ELECTRIC VERSUS GASOLINE
1 hp = 746 watts.
ZEV5700 = 5700/746 = 7.6 hp.
ZEV7000 = 7000/746 = 9.38 hp
Chinese 300 cc(really 275 cc) water cooled has 13 hp.= .043 hp/cc
Chinese 50 cc air cooled has 2.2-2.4 hp = 1641 watts. Way under smallest ZEV.
Chinese 125 about 5.375 hp = 4000 watts. Same as ZEV4100
Chinese 175 cc about 7.5 hp =5600 watts A little less than ZEV5700
Chinese 200 cc about 8.6 hp = 6415 watts. Less than ZEV7000
ZEV ELECTRIC VERSUS OTHER ELECTRIC BIKES
HOW TO TELL IF IT IS CHEAP LEAD OR LITHIUM
How many battery in the system?
If 4, 5, 6 battery then this is a lead battery system. Lead battery are 12 V. So 4 battery is 48 V, etc.
Lithium battery systems will be 16 battery (48 v), 20 battery (60 v), 24 battery (72 v), 28 battery (84 v)
By the amp hour (Ah) of the battery. Lead will be 28, 6, 38, or 46, 48 Ah. Lithium will be 40, 60 Ah
HOW TO FIGURE THE POWER OF THE BIKE
Most web sellers and Chinese companies lie about the power. As an example, they quote a
5000 watt motor in the specifications. But the question is does the system give the motor 5000
watts. Look at the battery system. Number of battery tells you the voltage. See above. You
have to look for the amps of the system. If the advertisement says 60 amps and the volts is 60,
then this is a 3600 watt input to the controller and the motor. But motors are not 100% efficient.
They are only 83 to 85% efficient. So 3600 X .85 = 2880 motor actual output maximum. It does
not matter that the motor is a 5000 watt motor if it is only getting 2880 watts.
If the advertisement does not tell you the volts but says that the bike has 20 battery or 5 battery,
then you know it is a 60 volt system.
Most motors are at best 83% efficient. ZEV are 85% efficient even when they are hot.
Most Chinese bikes are 55 or 60 amps to make the range further. Some few bikes run 80
amps. This would be 60 V X 80 amps X .85 = 4080 watts. Like our 4100. We run 100 amps in
the 5700 watt and above bikes using the power boost controller.
If a customer wants more range but wants to keep the speed higher and give up power and
acceleration, the we can lower the amps.
A 60 volt bike with 80 amps will be 33% better on acceleration and hill climbing. 80/60 = 1.33.
HOW TO COMPARE MOTORS
The torque of the motor is first determined by the diameter of the motor. The larger the motor
diameter, the more torque. A 10.66 inch ZEV motor will have 33% more torque than an 8 inch
diameter motor AT THE SAME AMPS AND VOLTS.
The smaller the diameter of the motor, the faster it will run on the same volts. An 8 inch motor
will run 33% more rpm than a 10.66 inch ZEV motor on the same amps and volts. But it will
also take 33% more amps to have the same torque or hill climbing ability.
The smaller the diameter of a motor the more it overheats. It has less mass to absorb the heat
and less surface area to get rid of the heat.
PEAK VOLTAGE VERSUS NOMINAL
All battery system have more voltage when coming off charge then the system is rated for
A 60 volt rated bike system really has 72 volts peak.
72 v 84 v
84 v 96
Battery capacity is in Ah.
The battery are rated in Ah also.
The voltage used for the calculation is the peak volts available
5 lead battery with 46 Ah at 60 volts (72 volts peak) is a 72X46 = 3.312 Kwh system
24 lithium battery with 40 Ah each battery at 84 volts peak (72 volt nominal) = 84 X 40
Ah = 3.360 Kwh (ZEV5700)
24 lithium battery with 60 Ah each battery at 84 volts peak (72 nominal) = 84 X 60 Ah =
5.040 Kwh (ZEV5100 long range