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Merge power from car battery and normal electrical supply

Discussion in 'Power Electronics' started by Ravi Beekharee, Apr 27, 2017.

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  1. Ravi Beekharee

    Ravi Beekharee

    Apr 27, 2017
    Hello Everyone
    Im opening a snack in which i need emergency lights as well as normal lights.

    I have a car battery, a 12 v to 240 v inverter, 2 auxiliary contactors, and electricity supply.

    I connected the inverter to the battery.. Then 1 contactor.

    On the other hand i connected the other contactor to the electricity supply.

    As soon as i switch on the invertor and switch on the electrical supply, the invertor is short circuited.

    Any help plz to solve my problem?
  2. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Emergency lighting
    You need to see while eating your snack?

    Did you mean emergency egress lighting for a shack?

    Why not just use 12v lighting so you don't have to use the inverter?

    You can buy a stand alone emergency lighting relatively cheap.
  3. Minder


    Apr 24, 2015
    Maybe a Dhaba?
  4. Ravi Beekharee

    Ravi Beekharee

    Apr 27, 2017
    Not a dhaba indeed. We are not in india.
    Stand alone emergency light could be useful but im looking for a long term solution.
  5. Bluejets


    Oct 5, 2014
    Emergency egress lighting is normally looked upon as long term where I come from.
    Tha fios agaibh likes this.
  6. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Are you trying to make standby system?
    Ravi Beekharee likes this.
  7. davenn

    davenn Moderator

    Sep 5, 2009
    see an electrician

    there are very specific ways to merge 2 different supplies. This is for safety reasons in case something fails and during incoming
    mains power blackout your system doesn't accidentally put mains voltage out onto the power lines and electrocute some poor
    power technician working on the outside lines

    again use correct gear and see an electrician

    thread closed
    hevans1944 likes this.
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