1. What is an electric bicycle?
It is an environment-friendly means of transportation with batteries as its power source, and quality and a quiet DC electric motor as the driving mechanism. As an embodiment of new and high technology, electric bicycles can be pedaled, power-driven or pedaled with the help of power.
2. What types of electric bicycles are there?
Electric bicycles can be classified into different types with wheels diameters that range from of 16 to 26 inches, etc. They can also be grouped into chain transmission, frictional transmission, camshaft transmission, and CVT (continuously variable) according to their transmission modes, or into general electric type, and mixed mode type according to their driving power. In addition, on the basis of the electric motor modes, such bicycles can also be categorized as brushless DC motor, brush-and-tooth motor and toothless brush-type motor. Veloteq electric bicycles employ only brushless DC motors which do not require the maintenance of brushed DC motors.
3. What are pedal-assist electric bicycles?
Pedal-assist electric bicycles are lightweight vehicles that require the use of both manual pedaling and electric motor power in order to achieve reasonable distance of travel. The majority these employ 150W motors and may use NiMH, Lithium Ion, or sealed lead acid batteries. They do not have the load capacity of large frame ebikes.
4. What are power-on-demand electric bicycles?
Power-on-demand electric bicycles furnish high power output using large electric motors and large power supplies. Veloteq large frame electric bicycles are all power-on-demand ebikes and use special, high power controllers, coupled with large power storage capacity to enable long distance travel without manual pedaling. Manual pedaling is used primarily for cresting hills, where electric power is not sufficient to surmount them. Veloteq is now introducing models which employ CVT transmission driven motors which enable the cresting of steel hills and long grades. All Veloteq large frame ebikes will use this type of motor in 2008.
5. Are ebikes with larger diameter wheels faster?
Of course not. As a matter of fact, the maximum speed of the bicycles with wheels of various diameters of 16 inches, 18 inches, 20 inches, 22 inches, 24 inches 26 inches and even 28 inches is the same, that is, 20km per hour which is the maximum allowed by US and Canadian regulations for the sake of both safety and speed.
6. Pedal power or electric power, which is best?
It depends on circumstances. Use pedal assistance when surmounting inclines or riding against strong wind. Pedaling can effectively help to avoid the overworking of the electric motor and minimize the damage to such precision parts as the motor, controller, and battery under those conditions to prolong the service life of those components. Pedaling is almost always required when riding pedal-assist ebikes because of their limited range using electric power alone.
7. Which type of electric motor is better? Brushed or brushless type?
In the case of the brushed electric motor, the motor functions with the direct contact of the brush and commutator. Such motors offer high power and low cost, but the brushes need replacement once each year or two to maintain efficiency. Brushless electric motors avoid this disadvantage and are quieter, have a longer service life and consume less power, but the cost for controllers is higher.
8. What is the maximum driving distance of a newly-charged electric bicycle?
The maximum driving distance of a newly-charged electric vehicle is called “single charge driving distance”. The single charge driving distance of a of a Veloteq large frame power-on-demand ebike 30-50 miles (50-80 kms) depending on the model, terrain in which it is ridden, wind conditions, and the load, including the rider and any cargo. Pedal-assist ebikes generally have a range of >20 miles using motor power alone.
9. What is the service life of the battery?
Veloteq uses VRSL (Voltage Regulated Sealed Lead Acid) colloid batteries. An special agent added to the electrolyte forms it into a gel-like material that also reduces sulphication of the electric plates in the battery. They are rated for 300 cycles if discharged continually to less than 75% of capacity, but can be recharged over 400 times if the capacity is not allowed to go below 80%. They are UL Listed. In extend the service life of battery, we advise owners to maintain and charge the battery regularly and promptly after each use and use pedal assistance when surmounting steep inclines. When the ebike is stored for prolonged periods, both the batteries and charger should be stored at temperatures above freezing and recharged monthly. We recommend that the power supply unit be removed from the ebike while it is in storage.
10. Are there new emerging technologies which will improve the performance of power supplies?
Definitely yes. Veloteq and PowerGenix Corporation of California are engaged in the development of a revolutionary new type of power supply that will offer the advantages of technologies such as NiMH and Lithium Ion, without the high cost and much publicized dangers of lithium. The power supply weight will be reduced by over 50%, recharge time will decrease to 80% of power capacity in one hour, size will be reduced, and the travel range will be increased. In addition, they will contain no toxic or polluting materials. This project is on track and scheduled for release in early 2008.
