KOLLTER ES-1 PRO

Overview

Overview

KOLLTER ES-1 PRO is a dirt bike that is similar in size to the largest dirt bikes like Honda CRF450, Yamaha YZ450F, KTM and Husqvarna Enduro and most ICE dirt bikes in the 350 – 450CC range. In terms of weight it is also comparable. But there are two essential differences from the ICE bikes – it is quiet and has no clutch, no gears. The central axial flux motor provides an instant torque and like the superior acceleration of electric cars to gas ones, this dirt bike also outperforms many ICE dirt bikes. And when we talk about comparison, we should mention that KOLLTER ES-1 PRO also outperforms many electric dirt bikes currently on the market either with range, power and with price.

The previous version of this bike was initially introduced to the European market in 2019 under two OEM names Tinbot and Horwin both in off-road and city versions. The difference, however with earlier versions is that the new version is twice more powerful than 2019 version, its speed is 100 km/h compared to 45 km/h for the previous version and has two removable batteries working in parallel. The two batteries make its range for off-road and the road version up to 120km and can be charged for less than 4 Hrs.

Motor

It is the latest technology axial flux motor – 72V, 10kW, 5,100 RPM motor with integrated gear box providing 220 Nm peak torque that makes this bike capable to accelerate with a twist of the throttle at any given speed “without changing gears”.  Axial flux electric motors have one of the highest usable power and torque densities of any electric vehicle drive motor available on the market today as opposed to the common radial flux. Because of this they can deliver the most power in the smallest package possible. The high RPM ensures is a reason for the immediate torque on start and the low battery consumption rate as the motor efficiency is always maintained.

It might only have 6000W of power, but…that amount of power is packaged in a light and well-designed frame that can take hard off-road jumps with ease. By having a large RPM reduction between the motor and rear wheel…the amp-draw demands on the battery are lowered, and the motor also runs cooler.  The power from a standstill is enough so that you can wheelie it if you want to, but it does not unintentionally wheelie. The rear wheel is driven by a massive chain that looks unlikely to break even at the claimed 6000 Watts peak power that the motor puts out.

Axial flux electric motors have the highest torque to power ratio compared to any electric vehicle with radial flux drive available on the market today. Because of this they can deliver the most power in the smallest package possible.

Battery and Charger

With high discharge ratio 18650 battery cells, high power BMS, SOC battery statistics, 4 temperature sensors real-time monitoring, and host computer management process and data interface, it enables the battery to have the excellent high ratio load capacity, longer life time, and high safety and reliability. The two removable batteries are manufactured with the same cells as the ones used in the famous Sur-ron and Segway dirt bikes but they are 72V with combined capacity of 4.7 kWH compared to 2kWH of the sur-ron bikes.

The enormous 4.7kWH capacity of the dual pack ensures 130km range on a full charge.

The cells are rated for high discharge rate that allows continuously to be used at the maximum power without affecting their life.

These batteries also can be charged with higher current and therefore the bike comes with 15A charger and reduces the charging time in halve compare to any other electric bike that requires 5-6 hrs. The charger is also solid-state built-in cast aluminum case with external cooling fan. And because of the safe high charge current, this battery readily absorb the high current from the regeneration function of the controller more efficiently than any other battery.

Controller

Sine wave controllers are the latest in brushless motor controllers which smooth out many of the rough edges of the old school “square wave” controllers. They ensure silent operation of the motor.

The Kollter controller can be programmed in racing mode for immediate torque, or proportional acceleration for the road legal bikes, resulting in a much smoother and more predictable power curve throughout the entire range of operation.

The controller is designed for Axial flux electric motor resulting in 20% more torque than square wave/radial flux drive train combination.

This controller regenerates the kinetic energy back to the battery when coasting at speeds of over 8mph.  Regen braking puts charge back into your battery and most importantly preserves your brake pads.

You can also turn Regen off by hitting the “eco” switch whenever coasting and you will roll naturally without any regen resistance. This means you can coast like a bike when you want to.