ENGWE L20 Electric Bicycle User Manual

Important Safety Information

When using the electric bicycle, general precautions must be followed, including:

1. Read all instructions.
2. To avoid fire, electric shock, and personal injury, do not immerse wires, connectors, or the electric bicycle in water or other liquids.
3. Supervise the use of the electric bicycle when children are present.
4. Disconnect the charger from the outlet before cleaning the bike or battery, or when the battery is not charging.
5. Do not use the electric bicycle if its wires or connectors are damaged, or if the bike is otherwise malfunctioning. Take the electric bicycle to the nearest authorized service center for inspection, repair, or adjustment.
6. Accessories not recommended by the bicycle manufacturer may pose a risk of fire, electric shock, or personal injury.
7. Protect the electric bicycle from water on snowy and rainy days.
8. Do not let the electric bicycle or charger wires hang over the edges of tables or other surfaces. Do not expose wires to hot surfaces.
9. Do not place the electric bicycle, charger, or battery near an oven or electric or gas heater.
10. When charging the battery, always connect the charger to the battery first, then to the outlet. After charging, disconnect the charger from the outlet first, then from the battery.
11. Do not use the electric bicycle other than as intended.

SAVE THESE INSTRUCTIONS

Technical Specifications

Assembling Your New Electric Bicycle

Note: ENGWE bikes are delivered pre-assembled and tested unless otherwise agreed upon during purchase. If you assemble the bike yourself, follow these instructions. Assemble the bike with the help of an adult or skilled technician. Assembly is easy, as the package includes the necessary tools and only a few parts to install. For more information, visit www.engwe-bikes-eu.com.

Parts of the Electric Bicycle

Figure 1 - Parts of the Electric Bicycle

• 1. Display
• 2. Handlebar
• 3. Luggage Rack
• 4. Headlight
• 5. Front Fork
• 6. Fat Tire
• 7. Pedal
• 8. Crank
• 9. Battery
• 10. Chain
• 11. Freewheel
• 12. Electric Motor
• 13. Taillight
• 14. Seatpost
• 15. Saddle

Check that the package is intact and complete. Your electric bicycle is delivered in a cardboard box containing the following items:

• Electric bicycle frame, with rear wheel, drivetrain, chain, rear brake, battery, rear fender, and kickstand already installed.
• Handlebar, with electrical wires and brake cables connected to the frame. The handlebar is pre-equipped with brake levers, gear shifter, LCD display, and bell.
• Saddle, attached to its seatpost.
• Front wheel.
• Front fender with brackets.
• Luggage rack.
• Headlight, connected to the bike frame via its electrical wire.
• Tools and other parts, such as pedals, charger, and English manuals, are in a separate accessory box.

Figure 2 - Contents of the Accessory Box

Includes: Phillips screwdriver, 8-10mm wrench, 13-15mm wrench, 14-17mm wrench, 4mm Allen key, 5mm Allen key, 6mm Allen key, Charger, Pedals.

Assembly Step 1: Front Wheel

Stand the electric bicycle upright. Remove the transport bolt installed in the front fork and install the front wheel in its place, ensuring the brake disc is on the left side of the wheel when viewed from the rear. Ensure the brake disc aligns correctly between the brake pads. The wheel axle, its sleeves, lock washers, washers, and nuts should be arranged as shown in the figure below.

Figure 3 - Wheel Axle and its Sleeves

Place the lock washers on both sides of the wheel correctly (tang facing "inward") and tighten the nuts with a 15mm wrench. Ensure the wheel rotates freely and does not wobble. Adjust the wheel position if necessary.

Figure 4 - Ensure lock washers are facing correctly and tighten nuts

Test the front brakes by lifting the front of the electric bicycle, rotating the front wheel, and squeezing the left brake lever. If the wheel does not rotate freely or you cannot stop it by applying the brake, the brake needs adjustment by setting the correct clearance between the brake pad and the brake disc.

