power inverter cap

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  • justinf89
    New Member
    • Jun 2011
    • 5

    #1

    power inverter cap

    Hey guys, first post. I've been looking over this forum for a few weeks now. It's pretty neat that there's a website dedicated to caps. I'm a computer/electrical engineer in college so I do have a little knowledge.

    Here's my question. I started a project today to wire up a 500w power inverter on my boat. I grabbed the inverter (vector sst max 500w) to test it with the alligator clips it came with, and about 5 seconds later, wham a lam, a huge pop from it and it shut off. Of course, I was up close looking at the led since it was bright out. Anyway, I've never used this inverter and it's probably been sitting for about 2 years on the shelf. After the loud pop, it turns back on normal but no voltage. I opened it up and sure enough, one of the 2 caps I can see had popped out the top and tore off the wire underneath(+). The caps are 4700uF xunda 105c 16v. I'd like to repair it but my question is, could there be something else wrong that would cause the cap to explode like this? I don't want to replace it and it happen again. All I did was clip it to the battery, no load, turn it on, and boom, explosion. My neighbor even looked over to see what happened. I even checked the polarity of the clips just to be sure I wasn't stupid or something but all was well.

    Please feel free to move this if it's not in the right place. Thanks guys.

    EDIT: After cutting all the wires and sliding the board out, it looks like the other 16v cap is bulged too. The 160v is a different brand and is fine. I assume because there was no load on it. What's kind of odd is there are no internal fuses either. Here's a pic. The other 16v cap is in the middle.

    Last edited by justinf89; 06-03-2011, 02:39 PM.
  • Th3_uN1Qu3
    Believe in
    • Jul 2010
    • 6031
    • Romania

    #2
    Re: power inverter cap

    Originally posted by justinf89
    The caps are 4700uF xunda 105c 16v. I'd like to repair it but my question is, could there be something else wrong that would cause the cap to explode like this? I don't want to replace it and it happen again.
    Are you sure your boat doesn't use 24 volts?
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

    Comment

    • justinf89
      New Member
      • Jun 2011
      • 5

      #3
      Re: power inverter cap

      haha no it doesn't but I tried this on the car battery anyway.
      Last edited by justinf89; 06-03-2011, 03:41 PM.

      Comment

      • Th3_uN1Qu3
        Believe in
        • Jul 2010
        • 6031
        • Romania

        #4
        Re: power inverter cap

        Then go ahead and replace the caps then try it again. It's quite possible that the caps have lost their voltage holding capacity because they haven't been used.
        Originally posted by PeteS in CA
        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
        A working TV? How boring!

        Comment

        • justinf89
          New Member
          • Jun 2011
          • 5

          #5
          Re: power inverter cap

          Alright I picked up 2 panasonic caps and it took me more time to re-splice all the wires than to solder the caps in. I did find a great way to clear the holes to stick the caps through. I took a small drill bit (1/32) and drilled out the holes. It's a lot easier since I didn't have a stainless pick. Anyway, the inverter works great now! I put a dc load of 30a on it and it did fine for about 5 min so I'm pretty happy. I'm just glad the caps were the only thing wrong with it.

          Comment

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