Electric Bike Wh
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"Watt's Up" RC Watt Meter & Power Analyzer WU100 Version 2 --- SALE!
Sale Price: $54.00  |
Description# Specifications: |
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Battery Tender Waterproof Jr. Motorcycle Battery Charger
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Description12V-800mA charger is 100% waterproof, lightweight and compactThree-step constant current charge program with SuperSmart technologySpark-proofShort circuit and reverse polarity protectedWeighs just 1 lb. |
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Battery Tender 4-Bank Battery Tender Charging Station
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DescriptionBattery Tender 4-Bank Battery Tender Charging Station The 4 Bank Battery Tender Charging Station is four encased 1.25 amp battery chargers designed to fully charge a battery and maintain it at proper storage voltage without the damaging effects caused by trickle chargers 4 independent charging stations12 volts 1... |
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Currie 1000 Watt Motor - Direct Drive - 12" Complete Rear Wheel Assembly w/ Gear Box & Disc Brake for Ezip E1000 & Schwinn S1000 Electric Scooter
Sale Price: $219.58 |
DescriptionCurrie 1000 Watt Motor & Direct Drive -Complete 12"x 3.0" Wheel, OEM Replacement Rear Wheel Assembly by Currie Tech. Includes 1000 Watt Motor, Direct Drive Motor/Gear Box, Tire/Tube, Disc brake, Axle, & end caps for mounting... |
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Currie Technologies eZip Skyline Women's Low Step-thru Electric Bicycle
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DescriptionWomen's Ezip Skyline Electric Bicycle uses electric and pedal power for one sweet ride! Delivers fun and comfort on every ride... great for city living! Currie Electro-Drive PAS / TAG system allows you to choose throttle only or pedal assist modes of electric power... |
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IZIP Ultra Electric Bike - 2011 Model
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DescriptionMOTOR : Exclusive Alloy Shell 500W DC Brushless Geared Hub Motor BATTERY : EV Rated Li-ion Type, Down Tube Mounted, 36V / 10Ah Pack, Rechargeable Cells, Advanced BMS CHARGE SYSTEM : UL Listed Currie Smart Charger with LED Status Display CONTROLLER : Exclusive Currie Electro-Drive, 36 Volt Fully Potted with Power Gauge Function TOP SPEED : Up to 20 mph/ 32 km/h (Rider Weight, Rider Input and Terrain Contingent) RANGE : Up to 25 -35 Miles / 40 - 56 km with Normal Pedaling (Rider Weight, Rider Input and Terrain Contingent) DRIVE : Exclusive Currie Electro-Drive Geared Hub Motor, SRAM Via Front and Rear Derailleurs and Shifters, 24-Speed Drivetrain BRAKES : Avid BB5 Disc with Alloy Motor Inhibit Levers WHEELS : Alex 700c Double Wall Alloy Rims with Stainless Steel Spokes, QR Front TIRES : Vittoria Randonneur 700 x 35c, with double shielding puncture protection... |
Electric Bike Batteries - What Is a Watt Hour and Why Do I Need to Know?
If you are considering purchasing or building your own electric bike then you need to educate yourself a bit on different technical terms so you can make an informed decision when purchasing batteries for your bike.
One term that may come up is watt hours or Wh for short. A Watt Hours is an important measurement when determining how much battery capacity you require to travel a specified distance. It represents the total energy available in a given battery pack. It is calculated by multiplying the amp hour or Ah of a battery pack by the total voltage of the pack. A 36-volt 20Ah pack and a 72-volt 10Ah pack both contain 720 watt-hrs; therefore they should both be able to get you the same distance provided you ride at the same speed. With the 72v pack you can accelerate faster and have a much higher top speed than the 36v pack. If you take advantage of this (it's really hard not to use all that extra power) and ride at a higher speed you will encounter more wind resistance using up more power. This will result in your distance traveled prior to the batteries running out being less than that of the 36v pack traveling at a lower speed but you will reach your destination faster. With a Crystalyte 5304 hub motor in a 24-inch rim and a motor controller set to 90 amps you will average around 35 to 45 watt-hrs per km (58-75 watt-hrs per mile). This is at a cruising speed of around 65KPH (40MPH) and no pedaling. How fast you accelerate and your top speed will influence your power consumption. It will also vary depending on how flat or hilly the terrain is and how much weight you are carrying. You can use less than 25 watt-hrs per KM if you ride really slowly (using the same setup mentioned above) on flat terrain or use over 65 watt-hrs per KM riding full throttle up hills.
I hope this gives you some useful information on what a watt hour is and why you need to know. It makes it much easier to determine what size of battery pack you need to travel a specified distance.
About the Author
Electric Bike - Learn how to build your own fast electric bike and leave your car at home. My name is Greg Davey and I have been commuting to work for the past two years on an electric bike I build that has a top speed of 50MPH. Click Electric Bike to learn how to build your own.
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