Warning! Do not use the electric bicycle until you have confirmed that both the front and rear brakes are functioning correctly!

Assembly Step 2: Handlebar

Remove packaging material from around the handlebar. Remove the handlebar clamp from the steering column using a 4mm Allen key.

Figure 5 - Handlebar Installation

Place the handlebar in the center of the steering column and reattach the clamp (A). Do not fully tighten the screws yet, to allow adjustment of the handlebar angle (B).

Figure 6 - Handlebar Attachment and Angle Adjustment

Assembly Step 3: Front Fender

Attach the front fender to the front fork: the fender has a protrusion with a hole for a screw, which passes through the bracket on the front fork and the fender's protrusion. Do not fully tighten the nut yet. Then, attach the side brackets of the fender to the fork using the provided bolts (5mm Allen key). Once all three attachment points are finger-tight, adjust the fender to the correct position and finally tighten the nut and bolts.

Figure 7 - Front Fender Installation

Assembly Step 4: Luggage Rack

Remove four 4mm Allen screws and washers from the front of the frame. Position the luggage rack so it can be attached to the frame. Reinstall the screws and washers.

Figure 8 - Luggage Rack Installation

Thread the wire bundle through the loop behind the luggage rack.

Figure 9 - Thread wire bundle through luggage rack loop

Assembly Step 5: Headlight

Attach the headlight to the luggage rack as shown in Figure 10.

Figure 10 - Headlight Attachment to Luggage Rack

If desired, you can secure the headlight wire to the luggage rack with cable ties.

Figure 11 - Headlight wire can be secured to luggage rack with cable ties

Assembly Step 4: Saddle and Pedal Installation, Tire Pressure

Insert the saddle with its post into the frame's seat tube and adjust the saddle to the desired height using the quick-release lever. If the quick-release lever feels loose, open it and slightly tighten the screw on its side. Test the lever's tightness by re-locking it. Repeat this procedure if necessary until the quick-release lever feels securely tightened. Do not overtighten!

Screw the pedals into place. Note the thread direction on each pedal. The pedal for the left side (when viewed from the rear) has a small "L" letter, and the pedal for the right side has a small "R" letter. Finally, tighten them with a 15mm wrench. Do not overtighten. Due to the thread direction of the pedals, they will not loosen during use.

Check the maximum tire pressure (1.4 bar) on the tire sidewalls and inflate the tires. You can leave the tires slightly softer than the maximum if you want more cushioning.

At this stage, your electric bicycle is functional, except for the battery. Check the tightness of bolts, nuts, and quick-release levers. Take a short ride without starting the electric motor. If necessary, adjust the handlebar and saddle heights and angles for maximum comfort. If the brakes are weak or dragging, adjust the brake clearance. If there are shifting issues or the rear cog makes noise, adjust the rear derailleur settings.

Assembly Step 5: Charging the Battery

Ensure the battery is turned to the "OFF" position with the key. Open the battery charging port cover and insert the charger's charging connector into the port. Plug the other end of the charger into an outlet. The charger's LED light is red when the battery is charging and green when fully charged. Once the light turns green, disconnect the charger from the outlet first, and then from the battery. Close the battery charging port cover.

When the battery is installed in the bike frame and turned to the "ON" position with the key, the battery charge level can be viewed on the LCD display when it is turned on.

You are now ready to start riding your electric bicycle.

Using the Electric Bicycle

Your electric bicycle starts as follows:

I: With the battery installed in the bike frame, insert the key into the battery lock and turn it clockwise until the lock is in the "ON" position. The key should remain in the lock.

II: Press the power button ? on the left side of the handlebar, on the LCD display. Press and hold the button until the display turns on.

III: Start riding by pedaling or twisting the throttle (the throttle is disabled by default due to EU legislation). By pressing the plus ➕ and minus ➖ buttons on the LCD display, you can adjust the electric motor's assist level. The higher the value you select, the more the electric motor will assist you. At level 0, the electric motor is completely turned off, meaning the bike is powered solely by your leg power.

