Question about run time
Register

Welcome to the Prepper Forum / Survivalist Forum.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

Question about run time

This is a discussion on Question about run time within the Alternative Energy (Wind, Solar, Hydro etc) forums, part of the Off-Grid Lifestyle category; Without getting to technical If I'm using a standard deep cycle battery like what Walmart sells. How long would it take for 8watt bulb to ...

Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 26
Like Tree11Likes

Thread: Question about run time

  1. #1
    Senior Member


    Join Date
    Apr 2013
    Posts
    2,464

    Question about run time

    Without getting to technical If I'm using a standard deep cycle battery like what Walmart sells. How long
    would it take for 8watt bulb to wear the battery down to the point of needing to shut it off before it is damaged?

    working on building security light that would on solar
    Taking your guns is like eating a whale,,,,,,One bite at a time

  2. #2
    Senior Member


    Join Date
    Jul 2017
    Posts
    506
    Would think that might depend on the amp hours of the battery....would vary some one type to another ..

    Sent from my SM-G892A using Tapatalk
    Kauboy likes this.

  3. #3
    Senior Member


    Join Date
    May 2014
    Location
    The Lone Star State
    Posts
    7,699
    @soyer38301 is correct.
    The math isn't too difficult to do once you know the total battery capacity.
    Maine-Marine likes this.
    "Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats." - H. L. Mencken

  4. Remove Advertisements
    PrepperForums.net
    Advertisements
     

  5. #4
    Senior Member


    Join Date
    Dec 2012
    Location
    West WI
    Posts
    5,152
    Spend the extra couple bucks and get a Interstate battery.

  6. #5
    Senior Member


    Join Date
    Jul 2017
    Posts
    506
    I had decent luck with interstate batteries when I was running my wind genny. Worth the extra couple of bucks

    Sent from my SM-G892A using Tapatalk

  7. #6
    Senior Member


    Join Date
    Mar 2014
    Location
    Western PA
    Posts
    6,344
    We install solar on gas pads all the time

    a 105 amp hour battery will supply 12 volts at 1 amp for 105 hours, or 2 amps for 1/2 that, or 105 amps for 1 hour

    divide the amps need by the size of the battery


    ALSO - consider using a LOAD DISCONNECT device to turn off the load when power drops below the proper voltage


    >YMMV<
    soyer38301 and budgetprepp-n like this.
    Be a Berean

  8. #7
    Senior Member


    Join Date
    Jul 2017
    Posts
    506
    +1 on the load disconnect . Consider a load diversion device also if you think you might produce more than the battery needs. Cooked a battery before i added diversion...

    Sent from my SM-G892A using Tapatalk

  9. #8
    Senior Member


    Join Date
    Nov 2012
    Location
    North Central Ohio
    Posts
    3,578
    Example, . . . a battery with a listed life of 75 amp hours.

    That battery will produce 1 amp for 75 hours before needing to be fully recharged.

    An 8 watt bulb uses 2/3 of one amp (watt = volts X amps, . . . in this case 8 = 12 X .666, . . . with the watts and the volts being the known factors).

    Therefore if we have a 75 amp hour battery, . . . using 2/3 of an amp per hour, . . . divide 75 by 2 (37.5) and multiply it by 3 (112.5 hours).

    Gotta remember, . . . this is ALWAYS all theory, . . . and will work the very first time you use it, . . . in a controlled environment, . . . but after the units are all a bit on the old side, . . . slight differences will come about.

    May God bless,
    Dwight
    If you can breathe, . . . thank God.

    If you can read, . . . thank a teacher.

    If you are reading this in English, . . . thank a veteran.

    Hidden Content
    Hidden Content

  10. #9
    Senior Member


    Join Date
    Mar 2014
    Location
    Western PA
    Posts
    6,344
    Hint number 2

    get some LED lighting...

    I had a 50 watt panel , a sunsaver, and 1 55 AH battery on my wood shed with a strip of led lights... you could leave it on for days - my kids often forgot to turn it off and it will stay running forever
    Grinch2 likes this.
    Be a Berean

  11. #10
    Senior Member


    Join Date
    Apr 2013
    Posts
    2,464
    Quote Originally Posted by Maine-Marine View Post
    We install solar on gas pads all the time

    a 105 amp hour battery will supply 12 volts at 1 amp for 105 hours, or 2 amps for 1/2 that, or 105 amps for 1 hour

    divide the amps need by the size of the battery


    ALSO - consider using a LOAD DISCONNECT device to turn off the load when power drops below the proper voltage


    >YMMV<
    I'm using solar and a controller. That should take care of it.
    Taking your guns is like eating a whale,,,,,,One bite at a time

 

 
Page 1 of 3 1 2 3 LastLast

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. Replies: 8
    Last Post: 11-30-2017, 07:58 AM
  2. Flashlight Experiment extended run time
    By budgetprepp-n in forum DIY
    Replies: 9
    Last Post: 10-04-2017, 01:39 AM
  3. Augur, this is what will happen in Your LIFE TIME.... Yes, Your Life Time
    By Logicalpreppernewbee in forum UFO's, Zombies, 2012, Aliens, Mayan, End of the World, Apocalypse
    Replies: 11
    Last Post: 09-20-2014, 10:11 PM
  4. Math question,,,,,,,,how long will it run?
    By budgetprepp-n in forum Alternative Energy (Wind, Solar, Hydro etc)
    Replies: 18
    Last Post: 09-03-2014, 02:44 PM
Back to Top