BUSCH + MÜLLER E-Werk Adjustable Dynamo Bike Charger – up to 13.3V / 1.5A

Intro

The E-Werk by Busch + Müller is a fully adjustable dynamo-powered bike charger, designed for riders who need reliable and configurable power on the move.

It’s not plug & play. It’s a technical tool that lets you set voltage and current to match your devices.

Real-world performance

This is about control, not just output.

• starts charging from approx. 8 km/h
• at ~15 km/h → comparable to a standard mains charger
• adjustable output → supports a wide range of devices
• up to 13.3V and 1.5A → significantly more powerful than basic systems

You can charge or power GPS units, smartphones, lights, and other electronics without relying on fixed presets.

What it is and who it’s for

What it is
A configurable dynamo bike charger with adjustable voltage and current, designed for broad compatibility.

Who it’s for

• long-distance touring and bikepacking
• complex setups with multiple devices
• riders who want full control over power delivery
• integration with non-standard electronics

If you want simplicity, look elsewhere.
If you want flexibility, this is it.

Positioning within the B&M range

• USB-Werk → simple, fixed output
• K-Werk → adds powerbank functionality
• E-Werk → adjustable, powerful, advanced

This is the top-tier solution: more flexible, more powerful, more technical.

Why choose it (practical points)

• precise adjustment of voltage and current
• wide compatibility (USB and direct connections)
• effective charging even on long rides
• can also run from other DC sources (e-bike, car battery)

This is a system component, not just an accessory.

Limitations (clear and honest)

• requires setup and configuration
• more complex than USB-Werk or K-Werk
• you need to understand your device requirements

If you want plug & play → not ideal
If you want control → exactly right

FAQ 

Can it charge a smartphone?
Yes, with the correct voltage and current settings.

At what speed does it start charging?
Around 8 km/h.

Is it more powerful than a standard USB charger?
Yes, it can deliver up to 13.3V and 1.5A with adjustable output.

Can it be used with other power sources?
Yes, it accepts up to 50V DC, including e-bike or car batteries.

CTA

Not sure how to configure it or integrate it into your setup?

Get in touch with Bikejamming — we’ll help you set it up properly based on your devices and riding style.

Technical specifications

• Power source: hub dynamo / DC input up to 50V
• Output: adjustable 2.8 – 13.3V / up to 1.5A
• Charging start: approx. 8 km/h
• Performance: at ~15 km/h comparable to mains chargers
• Connections: multiple (USB + adapter cables included)
• Protection: splash- and rain-resistant
• Dimensions: 30 × 35 × 15 mm
• Weight: 57 g
• Material: plastic
• Certification: StVZO approved

Build & compatibility

• compatible with standard hub dynamos (e.g. SON, Shimano)
• extensive accessory set included
• universal connection options (USB and direct wiring)
• easy mounting on bicycle frames
• water-resistant cable connections