Dual-mode NRF/CMT DTU for Hoymiles HM 300-1500, HMS 300-2000 and HMT 1800-2250 with Display
📦 Location of the warehouse: Munich
🚚 We will ship your order within 24 hours after the order is taken.
- Pre-Ordering: If an item is unavailable, you can pre-order it. We'll dispatch once stock is replenished, usually within 10 working days.
- Express Shipping: Need it faster? Contact us via email or through our live chat support, and we'll arrange expedited delivery for you.
Free Shipping from 30€ in Germany, 50€ in the EU!
- EU Countries Delivery Time: 4~8 working days.
- Other Countries Delivery Time: 2~2.5 weeks.
Free shipping for you
Free Shipping from 30€ in Germany, 50€ in the EU!
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Dual-mode NRF/CMT DTU for Hoymiles HM 300-1500, HMS 300-2000 and HMT 1800-2250 with Display
The Dual-mode NRF/CMT DTU module comes with pre-installed latest version of OpenDTU firmware. The DTU module is designed for easy management and optimization of the HM, HMS, and HMT series of the Hoymiles inverters simultaneously, except the inverters with a “W” in the model number. Up to ten inverters can be connected.
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Built-in NRF24L01+ AND CMT2300A IoT modules
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Display and adjustment of current inverter limits
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Switching inverter on and off
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Support for multiple inverters (up to 10 inverters)
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Supports MQTT with TLS encryption
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Integration with Home Assistant MQTT auto-discovery
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User-friendly web application with real-time data visualization
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Firmware updates via web interface
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Support for different time zones
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Multi-language web interface (English, German, French)
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Prometheus API extension (/api/prometheus/metrics)
After connecting a power supply (5V-2A，€ 4,99) via a USB-A to USB-C cable(€ 2,99 ), the DTU is recognized as an access point (AP). After entering the IP address and password, the DTU can be set up. Instructions are provided. If you need help with the setup, please contact us via email or whatsapp.
The 5V-2A power supply and the USB-A to USB-C cable are not included in the standard package to protect the environment, and they can be ordered as accessories.
Compatible Inverters Models using NRF24L01+ module (included already in this product):
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Hoymiles HM-300-1T
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Hoymiles HM-350-1T
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Hoymiles HM-400-1T
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Hoymiles HM-600-2T
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Hoymiles HM-700-2T
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Hoymiles HM-800-2T
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Hoymiles HM-1000-4T
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Hoymiles HM-1200-4T
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Hoymiles HM-1500-4T
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Solenso SOL-H350
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Solenso SOL-H400
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Solenso SOL-H800
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TSUN TSOL-M350
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TSUN TSOL-M800
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TSUN TSOL-M1600
Compatible Inverters Models using CMT2300A module (included already in this product):
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Hoymiles HMS-300-1T
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Hoymiles HMS-350-1T
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Hoymiles HMS-400-1T
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Hoymiles HMS-450-1T
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Hoymiles HMS-500-1T
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Hoymiles HMS-600-2T
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Hoymiles HMS-700-2T
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Hoymiles HMS-800-2T
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Hoymiles HMS-900-2T
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Hoymiles HMS-1000-2T
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Hoymiles HMS-1600-4T
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Hoymiles HMS-1800-4T
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Hoymiles HMS-2000-4T
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Hoymiles HMT-1600-4T
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Hoymiles HMT-1800-4T
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Hoymiles HMT-2000-4T
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Hoymiles HMT-1800-6T
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Hoymiles HMT-2250-6T
Set up your device:
- Power on the DTU – Once connected to power, it will generate a WiFi network starting with "openDTU".
- Connect to the WiFi – Select the "openDTU" network and use the password: openDTU42.
- Log in – Open a browser and go to 192.168.4.1. Use the following credentials:
- Username: admin
- Password: openDTU42
- Configure Home WiFi – In the settings, enter your home WiFi name and password.