11. Is recharging convenient? What cautions should the user take when charging?
The power supply may be recharged while installed on the ebike or while removed for indoor storage.
• Be certain to plug the charger into the power supply input socket BEFORE attaching to the AC source. Connection to the AC source prior to connection to the power supply can cause a spark which, in the event that the batteries have been damaged, may cause any leaked gases to ignite, causing an explosion.
· Under no circumstances should the power supply be recharged after storage at sub-freezing temperatures while installed on the ebike. If either the power supply or the charger has been stored in sub-freezing temperatures, move them to a warm area and allow them to adjust to the ambient temperature. Remove the top lid of the power supply to vent any hydrogen gas that may build up if the batteries were damaged. Also, carefully monitor the recharge time in case the charger has been damaged. Carefully inspect the batteries to detect any sign of swelling of the battery walls. If the batteries are swollen, do not attempt to use them or continue recharging. This may cause an explosion. If the batteries are able to sustain a charge properly, carefully observe the condition of the charger to insure that the status light indicates successful charge. It they status light does not change to green, this is an indication that the charger has been damaged. It should be immediately replaced.
· Under no circumstances, should the battery be laid up-side down or the service life and the charging effect would be adversely affected.
• When removing the battery from the ebike, do not touch the second electrode nipple under the battery case with bare hands or other conductive materials, otherwise, a short circuit may occur resulting in personal injury.
• The user should place the battery that is being externally charged in a dry and well-ventilated place. Do not place any cover on the battery being charged or the battery may be damaged for due to overheating.
• Do not permit any liquids to enter the battery recharger that is either in function or in care so as to avoid short circuit; do not use in the rain. Do not overturn or drop the charger.
• Use only chargers supplied by Veloteq. These have been tested specifically to meet the amperage and voltage requirements of Veloteq ebikes.
• During the charging process, if an abnormal smell is detected or the charger unit becomes unusually hot, these are indications of faulty operation. The charger must be replaced at once before re-attempting to charge the power supply.
· 12. How long will it take to charge the power supply?
A new battery should be charged for 7-8 hours and flow charged for 1-2 hours before its first service. For routine charging, over-charge or over-discharge must be avoided. The power supply should be recharged promptly after each use, which will greatly increase the life span of the unit. In case of shorter riding distances, 2-3 hour recharge should be sufficient. The Veloteq/PowerGenix power supply which will be introduced early in 2008 will permit the reduction of the recharge time to one hour for 80% of capacity and full charge in under two hours.
13. Is it safe to ride an electric bicycle? Will the rider exposed to a risk of shock?
Veloteq ebikes operate on a voltage of only 48V. You can be shocked by mishandling, however, not enough to constitute a serious safety threat. In addition, intelligent functions are incorporated in Veloteq ebikes which include automatic power cut-off upon braking and numerous electrical devices such as circuit breakers which will cut off the power to protect the motor and controller.
14. Can I ride an electric bicycle in the rain?
Veloteq ebikes perform very well in rain, however, under no circumstances should be ebike or power supply be subjected to immersion in standing water. This may subject the controller, motor, and other electrical parts to severe damage. If the ebike has been exposed to flooded conditions, the power supply must be removed and the ebike taken to a service location for inspection and restoration to working order. DO NOT SWITCH ON AN EBIKE THAT HAS BEEN EXPOSED TO THE ABOVE CONDITIONS!
15. Can Veloteq ebikes be used in winter and summer?
Yes. They are rated for use in temperatures ranging from -15C to 50C . They perform well in summer and in winter. The power supply will be less efficient in winter than in summer, which will reduce the riding distance and require more frequent recharging. Ebikes and particularly, chargers, should not be subjected to protracted exposure to sub-freezing temperatures!
16. Are Veloteq ebikes economical to ride?
Electric bicycles have proven to be very economical means of transportation in comparison with other transportation means of local transportation for commuting and leisure. The cost of recharging the power supply is less than 10 cents for up to 50 miles (80 kms) of riding. If properly maintained by the user, the cost of maintenance is extremely low.