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Jim Woodward
 
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Default Inverter output question?

I respectfully disagree.

A reverse polarity indicator is usually just a light wired from the
neutral (white) to the ground (green). Most of them are not
sophisticated enough to be set off by a messy waveform.

I would bet on Curtis's guess -- an upside down outlet.

Generalizing about inverters is a little dangerous -- some of the
imports are strange -- but at the low end, they usually have ordinary
outlets, and at the high end, terminals for connections, and, yes, the
neutral and the hot are marked as such.

Jim Woodward
www.mvfintry.com

(Larry W4CSC) wrote in message ...
On 2 Sep 2003 18:45:04 -0700,
(Curtis CCR)
wrote:

Do inverters put out 120VAC with a hot and neutral (the way most
expect to see 120), or is there voltage on both sides? I ask because
a got a "reversed polarity" indication when I plugged my boat into a
friend's boat over the weekend.


It's isolated from ground and might give you this indication.

What battery did he have in his diesel submarine?....(c;

He has an inverter but no gen set. I have a gen set but no inverter.
He doesn't run much on his boat except a 120V fridge, so when we raft
up together I usually let him plug in to my boat to get a charge when
my generator is on. My generator quit the other night so I plugged
into him to run my 120V fridge for the night (we were heading back in
to next morning).




I am thinking he has an "upsidedown" outlet, but I wasn't about to
tear his boat apart at 10PM to figure it out. But then I thought
maybe the inverter output was causing it.

Thanks


It's probably the inverter. It isn't "dock power". The digital
remnants in the synthesized sinewave could have also triggered your
alarm.


Larry

Extremely intelligent life must exist in the universe.
You can tell because they never tried to contact us.

  #3   Report Post  
Charlie J
 
Posts: n/a
Default Inverter output question?

Curtis: An inveter produces 120VAC hot to common and hot to ground.
Larry: If this is a name brand marine inverter mfgd and installed IAW ABYC
Standards, then the safety ground and the neutral wire are tied together
when the inverter is producing 120VAC. Assuming that Curtis' receptacle is
wired correctly, I suspect that Curtis is right, he plugged into an outlet
on his friend's boat that had reversed polarity.

73-
Charlie


  #4   Report Post  
Jim Woodward
 
Posts: n/a
Default Inverter output question?

There's a catch:

Charlie says, "then the safety ground and the neutral wire are tied
together
when the inverter is producing 120VAC."

This is exactly right, but they must not be tied together when the
boat is plugged into shore power unless the boat has an isolation
transformer. This is a source of confusion and problems on boats of
all sizes.

The rule is that the neutral/safety tie (white to green) in any system
should be at one and only one place. When plugged into shore power,
it's at the service entrance for the marina power. When generating
power on board (genset or inverter), it's on board. This requires
switching, which the better inverters provide automatically, but is
ignored in many installations.

Jim Woodward
www.mvfintry.com

"Charlie J" wrote in message .. .
Curtis: An inveter produces 120VAC hot to common and hot to ground.
Larry: If this is a name brand marine inverter mfgd and installed IAW ABYC
Standards, then the safety ground and the neutral wire are tied together
when the inverter is producing 120VAC. Assuming that Curtis' receptacle is
wired correctly, I suspect that Curtis is right, he plugged into an outlet
on his friend's boat that had reversed polarity.

73-
Charlie

  #6   Report Post  
HeTalksRubbish
 
Posts: n/a
Default Inverter output question?

(Larry W4CSC) again attempted to bull**** the world with his
partial knowledge of marine electronics with this gem of a piece of
bull****.......

On 2 Sep 2003 18:45:04 -0700,
(Curtis CCR)
wrote:

Do inverters put out 120VAC with a hot and neutral (the way most
expect to see 120), or is there voltage on both sides? I ask because
a got a "reversed polarity" indication when I plugged my boat into a
friend's boat over the weekend.


It's isolated from ground and might give you this indication.


Correction......

It *might* be isolated and *will* give this indication of that is the case.

[snipped]


I am thinking he has an "upsidedown" outlet, but I wasn't about to
tear his boat apart at 10PM to figure it out. But then I thought
maybe the inverter output was causing it.

Thanks


It's probably the inverter. It isn't "dock power".


You don't say !

The digital
remnants in the synthesized sinewave could have also triggered your
alarm.


Not heard so much crap since the last time you typed something in this
newsgroup Larry.

"digital remnants in the synthesized sinewave" ??????

Shut that fat hole in your face before you make a complete **** of yourself....
oh wait... too late.

It's because the two outputs of *most* inverters are not connected in anyway to
the ground connection. They are floating.

Stray capacitance will *usually* mean a measurement from either hot1 or hot2 to
ground will show about half line voltage. This is usually sufficient to trigger
a reverse polarity indicator.

Other inverters have a rather strange output where each of the live outputs is
alternately connected to ground on each half cycle. This seems odd but does
infact work perfectly satisfactorily. This too will usually trigger up a
reverse polairty indicator.

Larry. The beginners books you're reading either are crap or you simply don't
understand them.

Have you tried cooking or fishing ? Something that doesn't tax your brain too
much.

Extremely intelligent life must exist in the universe.


Not in your house.

You can tell because they never tried to contact us.


Well they won't bother with you.

Actually YOU talk rubbish
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