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  • #1

    Small Home System TV problems

    Hi there,

    I apologize if this was already covered but a search yielded no fruit.

    I'm putting together a small home system and I was running some tests tonight.

    I have a 12v 50ah battery connected to a 1000w inverter. I then ran an extension cord into the house and plugged it into a 2005 Panasonic 42" Plasma TV rated at 275watts 50-50hz 110v.

    While it looked like it was going to turn on it was making an audible noise that does not occur when plugged into grid AC.

    I then plugged the extension cord into a power strip that detected a "line fault". That being said I was able to plug a cable box and DVD into the power strip and they ran fine.

    The power strip is quite old so I'm not sure I can rely on the error it displayed but I'm wondering what I'm doing wrong?

    Any insight would be appreciated and please pardon my ignorance, I'm still learning

    Thanks!

    Mott
    Tags: None
  • #2
    TV probably needs a true sine wave, and you probably have a modified square wave output inverter. If I had to take a guess, that would be it.

    Either that or the system voltage is falling due to loading.

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    • #3
      Originally posted by boostinsteve View Post
      TV probably needs a true sine wave, and you probably have a modified square wave output inverter. If I had to take a guess, that would be it.
      Either that or the system voltage is falling due to loading.
      Ditto My thoughts exactly. 1Kw inverter is also going to have lots of overhead losses, look for a 500w pure sine.
      Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
      || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
      || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

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      • #4
        Thank you. I'll try that. As I'm looking to hook up a few more devices to the same inverter, any reason I shouldn't go with a 1000w pure sine wave inverter?

        Comment

        • #5
          Originally posted by MottMcFly View Post
          Thank you. I'll try that. As I'm looking to hook up a few more devices to the same inverter, any reason I shouldn't go with a 1000w pure sine wave inverter?
          You have to deal with greater losses due to the bigger inverter. As long as the battery and the charging system can take the extra losses, you'll be fine.

          Comment

          • #6
            Originally posted by MottMcFly View Post
            Thank you. I'll try that. As I'm looking to hook up a few more devices to the same inverter, any reason I shouldn't go with a 1000w pure sine wave inverter?
            Your battery is way too small for 1000 watts inverter, that is why you have problems.

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            • #7
              Originally posted by MottMcFly View Post
              I have a 12v 50ah battery connected to a 1000w inverter. I then ran an extension cord into the house and plugged it into a 2005 Panasonic 42" Plasma TV rated at 275watts 50-50hz 110v.

              While it looked like it was going to turn on it was making an audible noise that does not occur when plugged into grid AC.
              You have a couple of problems. My bet is your inverter is being under powered by a 12 volt 50 AH battery. A 50 AH battery cam only really handle a 100 watt inverter. With your 275 load of a TV is just way to much for your bat600 AH battery. For a 1000 watt inverter you need at least a 600 AH battery.
              MSEE, PE

              Comment

              • #8
                Originally posted by Sunking View Post
                You have a couple of problems. My bet is your inverter is being under powered by a 12 volt 50 AH battery. A 50 AH battery cam only really handle a 100 watt inverter. With your 275 load of a TV is just way to much for your bat600 AH battery. For a 1000 watt inverter you need at least a 600 AH battery.
                Understood and thank you.

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