Flexible setup configurations, wide feature range, power range and affordable price have led the this product to widespread appeal in a range of EV applications. From the dashboards of MIT's solar car, to record breaking electric motorbikes, to small trains, powered wheelchairs, and even sailboats and airplanes, the Cycle Analyst has become the e-meter of choice for keeping track of a vehicle's battery usage and performance characteristics.
Since May 2011, we have offered the latest "large screen" model. With 3 times the area, its backlit character display is easier to read than ever. The operating voltage range has also been expanded to function between 10V and 150V, allowing compatibility with 12V systems and those pushing higher voltages.
For anything else, such as units operating up to 350 Volts, OEM boards, volume orders, or other custom requests, please contact us directly.
What it does
Once connected to the vehicle's power bus, the Cycle Analyst calculates and shows the following information:
- Volts, Watts, Amps: The instantaneous electric power being drawn from the battery.
- Amp-Hours, Watt Hours: The net energy that has been pulled from the pack since the meter was reset. The accumulated amp-hours let you know the remaining energy in the battery pack with far greater accuracy than a voltage or LED indicator.
- Speed, Distance, Time: All of the basic features of a bicycle computer, including the average and maximum trip speeds, plus a total distance odometer.
- Regen, Wh/km: There are several quantities this meter will calculate that you don't get with other instrumentation, such as the percentage of extra range that was gained from regenerative braking, as well as the vehicle's average energy use in Watt-hours per kilometer or mile.
- Peak Currents and Voltage Sag: Records the maximum forwards and regenerative currents as well as the minimum voltage on the battery pack.
- Total Battery Cycles and Amp-Hours: Retains life cycle information on the vehicle's battery pack, such as how many charge and discharge cycles the pack has experienced and the total amp-hours that were delivered over its entire life.
Furthermore, the Cycle Analyst has the ability to over-ride the user's throttle and regulate the power delivered to the motor, turning an otherwise dumb EV into an intelligent device with a user programmable speed limit, current limit, and low voltage cutout.
- Speed Limit: This has the utility of providing legal compliance to the speed cap imposed on ebikes in most jurisdictions. When used with a full throttle, it serves as a cruise control on the electric bicycle. It can also be beneficial to riders who want to increase their torque and power by using a higher voltage battery, without simultaneously increasing their top-end speed.
- Current Limit: An adjustable amps limit is useful to prevent damage to the batteries from excessive current draw, to increase the range that you'll get on a charge, and to protect the motor controller and motor in setups that draws too many amps.
- Voltage Cutout: A low voltage cutout is used to protect a battery pack from being discharged too deeply, which can cause cell reversals in NiMH/NiCad packs, permanent cell damage in Lithium packs, and sulfation in Lead Acid batteries. The programmable low voltage rollback allows you to set an appropriate low voltage point tailored to your pack.
Additional Features
- Remote Shunt: Unlike the watt-meters and amp-hour meters designed for RC hobbyists, the Cycle Analyst uses a remote shunt for sensing current rather than running wire through the meter, so you do not need to route heavy gauge battery cables up to the handlebar and back.
- Backlit LCD: The display readout is well illuminated for night riding.
- Water Resistant: The circuitry is fully enclosed in a sealed box enabling it to withstand exposure to wet and rainy conditions.
- Handlebar Mounting: Easily attaches to handlebar tubes from 7/8" to 1 ¼" diameter with included hardware.
- Save on Power Down: Trip data such as amp-hours and distance are saved when the meter is shut off, and are restored when power is re-applied.
- Fwd and Negative Amps: Both positive and negative amp-hours are displayed separately, so you can calculate accurate regenerative braking statistics or use it to monitor charging currents as well.
- Wide Voltage Range: Operates from 10V to 150V, accommodating the vast majority of all small electric vehicles. A high voltage option for use up to 350V is available on special request.
- Flexible Speed Input: Detects vehicle speed either with a magnet and sensor cable or through the hall effect signal on brushless motor controllers.
- Data Logging: Devices have a serial output stream that can be used for real-time recording the vehicle statistics to a computer or laptop.
Specifications
| Voltage: |
10-150V standard for Rev11 PCB (15V - 100V for Rev10 and earlier). Modification for use up to 350V is also possible. |
| Quiescent Current: |
7mA |
| Current Range: |
+ - 200 mV/Rshunt. So for instance, with a 2mOhm sense resistor, the maximum current is 100 amps. With a 0.5 mOhm sense resistor, up to 400 amps, and so forth |
| Current Resolution: |
0.01 A in low range mode, 0.1A in high range mode |
| Current Accuracy: |
Temperature coefficient and accuracy depend on the shunt and calibration. With the pre-calibrated Stand-Alone model, it is within 2% +- 0.04A. |
| Speed Range: |
Up to 600 kph or mph. There is an upper limit of about 600Hz for the speed sensor input, which correlates to a very fast moving vehicle indeed. This can be increased to over 3 kHz by removing capacitor C6 on the circuit board |
| Wheel Size: |
There are no restrictions on the allowable wheel circumference within the range of 0 to 9999 mm. |
| Distance: |
Trip distance is capped at 1999 km or miles. Odometer distance rolls over after 99,999 km or mi. |
| Amp-Hours and Watt Hours: |
Both forwards and negative amp-hours are limited to 1999 Ah per trip in low range mode, or 19999 Ah in high range mode. The trip watt-hours can go up to 19999 Wh in low range mode, and 199999 Wh in high range. |
User Manual
 Large Screen V2.23 User's Guide for Rev11 PCB layout(April 2011)
Manuel Utilisateur, version 2.23, en Français (French version)
* Set-up Tip: The Cycle Analyst may be programmed for use with various shunt resistors. The manual above describes how to do this in the Advanced Setup Menu. It assumes you know the resistance (mOhm value) of your shunt. You can determine this value with reasonable accuracy by using the formula R=V/I. For example, if using a 50mV 200Amp shunt resistor (also written as 0.050V 200Amp) the formula looks like this:
R = 0.050V / 200Amp
Do the math and we find that R=0.00025 Ohm. Since the Cycle Analyst is expecting a mOhm value (not Ohm), multiply by 1000 and we get 0.25mOhm.
IMPORTANT:
- Shunts and other "accessories" are sold separately.
- For Electrathon type competition vehicles, we suggest this shunt.
- You can also View all shunts if you wish to select one for your unique needs.
- Adding this item to your cart with no comments, will default to
the HC or "High Current" version. If you want a non-HC version, be
sure to clearly state which version you are ordering in the check-out
comments.
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Cycle Analyst - Energy/Power Monitor