Your electric bicycle's motor is installed in the rear wheel hub. The motor is powered by the battery. The motor's power and thus the electric bicycle's acceleration are determined by the selected assist level and pedaling motion. If the throttle is engaged, it also affects the bike's speed and acceleration.

If local legislation permits, you can choose to use the electric bicycle fully electrically (throttle engaged) or have the motor engage only when pedaling (Pedelec).

Your First Ride

(Copied from the section "Safety and Legal Considerations for Cycling")

Be EXTREMELY CAREFUL when riding your electric bicycle for the first time, as it accelerates considerably faster than a traditional bicycle when electrically assisted. Take your electric bicycle to an open area before starting. Do not start pedaling too quickly, as you may be surprised by how quickly your bike accelerates with electric assistance. After a short while, you will surely learn to enjoy the power of the electric motor.

Pedal-Assist Mode

(English: pedal-assisted or pedelec (pedal electric cycle) mode)

Note: To use pedal-assist mode, the battery must be connected and turned to the "ON" position with the key.

In pedal-assist or pedelec mode, the electric motor engages when the rider starts pedaling and disengages when the rider stops pedaling. The motor engagement and disengagement may have a slight delay. The motor assists you as long as you remember to pedal. You don't need to pedal hard; light and continuous pedaling is enough to keep the electric motor running. The motor also disengages when you press the brake or reach the maximum speed set on the trip computer. In Finland and generally within the EU, the electric bicycle motor must disengage when the bike reaches a speed of 25 km/h.

Select the appropriate gear using the handlebar shifter according to the riding conditions. Optimizing gear usage allows you to pedal more easily, and the bike moves faster and more smoothly.

Throttle

When using the throttle, the amount of electric assistance depends on the throttle's position: the more you twist the throttle, the more the electric motor assists your progress. To slow down, you can release the throttle back to its starting position and, if necessary, apply the brake simultaneously.

You do not need to pedal for the electric bicycle to move when using the throttle. Pedaling simultaneously can save electric motor energy, thereby extending the bike's range.

Note: The throttle is disabled by default. In Finland and generally within the EU, an electric bicycle must not move solely by the throttle. If this feature is enabled, the bike is classified as a motorized bicycle and is subject to different rules and requirements.

To enable or disable the throttle, first turn off the power to the electric bicycle's display. Then, follow the four steps shown in Figure 12.

Figure 12 - Enabling and Disabling the Throttle

1. Twist the throttle to its maximum position and hold it there.

2. Press and hold either brake lever.

3. Turn on the display ?. Hold the brake and throttle for approximately 8 seconds.

4. Release the brake and throttle.

Charging the Battery

Your electric bicycle has a lithium-ion battery that requires a specially designed charger. Do not charge the battery with a charger not intended for this purpose. Using the wrong charger can lead to battery overheating, ignition, or even explosion. If your charger is lost or damaged, contact your ENGWE bike dealer to obtain a new charger.

Charge the battery only when the bike is not in use. Before charging, the battery lock must be turned to the "OFF" position with the key. The battery can be charged while installed in the bike frame or after removing it from the frame.

Do not place the battery or charger near flammable materials when charging the battery. Charging should not be performed near infants or small children. It is also advisable to remove valuable items from the vicinity when charging the battery.

The battery charging time depends on the battery's charge level. Fully charging a completely depleted battery takes about six hours. When the battery is fully charged, the charger's LED light turns from red to green. At this point, disconnect the charger from the outlet first, and then from the battery. Do not leave the charger connected to the battery for too long.

The charger and battery may get slightly warm during charging, which is normal.

Removing the Battery from the Frame

The battery is an important and expensive part of your electric bicycle. To prevent theft, it is designed to lock into the frame using a key. You can further protect against theft by removing the battery from the frame entirely when leaving the electric bicycle unattended. Sometimes, the battery must be removed from the frame for charging when there is no space for the entire bike at the charging location.

