Estimation of the autonomy of your electric bicycle kit

Autonomy depends on several factors:

The effort provided by the pilot :

Tire type and inflation pressure :

Engine efficiency :

The acceleration curve :

This is about how you turn the handèle accelerator. As with the accelerator of your car, you should not accelerate in a binary way (all or nothing). Accelerate gradually and support your engine when starting up by pedaling. To accelerate, gradually turn the handle to avoid peaks in intensity that will decrease your range.

The actual battery capacity :

 

Indeed, entry-level cells will provide 10Ah under a discharge current of 5A, then will only provide 8.5Ah under 10A and 7.5Ah under 15A. A current of 15A is generally their limit. Cells of average quality will be able to accept currents of 20A to 25A but they will provide the 10Ah in general under a discharge current of 15A and their performance will decrease to reach about 8Ah under 25A. The high-performance cells can take up to 50A of discharge current and deliver the 10Ah of capacity under currents of 35A with no problem.   For example, the Samsung cells that we use in our packs deliver 9.5Ah under 45A of continuous discharge current.

The outside temperature :

As a general rule, traction batteries, all technologies combined, retain their performance for temperatures between 10°C and 35°C.

At around 0 ° C or below, there is a loss of autonomy of 20% to 30% depending on the batteries.

This loss of autonomy in low temperatures is valid for charging and discharging, which is why we recommend that you charge your battery indoors between 10 ° C and 25 ° C.

The age of your battery :

The older the battery, the poorer its performance. Here too the quality of the cells is involved. Indeed, some entry-level lithium batteries will lose 50% of autonomy after 12 months and 70% after 18 months. In general, the loss of autonomy on a Lithium-Ion battery is 20% after 300 cycles (1 year) and 30% after 700 cycles (2 years). The cells we use in our OZO 48V 10Ah compact batteries lose 20% capacity after 1000 cycles (3 years) and 40% after 1500 cycles (4.5 years). However, the loss of capacity on your battery may not be due only to natural cell wear. Indeed, if your BMS is not of good quality, it can create an imbalance of performance of the cells constituting your pack. If your battery is no longer under warranty and is less than two years old, we can work on it in the workshop to "boost" the faulty elements and allow you to regain a few additional Ah.

How you use your battery: (charging, discharging, storing, etc.)

Methods for estimating the autonomy of your electric bicycle kit :