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Statpower (Now Xantrex) Prowatt 1500 inverter shuts down

Discussion in 'Electronic Repair' started by Ray, Sep 25, 2005.

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  1. Ray

    Ray Guest

    I have a Statpower Prowatt 1500 Inverter that will fire up for about 2
    seconds with enough power to light up all my lights (At least 300 Watts)
    Then it shuts down with the overload light on.

    I have replaced this unit with a prowatt 1750, as Xantrex has no repair
    facility or repair info available. I had hoped I would be able to some
    comparison checking to determine what is wrong with the old one, but they
    are too physically different.

    Has anyone any info, even a block diagram of how the inverter works ?
    Especially the shut down circuit.
    Even a generic schematic might help.
    I dont think there can be much wrong, as it fires up for 2 seconds..

  2. Guest

    If you reduce the load to 100 W or even 50 W, does the inverter stay on
    for longer? If it uses sealed lead-acid batteries (gel cells), and the
    batteries are over 5 years old, they are most likely junk. Between 3 and
    5 years old, they might be junk. Fortunately these batteries come in a
    standard-ish range of sizes from several manufacturers; I have had good
    luck with Panasonic and Power-Sonic gel cells.

    If you're unsure about the battery, the simplest test is to disconnect it
    and measure its voltage. Around 6.3 V (6 V nominal) or 12.6 V (12 V
    nominal) is probably pretty good. Down to maybe 6.0 V or 12.0 V might be
    salvageable. If it's way lower than these, like less than 4.0 V or 8.0 V,
    the battery is junk. If you think the battery might be salvageable, hook
    it back up and leave the inverter plugged into the wall but not powering
    anything for a day. Then disconnect the battery again and check the
    voltage. If it came up significantly, there is hope, but if not, get
    some new batteries. You might try measuring the battery voltage while
    the inverter is starting; if it drops too low the inverter will shut
    itself off. This may be difficult to do in the short time you have;
    another test is to take the battery out of the UPS and load it with
    something like a car tail light bulb to see what the voltage does. The
    on-load voltage will always be a little less than the no-load voltage,
    but if you use a typical tail light bulb (about 2 A) and get 12.6 V
    no-load and less than about 11.5 V on load, the battery is probably

    Be careful when fooling with inverters; they are designed to make
    line/mains voltage at a fair amount of current.

    Matt Roberds
  3. Ray

    Ray Guest

    The inverter stays on for 2 seconds no matter what the load. The
    batteries are fine, as stated, a new inverter works fine on the same

    I have a fair amount of experience with electronics, just need some
    pointing in the right direction.

  4. Mark

    Mark Guest

    the inverter i have will shutdown for several reasons including:

    1) low input voltage
    2) ground fault at the output

    the ground fault is a strange one, the inverters actually produce a
    voltage on both the hot and netral output and if there is any fault
    form either the hot or neautral to the ground pin, the inverter will
    shut down, it does this by using a small resistor in series with the
    ground lead and if it senses any small voltage across this resiostor
    it will shut down.

    I wold check the low voltage and ground fault sensing circuits..
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