Frequently Asked Questions

Answers regarding DC/DC voltage converters, installation, ordering, shipping, and service

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Here you will find answers to frequently asked questions about our products and customer service. For an individual technical recommendation, please send us the article number and a short description of your application.

Produktwahl und technische Grundlagen

Which DC/DC voltage converter do I need?

For the selection process, we require:

  • the full input voltage range,
  • the desired output voltage,
  • the maximum current or power requirement,
  • information on whether galvanic isolation is required,
  • a brief description of the application.

Please send these details, along with the desired quantity, to info@bauer-united.com. We are happy to assist you with your selection.

Why must the entire input voltage range be considered?

The input voltage must not exceed the permissible range of the converter at any time. Therefore, take into account not only the nominal voltage, but also voltage spikes, charging voltages, and possible open-circuit voltages.

 

For solar modules, the maximum open-circuit voltage at low temperatures is particularly critical.

Can I connect a DC/DC converter directly to a solar panel?

Our DC/DC converters do not have MPPT control. When connected directly, the optimal operating point of the solar module is therefore not automatically tracked.

Important: The DC/DC converter must not be connected between the solar module and the MPPT controller.

For stable and efficient operation, we recommend a suitable solar or MPPT controller, or a battery power supply with an upstream solar controller.

Why is my smartphone charging slowly despite using a 5V/3A adapter?

The specification 5 V/3 A describes the maximum output power of the converter. However, a pure voltage converter does not automatically support the charging protocols of the connected smartphone.

 

As a result, the device may draw a significantly lower charging current. For smartphones and other USB devices, we recommend models with integrated USB charging electronics and appropriate charging protocol support.

Can a 5V/3A converter fast-charge a smartphone with 30 W?

No. At 5 V and a maximum of 3 A, the output power is at most 15 W. Depending on the smartphone, cable, and charging protocol, the actual power drawn may be even lower.

What does "galvanically isolated" mean?

In an isolated DC/DC converter, there is no direct electrical connection between the input and output. This may be necessary, for example, to avoid ground loops or in electrically separated circuits.

 

Whether an isolated model is required depends on the specific application.

Installation und Fahrzeuganwendungen

How must a voltage converter be fused?

The positive line should be fused as close as possible to the voltage source or the vehicle electrical system connection point. The fuse and cable cross-section must be suitable for the maximum input power, cable length, and installation.

 

If you are uncertain, please send us the item number along with details regarding input and output voltage, power, and cable length.

Can I use the BMW Cartool connection kit on my motorcycle?

Our connection kit is designed for the original three-pin Cartool socket. Plugs on navigation mounts or mounting blocks may differ.

 

BMW has changed the polarity several times over the model years. Therefore, please check the positive and negative terminals with a multimeter before connecting. The converter features reverse polarity protection. If you are unsure, you can send us photos of the plug and the connection side.

Which charger is compatible with my LiFePO₄ battery?

The voltage and charging profile of the charger must match the battery chemistry and nominal voltage. In addition, the charging current must be within the specifications of the battery or BMS manufacturer.

 

The battery capacity mainly affects the charging time. If you are unsure, please send us the voltage, capacity, battery type, and the recommended maximum charging current.

Fehler, Reklamation und Rückgabe

What should I do if a product does not work?

First, disconnect the product from the power supply and do not use it again until the issue is resolved. Then, please send us:

  • Order number and source of purchase,
  • Item number,
  • A detailed description of the fault,
  • Information regarding input and output voltage,
  • If possible, photos and measurement results.

After reviewing your request, we will inform you of the next steps, such as a replacement or refund.

What should I do in the event of overheating, smoke development, or damage?

Disconnect the product from the power supply immediately and do not put it back into operation.

Please keep the device, the packaging, and any affected connecting cables for potential inspection. Send us photos, order information, and a description of the setup. We will then coordinate the return and further processing with you.

Can I cancel an order?

Please contact us as soon as possible, quoting your order number. As long as the order has not yet been shipped or finally processed, we will check whether a direct cancellation is possible.

If the goods are already in transit, please coordinate the return with us in advance.

What should I do if an item is incorrect, missing, or damaged?

Please send us the order number as well as photos of the product received, the packaging, and the shipping label. We will review the matter and, depending on the case, organize a replacement shipment, an exchange, or a refund.

Geschäftskunden, Versand und EU

Do you offer quotes and volume discounts for business customers?

Yes. We create individual quotes for business customers and offer volume-based tiered pricing.

Please send us:

  • Item number and quantity,
  • Billing and shipping address,
  • Desired delivery date,
  • VAT identification number,
  • If applicable, a desired delivery schedule.

Sample orders and staggered series deliveries are also possible upon arrangement.

Do you also deliver to other EU countries?

Deliveries to numerous EU countries are possible, even if the desired country cannot be selected directly in the online shop.

Please send us your delivery address, billing address, items, and quantity. Business customers should also provide their VAT identification number. You will then receive a quote including shipping costs and delivery time.

Can an EU business customer order be processed without German VAT?

A VAT-exempt intra-Community supply may be possible if the statutory requirements are met and a valid VAT identification number is provided.

Please submit your VAT ID along with your full company and delivery address prior to invoicing.

What payment methods are available?

The available payment methods are displayed in the online shop. For individual quotes, larger orders, and international deliveries, payment is often made in advance based on a pro forma invoice.

The specific payment terms are stated in the respective offer.

Will I receive an invoice and tracking information?

The invoice is usually provided digitally. After shipment, you will receive a tracking number for parcel monitoring, if available.
 

If you require a purchase order reference, cost center, or special billing information, please provide this to us, if possible, before the invoice is issued.