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Thread: Inverter + Relay question...suck on

  1. #1
    Low Bitrate Shayughul's Avatar
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    Inverter + Relay question...stuck on

    The title says it all really.

    I have a inverter in the trunk using a 30Amp auto relay from the Shack.

    For some reason it seems to be stuck on.

    I have read about using a diode on the ACC line to the relay but not sure if that will help my issue. Also I have no idea how to wire a diode into the line.

    Any suggestions?

    Thanks.

  2. #2
    Maximum Bitrate falconey's Avatar
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    I don't think the diode has anything to do with it staying on. You probably have the relay wired incorrectly. You should have one line ACC/IGN and one line coming directly from the battery. You'll have to research to find out which # prong on the relay to place each one of those wires. You'll also need to ground the other two prongs on the relay. I think the diode has something to do with back flow of current so again I don't really think that's your issue.

  3. #3
    Low Bitrate Shayughul's Avatar
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    Thanks for the quick reply...I forgot to mention that this has been working fine for approx 2 weeks. Shuts off with ignition like it should.

    Then all of a sudden it would get stuck on....I replaced the relay once and that fixed it but I don't really wanna have to replace a relay ever month....heh

  4. #4
    MySQL Error MatrixPC's Avatar
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    Double check if you connect the relay correctly.
    For automobile type relay. Well you probably already know it, but what the .......
    85 connects to Ground
    86 connects to car's ACC/IGN (85 and 86 can be reversed)
    30 connects to Battery (+) with inline fuse.
    87 connects to Inverter (+).
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
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  5. #5
    Maximum Bitrate falconey's Avatar
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    OK so this could be a diode issue or it could be that you have too much current flow for the size relay ur using. Either way I'm going to bow out just to make sure I don't tell you the wrong thing. Using deductive reasoning though, if it was working and you've done nothing differently since, I'd assume it's something to do with the diode or the relay isn't able to handle the amount of current. So do you have some sort of shutdown control for the computer as well. If so maybe you can help me figure out to finish my setup.

  6. #6
    Low Bitrate Shayughul's Avatar
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    Heh...well I don't actaully have a diode in place right now....so that very well could be the issue.

    I double checked the wiring right now and its all hooked up right.

    Oh and no shutdown controller....heh...I just put a power button up front...so when I am about to reach my destination I hibernate the PC...press the power button and then when I turn off the car that cuts the power.

    Kinda primitive but that is how it is till I get the cash for a opus.

  7. #7
    Maximum Bitrate falconey's Avatar
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    So why do you have a relay for the inverter. If you wired a switch wouldn't that have been enough? Anyways I have a thread about this that I started today, but you are halfway to a shutdown controller of sorts. Check my thread and it has a link to how to do it.

  8. #8
    Variable Bitrate cheerio's Avatar
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    If its killing your relay then you dont have a fuse hooked up (bad bad BAD!). First step is to get a inline fuse block, and wire it betwen the battery and the relay, and your next step is to make sure that your relay is 30/40 amps, 40 IS important, at least for me it was :x i hooked up a 20/30 amp relay and blew it and a main distrobution block fuse. You should also check if it is SPDT, or DPST. You might want to get it from autozone or something, radio shack sucks. The ones here just usualy have 1 automotive relay in stock.

  9. #9
    Raw Wave
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    So the relay is stuck even without the power in the coil?

    Look like you have exceeded the relay switching capacity and the contact may have fused together...ie stucked.

    It also possible that the relay you are using is not a good quality type where the switch contact tend to get erroded easily. Whenever the relays switches on, a heavy current drain from the inverter cause spark to fly in between the relays switch contacts...eventually they can fuse together.

    Check the current drain from your inverter and match it with a good heavy duty relay.

    Argg...cant explain better than that hope it make sense anyway

  10. #10
    Low Bitrate Shayughul's Avatar
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    Quote Originally Posted by falconey
    So why do you have a relay for the inverter. If you wired a switch wouldn't that have been enough? Anyways I have a thread about this that I started today, but you are halfway to a shutdown controller of sorts. Check my thread and it has a link to how to do it.

    I have the relay because I don't want my inverter running all the time while my car is turned off...the relay cuts the power to the inverter when the Acc line is switched off....

    As to the other responses....I do have a fuse...about 3 inches from the battery...so that isn't the issue.

    No idea how to check if the relay is a 20/30 or a 30/40.....I know nothing about electronics FYI =)

    I know I went to Radio Shack and bought the only relay they had in store which was labeled as a 30Amp Auto relay.

    =) About the diode thou....is it required to have one between the ACC source and the relay? and if so is there such a thing as a inline Diode that is similar to a fuse like that?

    Thanks for all the responses so far...keep em coming.....thanks

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