To remove the battery from the frame, first insert the key into the battery. Set the key to the middle position, press the key slightly deeper, and turn it counter-clockwise. The pin in the battery must retract fully inside the battery for the battery to be removed from the frame. Push the lever behind the saddle upwards and turn the saddle to a 90-degree angle so that the battery can be removed by pulling it up. Finally, pull the battery out of the frame.

When reinserting the battery, ensure the rail in the frame properly aligns with the battery's groove.

Note: The battery is quite heavy; be careful not to drop it.

Optimizing Range

To achieve the maximum possible range, pay attention to or be aware of the following:

• The battery should be fully charged before setting off.
• Difficult terrain and hilly areas consume more energy.
• Constant changes in speed consume more energy.
• Increasing the transported load consumes more energy.
• Proper tire pressure and keeping the electric bicycle clean and well-lubricated saves energy.
• Ensuring the wheels spin freely when brakes are not applied saves energy. Brakes should be checked and adjusted as needed at regular intervals.
• Pedaling saves battery energy and extends the electric bicycle's range.
• When the battery is turned to the "OFF" position, your electric bicycle functions as a normal bicycle. If you are going on a long trip, consider saving battery by turning it off on long flat or downhill sections.

Maintenance / Service

Generally, maintaining your electric bicycle requires similar steps to maintaining a regular bicycle. Keep your electric bicycle dry and clean, and its moving parts lubricated. Avoid leaving the bicycle in a visible location without supervision whenever possible. Brake functionality should be checked before each use.

It is good to consider the following points with your electric bicycle:

• Your bike is designed for normal road riding by one person. Extreme maneuvers, such as very rough off-road riding, jumping, or carrying excessive loads, can damage the electric bicycle and cause serious personal injury.
• Do not wash your bike with high water pressure (e.g., a pressure washer), as water may enter the electric motor, controller, or wire connections, causing short circuits or corrosion of electrical components.
• Avoid leaving your electric bicycle outdoors in rain or snow. After riding in rain or snow, bring your bike inside and dry it with a clean, dry towel.
• Do not lose the keys or the trip computer control buttons. If one key is lost, make a copy of the spare key immediately. If both keys are lost, it is impossible to remove the battery from the frame.

Battery and Charger Require Special Care

• Use only the charger supplied with the bike to charge the battery. Do not use replacement chargers. If your charger is lost or damaged, contact your ENGWE bike dealer to obtain a new charger.
• Do not attempt to open or repair the battery or charger.
• Do not place the battery near open flames or corrosive substances. Do not immerse it in water or other liquids.
• Avoid exposing the battery to high temperatures, such as direct sunlight, for extended periods.
• Do not short-circuit the battery terminals.
• Over time, with frequent use, your bike's battery capacity will decrease. If you notice that the battery no longer holds a charge properly, even for short distances, contact your ENGWE bike dealer to obtain a new battery.
• If the battery is not used for a long time, it should still be fully charged approximately every three months. Store the battery in a cool environment.
• Your electric bicycle's battery is designed to last a long time with intended use. We do not recommend using the battery with other devices. Improper use can damage the battery, shorten its lifespan, or even cause it to ignite or explode.

LCD Display Instructions

Model: YL81C

Figure 13 - ENGWE L20 Electric Bicycle LCD Display: YL81C

Display Technical Specifications

• Voltage: 36V / 48V
• Nominal Operating Current: 15 mA
• Maximum Operating Current: 30 mA
• Leakage Current (Off State): < 1 UA
• Operating Current (with throttle): 50 mA
• Operating Temperature: -20°C ... +60°C
• Storage Temperature: -30°C ... +70°C

Display Functions

The YL81C display offers several functions to enhance your riding experience, such as:

• Battery charge level indicator
• Electric motor assist power indicator
• Assist level indicator and adjustment
• Speed indicator (real-time, maximum, and average speed)
• Distance traveled indicator (trip and odometer)
• Walk assist control and indicator
• Headlight control and indicator
• Error code indicator
• Bluetooth connection indicator (status)
• Settings menu

Display Function Layout

Figure 14 - YL81C Display Function Layout

Buttons

The YL81C display is operated by three buttons, located on the top and bottom sides of the display: the power button ?, the plus button ➕, and the minus button ➖.

