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electrical advice.

  • 07-04-2014 6:20pm
    #1
    mr. blue
    Registered Users, Registered Users 2 Posts: 18 ✭


    hi just trying to make this here

    http://www.instructables.com/id/Mobile-Power-Anywhere/



    to power a bass amp and a guitar amp.

    I need the juice for about 2-3 hours

    what size of battery do you think I would need and what type of invertor do you think I should get and what charger.

    the bass amp readings are as follows: ac-230 v-50 hz 50w a-250v

    the guitar amp readings are as follows : ac in230v-50hz at -10w


    any advice would be of much benifit and greatly appericated.

    cheers.
    Tagged:


Comments

  • #2
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,591 Mod ✭✭✭✭Capt'n Midnight


    First up, the inverter outputs mains voltage. It is just as lethal as a wall socket. Given that we get measurable rain one hour in three in this country it's not suitable for outdoors use, especially in a public place.

    Check your guitar / amp to see if they can run off 12V or if you can get a 12V alternative.


    (10W + 50W) * 3 hours / 12 Volts = 15 Amp hours.

    Draining a battery to 0 is an excellent way to kill it so you need more than 15Ah

    Car batteries are 30-45 AH for size comparison. DO NOT USE car batteries, they are only designed for power and don't like deep discharges at all at all.


  • #3
    mr. blue
    Registered Users, Registered Users 2 Posts: 18 ✭mr. blue


    Capt'n Midnight wrote: »
    First up, the inverter outputs mains voltage. It is just as lethal as a wall socket. Given that we get measurable rain one hour in three in this country it's not suitable for outdoors use, especially in a public place.

    Check your guitar / amp to see if they can run off 12V or if you can get a 12V alternative.


    (10W + 50W) * 3 hours / 12 Volts = 15 Amp hours.

    Draining a battery to 0 is an excellent way to kill it so you need more than 15Ah

    Car batteries are 30-45 AH for size comparison. DO NOT USE car batteries, they are only designed for power and don't like deep discharges at all at all.

    So a deep cycle battery would do the trick eh ?

    Ah ill try to make the unit as water proof as possible and I'm not going to be using it in the rain. Thanks for the knowledge.


  • #4
    Chet T16
    Registered Users, Registered Users 2 Posts: 2,320 ✭✭✭Chet T16


    If powered from a battery the inverter output will not be earth referenced so it's not actually as dangerous as mains as you can touch one side without risk.

    Touching both will ruin your day.


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