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Thread: Hardwiring an Inverter

  1. #1
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    Hardwiring an Inverter

    Alright, so after a lot of reading on this forum I bought myself a Tripp-lite 375 Watts Inverter with a cig lighter connector. But after some more reading I understand that its advisable to hardwire the inverter to the battery. I plan to hook up my IBM laptop (16 V, 4.5A) and a 7 inch screen (undecided on the model) to this inverter.

    1. Can I use the cig lighter?
    2. Can somebody explain how exactly do i connect my invertor to the battery directly. Pls be elaborate a diagram would be awfully helpful.
    3. Do i need a relay etc? if yes, which one and how do i hook it up?

    Thanks !

  2. #2
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    This was v2 of my auto turn on circut before i went dc-dc. You shouldn't hook it up to the cigarette lighter, and you'll need a SPDT automotive relay.

  3. #3
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    Hmm, what is the purpose of the second SPDT with the green and gray cable connected to the laptop?

    Thanks for the diagram!

  4. #4
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    Quote Originally Posted by hellbent1 View Post
    Hmm, what is the purpose of the second SPDT with the green and gray cable connected to the laptop?

    Thanks for the diagram!
    He already told you...

    Quote Originally Posted by Cutrara View Post


    This was v2 of my auto turn on circut before i went dc-dc. You shouldn't hook it up to the cigarette lighter, and you'll need a SPDT automotive relay.
    auto turn on circut.
    You can remove that part of this circut if you just want to power the inverter via an on/off switch.
    Nice diagram, btw

  5. #5
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    Thanks, here is the final diagram. The 2 and 3 terminals connect to your power button, but i connected them to a 10 pin connector to the second and third terminals to simulate a power button press when the car is started. The power button does nothing when the computer is on, I disabled it in XP's power management software, in case I want to fill up with gas, restarting the car won't shut down the computer. I also ditched the inverter for a dc-dc power supply. It's not a "smart" power supply, I just hacked off the cigarette lighter plug for a 20v 4.5A Dell Auto/Air psu and connected it to my auto-turn on circuit. You'll also notice there is a third relay, the old design held in the power button, this effectively presses and releases the power button when the key is turned to "START"

    Good luck and PM me with any more questions.

  6. #6
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    Quote Originally Posted by Cutrara View Post


    This was v2 of my auto turn on circut before i went dc-dc. You shouldn't hook it up to the cigarette lighter, and you'll need a SPDT automotive relay.
    hello,
    I'm new to the board. This is my first post and i have a couple of question about hardwiring the inverter. right now i bought a 400watt inverter form advance auto part and i'm planning on using it for the playstation 2.

    1. the bottom relay the run to the inverter, is it suppose act as a on/off switch when i turn on ignition instead of flipping power switch on inverter itself?

    2. when i run a 8 or 10 gauge wire from inverter directly to battery, what size fuse should i use, cuz on the inverter it already havea 40amp fuse connected?

    3. can u give me the part number of the specific relay that i would need to get?

    4. I'm not hooking up a car pc, is there a way for me to make it so that when i start the car the power would not be interupt (as in everything shut down then i have to turn it on again)?

    5. i was looking into the carpc hobby an i notice that it is expensive to built a carpc. I was at compusa and saw a acer aspire minitower that look small enough to fit in glovebox or under seat, will it work in a car? would there be any difficulty with this thought that i have?
    Newegg.com - Acer Aspire ASL310-UD631A Core 2 Duo E6300(1.86GHz) 1GB DDR2 320GB Intel GMA 3000 Windows Vista Home Premium - Retail

    I apologize for so many question and thank you very much for your time.

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