Ultralight 403

Ultralight outboard, 1 HP equivalent, with integrated 320 Wh high performance lithium battery, including charger, remote throttle, GPS-based range calculation, multifunction display, on/off magnetkey and drybag

$1,799.99 Add to Cart

Product Specifications

Weight 24
SKU 1403

A motor on a kayak? Awesome! Because it’s not just any motor, it’s the Ultralight 403 and weighs just over 15 lbs including the battery and throttle. So it doesn’t restrict performance when paddling, but pushes when it’s needed: against the current, against the wind and against tired arms. Plus, it’s perfect for hands-free fishing and trolling – because it gives you the right amount of power to get you where you need to be. Quietly! And when it drives, it drives properly.

There’s not only more power in this lightweight motor than you’d think at first sight, but it also demonstrates real endurance, taking you up to a full 26 miles on a single charge at an average speed of 2.5 mph (depending on the boat). Which can be done simply and precisely because the throttle display shows the precise speed over ground – just one of four values that the integrated on-board computer always has ready. In addition, battery charge status and remaining range are available at any time, together with conditions such as current and tides taken into account. And if the range isn’t sufficient for you, just take the solar panel on board and you can charge as you go.

With the included mounting ball, the Ultralight fits almost every kayak. All components – motor, battery and throttle – are completely waterproof to IP 67. So whether you’re on inland water or the sea, the Ultralight 403 is the ideal companion for every trip into the blue


 Key Features:

  • total weight 15 lbs including battery

  • maximum speed 5.5 - 6 mph (boat dependent), faster than any trolling motor

  • range at lower speed 26 miles (boat dependent)

  • completely waterproof (IP 67)

  • precise GPS-based calculation of remaining range

  • solar rechargeable – including during the voyage

Speed, Range, Run Time

integrated battery (29.6 V / 11 Ah)

Fishing kayak (Hobie Mirage Revolution), 13.4 ft, 58 lbs

Speed in mph Range in miles Run time in hours
Slow speed 2.6 21.8 8:20
Half power 3.7 15.5 4:10
Full power 5.8 4.6 0:48

Touring kayak (Prijon Prilite T470), 15.4 ft, 50.7 lbs

Speed in mph Range in miles Run time in hours
Slow speed 2.6 26.1 10:00
Half power 3.8 16.1 4:10
Full power 6.1 4.8 0:48

Usage Info

Mounting: 4 mounting options are available.
1. For use with Hobie kayaks, we recommend the Hobie “eVolve” available through Hobie dealers.
2. For use with Grabner kayaks, please use Grabner mounting kits.
3. For use with Prijon kayaks, please use the Prijon rudder mount.
4. All others: by using the mounting ball provided, the Ultraligth 403 can be easily mounted on almost any kayak.

Steering: The Ultralight 403 can be attached to the kayak’s steering system/rudder.

Safety: The motor shuts off when the magnet key is removed from the remote throttle control. The motor only runs when the magnetic key is placed in position on the throttle and stops immediately when the key is removed. For safety reasons, the magnetic key should be attached to your wrist or life vest. If the kayak capsizes, the motor shuts off automatically to avoid possible injury.

Battery charging: When fully discharged, the charge time with the charger supplied is approximately 12 hours.

Solar charging: A 45 W solar panel is available as an accessory.

Lithium battery life expectancy: The life of a lithium battery is barely affected by charging cycles. It has no memory effect. Therefore, the battery can be fully recharged after every trip, regardless of the charge status
shown on the display. Generally, a loss of capacity of 4% per year can be expected. Ageing is accelerated if the battery is exposed to high temperatures for long periods while fully charged.

Our recommendation: The battery can be used in very hot conditions but should be stored in a cool place away from the sun when not in use. 8 years after date of production, your battery needs to be inspected by a service center.

Speci?cations integrated battery: The integrated battery has a capacity of 320 Wh, i.e. 11 Ah at 29.6 V.

Limited warranty: 2 years.

Technical Data

Input power in watts 400
Propulsion power in watts 180
Comparable petrol outboards (propulsive power) 1 HP
Comparable petrol outboards (thrust) 2 HP
Maximum overall effiency in % 45
Static thrust in lbs* 33
Integrated battery 320 Wh Li-Ion
Nominal voltage 29.6
Final charging voltage 33.6
Total weight in lbs 16.3
Motor weight without battery in lbs 9.9
Weight of integrated battery in lbs 6.4
Shaft length in inches 18.5
Standard propeller
(v = speed in km/h at p = power in watts)
Maximum propeller speed in rpm 1,200
Control Remote throttle
Steering Provision for connecting to kayak rudder, lockable
Tilting device Manual with grounding protection
Stepless forward/reverse drive Yes
Integrated on-board computer with display Yes

* Torqeedo static thrust measurement is based on internationally accepted ISO standards. Static thrust figures for conventional trolling motors are typically measured differently, which results in higher values. To compare Torqeedo static thrust data with conventional trolling motors, add approximately 50% to the Torqeedo static thrust values.