Too few amps for my fan

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1

Hello, and thanks for looking at this,

would anyone care to teach me a basic DC lesson,

I have myself a 12v 1600maH battery pack which I put to a 12v 2700maH fan. The fan starts up without hickups. But I was wondering how it is that the battery pack could run something which requires a highter amps rating.

A fully loaded 1600maH battery will run a 1600maH device for an hour. Will it also run a 3200maH device for half an hour? And a 6400maH device for a quarter of an hour?

Thanks a lot in advance,

Morten

2

Your battery can provide 1600ma for one hour. This is not the maximum amperage of your battery, which is usually very high depending on the battery.

3

1600maH is not the only parameter, for example if your device can work on a voltage range from 11.8V to 12V and consume 1600mA. Saying that your device will work properly for an hour is a wrong assumption. Indeed the voltage will fall down and probably that few minutes after starting your device wil stop. (For a Fan, this is not very important, the consumption is high while starting and the fan components are not voltage sensitve).

4

The battery is this: Lynxmotion - 12.0 Volt Ni-MH 1600mAh Battery Pack

So it’s like this? (picture)

5

@ harleydk - That battery can discharge at 16A

ps - no mail yet…

6

Have a look at here http://easycalculation.com/physics/classical-physics/battery-life.php

7

Thank a lot, guys. Tried to mark more than one answer, didn’t happen.

Justin, it’s ón it’s way :slight_smile:

8

@ harleydk - Super.

I have just received a Spider for a project so will be able to compare apples with apples :slight_smile:

9

@ Justin - Usefull site there, cheers