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Inverter output question?
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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
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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 |
#5
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Inverter output question?
So in short, there seems to be two likely candidates:
1) inverter or plug is wired 'Upside Down'. 2)Inverter is not connecting Neutral to Ground while in 'invert' mode. I know the ProSine units have a relay that does this function, and also know it can be defeated. So, a couple of areas to check out. -al- 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. 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 |
#6
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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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