Turning Power On / Off

Press and hold the ? button for a moment to turn on the display and power the bike's controller. When the power is on, press and hold the ? button again for a moment to turn off your electric bicycle. When off, the display no longer uses the bike's battery, and its leakage current drops below 1 uA.

• The display will automatically turn off if the electric bicycle is not used for over 10 minutes.

Display Interface

When the display turns on, it shows the bike's real-time speed (km/h) and distance traveled (km) by default. Pressing the ➖ button allows you to switch between trip meter (km), odometer (ODO) (km), maximum speed (km/h), and average speed (km/h). The odometer resets when its reading exceeds 9999.9 km.

Walk Assist

By pressing and holding the ➖ button, you activate the walk assist, and your electric bicycle moves at a constant speed of 6 km/h. The display shows the letter "P" in the assist level indicator. Releasing the ➖ button will turn off the electric assistance.

Walk assist should only be used when walking the bike. Do not use the assist while riding.

Headlights On / Off

Press and hold the ➕ button to turn on the headlight and dim the display backlight. Press and hold the ➕ button again to turn off the headlight and brighten the display backlight.

Assist Level Selection

By pressing the ➕ or ➖ buttons, you can change the electric assist level and thus the motor's output power. The YL81C display allows setting the assist level from 0 to 5.

Battery Charge Level Indicator

The battery charge level indicator consists of five rectangles. All five rectangles are visible when the battery is fully charged. If the indicator's outlines flash, the battery voltage has dropped very low, and the battery needs to be charged immediately.

Figure 15 - Battery Charge Level Views

Battery full, 4 rectangles, 3 rectangles, 2 rectangles, 1 rectangle. Outlines flashing: Battery is nearly empty and needs immediate charging.

Error Code Indicator

If there is an operational error in your electric bicycle's controller, the display will show an error code related to that error. Error codes are listed in Appendix 2 at the end of this manual.

Figure 16 - Error Code Indicator

When you see an error code, start troubleshooting immediately. Otherwise, your electric bicycle will not function correctly.

General Settings

• Parameters can only be set when the bike is stationary.

Resetting the Trip Meter

To reset the trip meter, press and hold the ? and ➖ buttons for at least 2 seconds.

Restoring Default Settings

"dEF" refers to restoring default parameters. Selecting "dEF-Y" restores default parameters, and selecting "dEF-N" rejects the restoration of default parameters.

To restore default settings, press and hold the ? and ➕ buttons simultaneously for over two seconds to enter the default parameter restoration menu.

Press the ➕ or ➖ button to make your desired selection. If you choose Y, press and hold the ? button for over two seconds to restore the default settings. Once the restoration is complete, the display will return to the initial interface.

Speed Limit

Press and hold the ➕ and ➖ buttons for over two seconds to enter the settings menu. The menu has eight settings, P1-P8, where P3 refers to the speed limiter. By adjusting this parameter, you can set your electric bicycle's maximum speed between 10 km/h and 40 km/h.

Press the ➕ or ➖ button to navigate to setting P3. Press the ? button to adjust the maximum speed. Then, press the ➕ or ➖ button to select your desired maximum speed. Confirm the selection by pressing the ? button. Save your settings by pressing and holding the ? button for over two seconds.

Note: Before setting the maximum speed above 25 km/h, ensure it is permitted by the laws of the country or region where the bike will be used!

Figure 17 - Maximum Speed Setting

Unit System Selection

Press and hold the ➕ and ➖ buttons for over two seconds to enter the settings menu. The menu has eight settings, P1-P8, where P4 refers to the unit system selection.

