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Thread: battery drainage, possible fix?

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    Newbie post_break's Avatar
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    battery drainage, possible fix?

    Well Im new to this and have looked around a bit but didnt see anything on my idea. I read that if you leave an inverter plugged into your battery it will still drain power even if it is off. Now I got to thinking, if its attatched to the battery it will drain, what if I throw in a switch to completely disconnect the inverter from the battery. I really hope this isnt a reoccuring thread topic, if so then feel free to delete it.

  2. #2
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    Bugbyte's Avatar
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    That would work.
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    Constant Bitrate RawsonDR's Avatar
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    I don't think an inverter that is off will draw any power. I believe the issue is that an inverter that is on, but not powering any devices, will still draw a small amount of power. Your switch would then only need to perform the same function as the on/off switch on the inverter.

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    Newbie post_break's Avatar
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    The inverter I have has a switch to turn it on and off which I have lengthened so I can access it in the car but it has an led which drains very little power. I think I would be fine if I drove my car at least once every 2 or 3 days I guess.

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    Constant Bitrate RawsonDR's Avatar
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    The LED is on even if the switch is OFF?

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    Newbie post_break's Avatar
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    Yeah, odd. I dont know why it does that. I started my car the other day with everything plugged in but off. She didnt want to start. I have no idea why. Unplugged it from the cigarette lighter and it started. Could have been a fluke.

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    Constant Bitrate RawsonDR's Avatar
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    With the invert plugged in and turned off, your car wouldn't start? That's really odd.

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    Newbie post_break's Avatar
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    Yeah, well its not that it didnt start, it just didnt sound like it wanted to. You know what I mean, it didnt sound like a normal start. It didnt start on the first turn.

  9. #9
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    With the car off can you power the inverter with the cig lighter? I know a lot of cars now have it set up so you can't power anything in the cig lighter until the car is at least in the ACC position to prevent battery drainage. Is this the case with your car or does it get power even when the car is off?

  10. #10
    FLAC evandude's Avatar
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    if you have a multimeter, you can easily measure how much current it's drawing while it's switched off. I wouldn't expect it to draw much, but many inverters are pretty cheaply made so I wouldn't be surprised if it was poorly designed... If it is drawing more than it should, then a relay cutting power to it is a good solution, just make sure you get a relay that can handle enough current when the inverter is actually running (ie - get one with a current rating higher than the value of the fuse that's in the inverter)
    But don't take it from me! here's a quote from a real, live newbie:
    Quote Originally Posted by Viscouse
    I am learning buttloads just by searching on this forum. I've learned 2 big things so far: 1-it's been done before, and 2-if it hasn't, there is a way to do it.
    eegeek.net

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