# Efficiency of charging

**URL:** <https://community.electricforum.com/t/efficiency-of-charging/1400>\
**Category:** EV Small Talk\
**Created:** [April 19, 2010, 9:15am UTC](https://community.electricforum.com/t/efficiency-of-charging/1400 "2010-04-19T09:15:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wsbca](https://avatars.discourse-cdn.com/v4/letter/w/a8b319/32.png) [@wsbca](https://community.electricforum.com/u/wsbca)\
**Post date:** [April 19, 2010, 9:15am UTC](https://community.electricforum.com/t/efficiency-of-charging/1400/1 "2010-04-19T09:15:34Z")

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Hi - I tried this in the charger topic but it appears those parts of the forum don’t get much use:

In general, how efficient is the act of charging a battery? For example, the battery for the Leaf is supposed to hold ~23kW-h. How much, in kW-h going through your electric meter is it likely to take to get a kW-h into the battery? Put another way, if I want to zero out usage for an electric car using solar panels, will an AC kW-h coming from the panels (or the grid) be nominally equivalent to a usable kW-h in the car, or will I have to generate a lot more than the car will “use”?

Thanks for any feedback

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**Author:** ![Jiessie\_Huang](https://avatars.discourse-cdn.com/v4/letter/j/85f322/32.png) [@Jiessie\_Huang](https://community.electricforum.com/u/Jiessie_Huang)\
**Post date:** [April 20, 2010, 8:14pm UTC](https://community.electricforum.com/t/efficiency-of-charging/1400/2 "2010-04-20T20:14:47Z")

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Hi guys,  
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