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Gerald55's avatar
Gerald55
Explorer
Dec 28, 2015

Xantrex ProWatt SW inverter neutral bonded to ground?

Anyone out there have the ProWatt SW inverter and were able to determine if the ground and neutral are bonded on the AC output side?

Some of Xantrex's smaller inverters explicitly state that they are not bonded and hence you have a floating neutral with ~60V relative to ground. Some of the other Xantrex products explicitly mention bonding (such as the switched products that can pass through incoming AC with a built-in transfer switch).

I can't find anything on the ProWatt SW though and haven't heard back from Xantrex.

The inverter itself has only a "chassis ground" terminal, so if it's bonded at all, it must be using that ground?

34 Replies

  • The difference is that some are grid tie and some are mobile applications. Mobile will be stickered or in operators manual as UL458. My prowatt SW 600 is bonded and it is that ul rating.

    UL458

    EDIT: My book says it's UL458
    I thought it was on the unit also but it's installed in a cabinet and I can no longer see it.

    I recently worked on a friends rig and found that they bonded the sub panel. His magnum inverter charger has pass through so it has a GB relay. When shore power is off the relay bonds the inverter. When shore power is connected the relay removes the inverter (downstream) bond. Our prowatts are always bonded.
  • Gerald55 wrote:
    Anyone out there have the ProWatt SW inverter and were able to determine if the ground and neutral are bonded on the AC output side?


    Here's a post from several years ago on a boating website which more directly address your concerns -

    "Posted - Apr 08 2008 : 11:47:24

    SOME Xantrex inverters (such as the X-power) run 60v on the hot and 60v on the neutral. Some run 120v on the hot and 0v on the neutral (Pro-watt). If you ground the neutral on an Xpower, you've just fried the inverter (Been-there-done-that). Other brands may be either way.

    If the unit is DESIGNED to be hard-wired in, My guess it's the 120-0 setup and is "bonded". If it's just designed to run portable tools, etc, it may not be. If any doubt test it first, you might want to take it back. If you're still shopping, call tech support.

    The little plug-in testers work great. If the tester show two yellows and AND a red light, you've got a 60-60 inverter. If the tester shows two yellows and NO red light you've got a 120-0 inverter."
  • With a 60/60 interface would a G/N resistence test -power OFF meaning totally disconnected, yield a 0.0 ohms reading?
  • Gerald55 wrote:
    Some of Xantrex's smaller inverters explicitly state that they are not bonded and hence you have a floating neutral with ~60V relative to ground.


    Seems to me you're confusing G-N bonding a floating neutral output with a particular wiring scheme used in some inverter designs in which the neutral is 60/60 centre bonded so the neutral and ground are intended to always always remain ~ 60 volts apart, thereby eliminating any possibility of G-N bonding the unit. I own a Motomaster branded true sign wave inverter sold here in Canada by Canadian Tire and because it is not a 60/60 neutral center bonded design it can be G-N bonded, which is necessary if I want to feed it's output through my Progressive Industries EMS-HW30C surge protector as the EMS would otherwise detect what it thinks is an "open ground" error and not pass the signal.

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