Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[e-cite]

So I am new to the eMC movement as I just purchased my first emotorcycle. I have a 2013 Brammo which has a 10kwh battery. I have a plan to double that capacity but am having problems with calculations. Can anyone enlighten me as to the normal operating wattage draw one may expect on the motor? Once complete I should have 20 kwh battery and just want to estimate average run time.

[Curt]

In the case of my small Zero FX, the motor has 20 kW max power and battery 6500 Wh. We don't get the max power though. It's best to measure power in Wh/mi, as displayed on the dashboard.

The FX averages anywhere from 80 Wh/mi for 40 MPH on the flats to 220 Wh/mi going up a steep hill or on a freeway. My typical ride with some hills or freeway averages 105 Wh/mi. Dividing (6500 Wh) / (105 Wh/mi) = 60 miles average range. Similarly I have a minimum range of 30 miles and maximum of 80 miles.

The Zero SR has a 50 kW motor, and the SR/F has an 80 kW motor. They'll have correspondingly larger Wh/mi averages. You may be able to scale these numbers taking into account your battery kWh and motor kW to make some estimates.

Can your bike display consumption in Wh/mi? Then you can estimate your range in any particular riding style by dividing 20000 Wh by the consumption when riding in that style.

[TheRan]

The power of the motor doesn't actually matter unless you're accelerating at a rate faster than you would on the lower power motor. If you ride at the same rate then power consumption will be essentially the same. The SR/F may end up consuming a little more energy as it's heavier, or it could be less if it's more aerodynamic (or they could even out). Tyres will also have an effect (and inflation pressure), an FXS would go slightly further than your FX and I'd go further on an S than my DS. Aero is probably one of the largest variable when it comes to range (other than speed of course).