- Find the Device IP – After setup, the OpenDTU screen will display the new IP address assigned by your router.
Still have questions? We are happy to help! Please simply write to us via email or whatsapp.
1. General Shipping Information
- We provide premium shipping methods with a tracking number for each order.
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Shipping address should be input in English without any special symbols to help the courier company recognize your address in the system. We will ship according to the shipping address you provided. Please notify us of any address change before your order is marked "Shipped" to avoid parcel loss.
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Please contact our customer service staff immediately if you need to cancel or change an order. Once your order has reached "Shipped" status, it can no longer be canceled or changed in any way. To avoid complications, please recheck your shopping cart before checkout.
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We can ship all in-stock orders within 1 business day as your order has been confirmed.
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All items are inspected before dispatch and are carefully hand-packed.
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With standard courier practice, you need to check the contents of the parcel before signing for your goods. Otherwise, we will not be held responsible for any damage that may have occurred in transit.
2. Shipping Options for Germany and EU* countries
(For Products in Munich Warehouse)
2.1 Shipping options for an order value of up to €30 inside Germany or €50 inside the EU*
Shipping Options:
| Shipping Options | Germany | EU* |
|---|---|---|
|
Deutsche Post |
€3.5 Arrive in 3-4 Business Days |
€6 Arrive in 5-9 Business Days |
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DHL Paket |
€6 Arrive in 2-3 Business Days |
€15 Arrive in 3-7 Business Days |
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DHL Express |
€14 Arrive in 1-2 Business Day |
€65 Arrive in 2-3 Business Days |
2.2 Free shipping options for an order value of above €30 inside Germany or €50 inside the EU*:
| Free Shipping Options | Germany | EU* |
|---|---|---|
|
Deutsche Post |
Free Above €30 | Free Above €50 |
|
DHL Paket |
+ €2 for Above €30 / Free Above €60 | + €8 for Above €50 / Free Above €80 |
|
DHL Express |
+ €10 for Above €30 | + €60 for Above €50 |
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Certain EU Countries are not included in our EU Zone definition: United Kingdom (excluding Ireland), Switzerland, Liechtenstein, Vatican City, Albania, Belarus, Norway, Ukraine, and Iceland. For the above countries, the International Shipping Rule applies.
2.3 Shipping Options for International Countries:
(via Deutsche Post or YunExpress)
| Order Amount | International |
|---|---|
| €0 - €15 | €8 |
| €15 - €30 | €7 |
| €30 - €50 | €6 |
| €50 and above | €4 |
Important Notice:
- Please verify the inventory location on the product page before placing your order to confirm delivery timeframes.
- For products in the Shenzhen warehouse, we will typically first ship the products from the Shenzhen warehouse to our Munich warehouse, which will take around 1.5 weeks. After we receive the shipment in Munich, we will send the items to you. We will only arrange YunExpress shipping from Shenzhen for orders with products in the Shenzhen warehouse worth more than €50.
- If you place an order with products from both Munich and Shenzhen warehouses, we will first ship the products in the Munich warehouse, and then send the remaining products to you when we receive them from Shenzhen.
3. International Warehouse
Our products are stored in both our Munich and Shenzhen warehouses to provide more flexible logistics solutions tailored to different regions and customer needs. On each product's description page, we indicate the specific warehouse location to help you better plan your purchase and delivery schedule.
3.1 German Warehouse
For products stored in our warehouse in Munich, we use either Deutsche Post or DHL for shipping, depending on the size of the package. Logistics within Germany are very efficient, with an estimated delivery time of 2-4 business days, ensuring you receive your order quickly and conveniently. For Western EU countries, the estimated delivery time is 4-6 business days. For Eastern EU countries, the estimated delivery time is 6-8 business days.
