Scribd
Upload
72 views1 page

Range Calculation

The document discusses how to calculate the capacity of batteries by multiplying voltage and amp-hours, and how to determine the number of cells needed based on the desired capacity and configuration. It provides an example of calculating the number of Lifepo4 18650 cells needed for a 12.8V 99Ah battery with a 4S66P configuration.

Uploaded by

anandganes
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as TXT, PDF, TXT or read online on Scribd
72 views1 page

Range Calculation

The document discusses how to calculate the capacity of batteries by multiplying voltage and amp-hours, and how to determine the number of cells needed based on the desired capacity and configuration. It provides an example of calculating the number of Lifepo4 18650 cells needed for a 12.8V 99Ah battery with a 4S66P configuration.

Uploaded by

anandganes
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as TXT, PDF, TXT or read online on Scribd
You are on page 1/ 1

multiply the voltage (V) and the charging capacity (Ah) of the battery.

This gives
you the energetic capacity (Wh) of the battery.

V x Ah = Wh
e.g. : 36 volt x 10Ah = 360Wh = 0.36kWh

Battery Capacity Required (Wh) = Power Demand per distance traveled (Wh / mile or
km) x Typical Distance Traveled (miles or km)

Battery management system (BMS)

Many 18650 battery packs may consist of a combination of series(S) and parallel(P)
connections.

The calculate is still on�

What if we use Lifepo4 18650 cells(which are rated 3.2V 1.5Ah)? we would need 264
cells in total with 4S66P configuration to get the same total capacity of 11.1V
100Ah(actual capacity is 12.8V 99Ah).

PS: 11.1V/3.2V=3.5 people normally use 4S to boost voltage,

100Ah/1.5Ah=66.6

If you have, for example, 2Ah lithium ion 18650 battery cell then each of those
stores 7.4Wh (3.7V*2Ah=7.4Wh) of energy and you need 136 of them (1000/7.4 ~ 136)
for a 1kWh battery. 136 in parallel will give you a 1kWh battery with a nominal
voltage of 3.7V.

If you want higher voltage, and you probably will, you have to put them in series
as well. 7s is a typical minimum for a Home UPS battery. 136 cells can�t be evenly
distributed over 7 packs in series, you then need 140 cells for a 7s20p setup.

https://omobikes.com/blogs/news/complete-guide-how-to-calculate-range-of-your-
ebike-and-buy-best-e-bike-for-you-in-india-electric-mtb-hybrid-cycle

You might also like