in the shop 365 days 24 h:
Order by mail 365 days 24 h:
26. What does the offer and pricing look like in the shop?
Answer: Our offer is intended for commercial customers. Our customers from the trade get after successful registration the net prices plus the legal value added tax indicated. The prices understand themselves excl. forwarding expenses and possible resulting disposal costs.
27. Can I also contact BMZ personally?
Answer: You are very welcome to do so. Should your questions not be answered here in our FAQ section, please either use our contact form in the B2B shop or call us Monday to Friday from 08:00 to 16:00 on 06188 9956-0.
For technical questions, please use our contact form in the shop.
28. Where can I get software Update´s or current drivers for the energy stores?
Answer: With the ESS service tool developed by BMZ, you as a dealer can install the latest company software versions, obtain current drivers, technical data sheets and much more. All information about the ESS Service Tool and how to register is available here:
+49 (0) 06188 9956-9830
29. What exactly is an inverter?
Answer: The inverter converts the direct current generated in the photovoltaic cells into grid-compliant alternating current. Either for own consumption or for feeding into the public grid. In our shop we offer you the high-quality inverters from our partner "Delios". Further information about our inverters can be found in our shop: Products - Inverters.
30. How can I register in the B2B shop?
In our B2B-Onlineshop commercial customers can order the mentioned product range. To register as a dealer, you need a trade licence and, for companies abroad, a valid sales tax ID (VAT). For this you fill out completely the new customer application and you receive within shortest time, a feedback with the necessary information for the activation for the B2B-Onlineshop. You can register under the following link:
31. Can I register in the B2B shop if my business is not registered in the EU?

Answer: No, unfortunately this is not possible.

32. How does the order process work?

Answer: In our ESS shop you can choose from a wide range of products. To place an order, you have to go through the following steps:

Choose a product

Answer: After your registration in our ESS shop and after you have chosen the product of your choice click on the button "Add to cart". Now you have put the product into the shopping cart without obligation. You can access the shopping cart at any time by clicking on the shopping cart symbol in the top right-hand corner of the screen. All the products in your shopping cart will be listed and you can remove products from your list or change the quantity by clicking on "Empty cart". If you have a voucher, you can redeem it under "Enter voucher code".

Place an order

Answer: Please tap on the field "Checkout" and enter your billing and delivery address in the mask and then click on the button "Continue". In the next step, the shipping method is displayed, i.e. how the goods will be sent to you. Here please click on "Next" again.

Summary of your order

Answer: By clicking on the field "Further information" you have the possibility to inform us about preferred delivery times or similar. We try to consider your wishes according to our possibilities. Please check your order again and click on "Place order" to complete your order.

Confirmation of your order

Answer: You will receive an automatic confirmation of receipt by e-mail after your order for your information, a separate order confirmation in which the information of your order is listed again.

33. I do not live in Germany, can I still order from the ESS shop?

Answer: Yes, we deliver not only to Germany but also to all EU countries and Switzerland. Please note that the delivery costs per country may differ. You can find a list of delivery costs and other fees here:

34. Where can I enter my voucher code?

Answer: In the shopping cart, you will find a field in the lower left corner marked "Enter voucher code". There you can enter and confirm the corresponding code. For technical reasons it is unfortunately not possible to redeem a voucher after an order has already been sent.

Please note that only 1 voucher can be redeemed per order.

35. Where can I find my order?

Answer: You can find your orders under "My Account - Order History".

36. Can I also make larger orders? Example 200 pieces per article?

Answer: Yes, this is possible.

37. Is it possible to get a tracking number from you?

Answer: With pleasure on request. Please send us a short e-mail to: 
Please note that it can take up to 12 hours until the data of your shipment is visible.

38. Is it possible to pick up the ordered goods yourself?

Answer: Unfortunately it is not possible to collect the ordered goods yourself.

39. Is my personal data safe?

Answer: The security of our customers' personal data is our top priority. For this reason we guarantee that all transactions through the BMZ B2B ESS shop are protected by SSL encryption technology. By using this technology, the order information is sent encrypted to protect it from unauthorized access. All common browsers (e.g. Google Chrome, Firefox, Safari) support SSL.

40. I am already a BMZ customer, but I have never ordered online before. What do I have to consider before my first online order?
Answer. If you have previously ordered by phone or e-mail and would now like to use the convenient online ordering option, you must register once in the ESS shop. To do this, please use the "Register" tab at the top right of the ESS shop. Click on "Register" in the input window and then follow the instructions. Even if you already have a BMZ customer number, registration in the ESS shop is still necessary. Please note that we need about 24 hours to activate you for the ESS shop.
41. How can I delete my user profile?
Answer: You yourself have no possibility to delete your user profile irrevocably. We take over this task for you. Simply send us an informal e-mail with the subject "Delete ESS online shop user profile".
42. I have a new e-mail address and would like to log in to the member area in the ESS shop with this e-mail address. How do I change my e-mail address?
Answer. Under My Account Dashboard you will find the function "E-Mail" in the text field where you can change your e-mail address. Under the item Change password, you can choose a new password and save your changes.
43. I was about to log in to the ESS shop, but unfortunately I can't find my password anymore.
Answer. If you have forgotten your password, please ask for a new password after failed LOGIN by using the function "Forgot password".
44. What is the quickest way to find out what is new in the ESS shop?
Answer. You can get a detailed overview of all new articles and information about the ESS shop by clicking on the "News" button at the top of the navigation bar and on the "ESS Shop News" button at the bottom of the navigation bar. With our e-mail newsletter, we also keep you up to date on the latest offers and special highlights without obligation and free of charge. By simply clicking on Send when registering under "My Account Personal Information", you can subscribe to the newsletter free of charge and without obligation.
45. how does the login/logout work?
Answer: In order to log in to the ESS shop, please go to the menu symbol "Login" in the upper right corner and enter your e-mail address and the password you have created. To log out of the ESS shop, click on the "Log out" menu symbol at the top right. If you click on it, you are automatically logged out.
46. Why is my e-mail address not accepted?
Answer: First check if your e-mail address is spelled correctly and if it has a valid e-mail format. If your e-mail address is not accepted despite correct spelling, there may already be a profile with your e-mail address. You can then have a new password sent to you and continue to use your profile.
47. am I always automatically registered in the ESS shop?
Answer: No. In order to place an order or view prices, for example, you must log in to the ESS shop again with your access data.
This also applies if you want to log in via smartphone.
48. Why did I not receive a registration confirmation by e-mail?
Answer: Please check the spam folder in your e-mail inbox. The activation mail " dealer account is activated" was sent to you by the sender The e-mail is usually sent within a few minutes after activation.
49. how can I log out of the ESS shop?
Answer: You can actively log out of the ESS shop at any time. To do so, please go to the "Logout" menu icon in the upper right corner. If you click on it, you are automatically logged out.