3.2 Chinese Warehouse
We will only arrange YunExpressexpress shipping from Shenzhen for orders with products in the Shenzhen warehouse worth more than €50. Orders directly shipped from our Shenzhen warehouse are handled by YunExpress. Given the complexities of international shipping, the estimated delivery time for these packages is around 10 business days, though this may vary slightly due to customs processes or other uncontrollable factors. Otherwise, the products will first be shipped from China to our Munich warehouse and then shipped to the final destination.
To ensure that your order is delivered within your desired timeframe, we recommend reviewing the warehouse information provided on the product pages before placing your order and selecting the appropriate shipping option. If you have any questions or need further assistance, please don't hesitate to contact our customer support team—we are here to help you!
4. Customs and Taxes
4.1 How are customs handled by OpenELAB for import or export?
Whether shipped from Germany or China, we cover all import duties and taxes, ensuring that you receive your package without any additional costs or hassle with customs.
4.2 How is VAT charged when the Customer places an order from OpenELAB?
In accordance with the newest VAT e-commerce rules in the EU, OpenELAB shall have the right to charge the amount of VAT. The standard rate of actual VAT applied is subject to the European government's freedom to set the number and level. Such an amount of VAT will be charged when you place an order from OpenELAB. Please contact OpenELAB if you have any questions when you pay such VAT.
4.3 What kind of fee will be charged except VAT?
Except for the VAT, OpenELAB will charge any handling fee when you are placing any purchase orders, which includes but is not limited to customs duty, import VAT, freight costs, etc. Customs duty and import VAT will be paid on the importation of goods from outside the EU into an EU country, and such amount is calculated as a percentage of the customs value of goods. Please note that it may take 1-2 working days for Deutsche Post/DHL/FEDEX or 3-4 working days for YunExpress for the status to update.
Effective Date: March 27, 2025
At OpenELAB, we are committed to providing accurate product descriptions and delivering high-quality products. If you experience any issues with your purchase, please notify us within 60 days of the shipment date.
1. Warranty Disclaimer
Unless explicitly stated in a specific agreement or purchase order, OpenELAB makes no warranties—express or implied—regarding the fitness, suitability, or merchantability of any product for a particular purpose or special use.
2. Warranty Policy
Warranty Period
The standard warranty period for products sold by OpenELAB is 12 months from the date of delivery.
Under this warranty, OpenELAB will make a reasonable effort to repair or replace products free of charge if defects are due to issues with raw materials, design, or manufacturing.
If the defect qualifies under this policy but falls outside the covered scope, reasonable charges may apply for repair or replacement.
After the warranty period, support may still be available at a reasonable fee.
Warranty Exclusions
The warranty does not apply in the following cases:
- The product is beyond the 12-month warranty period.
- Damage due to misuse, improper maintenance or storage, or failure to follow the user guide or manual.
- Issues caused by Force Majeure events (e.g., natural disasters, war, legal changes, etc.).
- Unauthorized repair attempts by the customer.
- The product is not defective but has been opened and is non-returnable by policy.
3. Returns & Refunds
If you're not satisfied with your purchase, you may be eligible for a return or exchange:
- Return for Refund: Within 15 days of receipt (unopened).
- Return for Replacement: Within 30 days of receipt (damaged or defective).
- Exchange Window: Up to 30 days from receipt.
Please email us at info@openelab.io for a return authorization before sending anything back.
Return Conditions
- Items must be in original, clean, and mint condition with packaging intact.
- Returns of damaged, used, scratched, modified, or programmed items will not be accepted.
- Include the receipt, a brief note with your name, order number, and reason for return.
Shipping & Fees
- Customers are responsible for return shipping to our warehouses in Europe, the US, or China.
- Refunds may be subject to additional shipping fees unless the return is due to our error.
- A flat €8 shipping fee will be deducted for returned items that originally qualified for free shipping.
Payment Platform Fees
For refunds processed through third-party platforms such as PayPal or Braintree, a standard 3.5% service fee may be deducted to cover payment processing costs.