Press the ➕ or ➖ button to navigate to setting P4. Press the ? button to adjust the selected unit system. Then, press the ➕ or ➖ button to select your desired system: km/h (SI system) or MPH (Imperial system). Confirm the selection by pressing the ? button. Save your settings by pressing and holding the ? button for over two seconds.

Figure 18 - Unit System Selection

Safety

These safety precautions are provided to help you protect yourself and others around you. Read them carefully to avoid unnecessary personal injury, equipment damage, or damage to other property or items.

Battery

WARNING

• Do not throw the battery into fire.
• Do not overheat the battery.
• Do not connect the battery to devices other than your charger.
• Use only the charger designed for charging the battery.
• Do not disassemble or modify the battery.
• Do not short-circuit the battery terminals with metal objects.

Disassembly prohibited. (These types of misuse can lead to electrolyte leakage, overheating, and/or explosions)

WARNING

Protect the battery from water. Battery immersion can lead to short circuits, overheating, or damage. Do not immerse the battery. Getting the battery wet can cause irreversible damage.

Charger

WARNING

• Do not disassemble or modify the charger.
• Do not expose the charger to impact, e.g., by dropping it.
• Do not get the charger wet.
• Avoid prolonged skin contact with the charger during charging. This can cause skin burns, as the charger's temperature can reach 40°C-60°C (104°F-140°F).

Can lead to overheating, fire, or electric shock.

• Do not cover the charger or place objects on it.
• Can lead to overheating, fire, or electric shock.
• Do not short-circuit the charger terminals with metal objects.
• Place the charger on a stable, dry surface.
• Using the charger upside down or stretching the cord tightly can lead to malfunction, fire, or electric shock.
• Can lead to overheating, fire, or electric shock.

• Do not apply pressure to the cord or plug.
• Placing the cord tightly between a wall and window frame or placing heavy objects on the cord can lead to electric shock or fire.
• Insert the plug into the outlet carefully.
• An improperly inserted plug may lead to overheating, which can cause a fire.
• Do not touch the plug with wet hands. May lead to electric shock.
• Keep out of reach of children and pets. May lead to electric shock or injury.
• Do not attempt to use a charger from another manufacturer to charge the battery. May lead to overheating, fire, or electric shock.
• Do not use the charging plug or power plug if it is dirty, wet, or dusty. Moisture absorbed by dust or dirt can reduce insulation, potentially leading to fire. Pull the plug out of the socket and clean the plug with a dry cloth.
• When unplugging from the socket, always pull by the plug, not the cable.
• Always handle the charging cable with care.
• Do not pedal the bike while the battery is charging inside the bike frame. The charging cable can get tangled around the pedals and be damaged, leading to electric shock or fire.
• Do not expose the charger to excessively high voltage. Do not use plugs, connectors, or other wiring with the charger that have an output voltage other than the charger's approved standard voltage (110-240 VAC). May lead to overheating, fire, or electric shock.
• Do not use damaged components, such as the charger, power cord, plug, etc. May lead to electric shock, short circuit, or fire.

Appendix 1 - Troubleshooting

In case of a malfunction, the cause may be one or more issues. To fix the problem, all root causes should be identified first. In case of uncertainty, contact a qualified professional.

Table 1 - Troubleshooting Assistance

Appendix 2 - Error Codes

Error Codes for YL-01 and YL-02 Protocols

Error Codes for YL-05, KDS, and YL-J Protocols

Contact Information

Distributor:

European Union:

Madatshop
49-17634263100
Driburger str 4 33647 Bielefeld, Germany

Reseller:

Finland:

indieBikes
www.indiebikes.fi
Email: bikes@indiel.fi
00710 Helsinki, Finland

Manufacturer:

Shenzhen Engwe Intelligent Technology Co., Ltd.
Address: Room 207, Jiangnan Building, Yongziang Rd, Bantian St, Longgang Dist, Shenzhen, Guangdong, China
Postal Code: 518129
Email: service@engwe-bikes.com

The manufacturer reserves the right to change product specifications without prior notice.