Language: 
To browser these website, it's necessary to store cookies on your computer.
The cookies contain no personal information, they are required for program control.
  the storage of cookies while browsing this website, on Login and Register.

GDPR and DSGVO law

Storing Cookies (See : http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm ) help us to bring you our services at overunity.com . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
https://overunity.com/5553/privacy-policy/
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding

User Menu

Google Search

Custom Search

Author Topic: NEED BATTERY ADVICE  (Read 2458 times)

Offline magnetman12003

  • Hero Member
  • *****
  • Posts: 854
NEED BATTERY ADVICE
« on: August 18, 2016, 03:01:52 AM »
I have a small 12 volt fan rated at .30 amps.

If I used a fully charged 12 volt 12 amp hour battery how long will I be able to run the fan?
Same question for a 7 amp hour battery and a 1.2 amp hour battery.
Is there some sort of formula for figuring this out?

Offline Magluvin

  • Hero Member
  • *****
  • Posts: 5886
Re: NEED BATTERY ADVICE
« Reply #1 on: August 18, 2016, 05:12:13 AM »
I have a small 12 volt fan rated at .30 amps.

If I used a fully charged 12 volt 12 amp hour battery how long will I be able to run the fan?
Same question for a 7 amp hour battery and a 1.2 amp hour battery.
Is there some sort of formula for figuring this out?

Basically it works like this...

12ah will cover either 12 amps for 1 hour or 1 amp for 12 hours.  So 1ah can run .3 amps for just about 3.3 hours. And 12ah can run .3amps for nearly 39.6 hours hours.   

12ah - 12amps for  1 hour
12ah - 1amp     for 12 hours
12ah - .3amps  for 39.6 hours

7ah - .3amps    for 23.1 hours

1.2ah - .3amps  for 3.96 hours

Over the range of hours the voltage will decline from full charge down to the final count down. So say the battery is 13.2v to start(new battery settled resting voltage after full charge) and can be down to around 12v to 12.3v at the finish line, depending on the battery quality and or condition.

Mags