What do I do if I want a 1kWh battery?

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Jan 7, 2017
What do I do if I want a 1kWh battery?

This is just a matter of simple math.

A 1kWh battery can have all kind of different physical sizes/shapes and electrical configurations, there is no standard or THE single solution for this.

If you have, for example, 2000mAh 18650s, then each of those stores 7.4Wh of energy, then 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 LiIon battery. 136 cells can't be evenly distributed over 7 packs in series, you then need 140 cells for a 7s20p setup. That will give you a battery with a nominal voltage of 25.9V (7 * 3.7V) and a capacity of 40Ah (20 * 2000mAh) which results in 1036Wh (25.9V * 40Ah).

And this is just one example, there are plenty of other possibilities. For example you then have to figure out what your load is going to be and if 20p is enough to handle the current and if the run-time is what you want.

DISCLAIMER: I am by no means an expert on any one or all of these fields/questions/topics. The results of this FAQ is a collaboration of multiple different members to come up with a common list of questions that would be asked and we have tried to answer. I was the member who was chosen to post the FAQ. If you have question that goes beyond the FAQ, please post your questions in the relevant section pertaining to your inquiry. Thank you and have a nice day