The center tap output greatly reduces the cost of the DC-DC boost
converter which is the first stage of the inverter. If you wish to
tie the output neutral to ground, you must use an isolated DC-DC
boost converter which costs more than a non-isolated DC-DC converter.
Most folks (besides UL) don't care if the neutral blade is tied to
ground or not. As long as the ground is tied to chassis, and that is
tied to the negative terminal of the input, most folks don't care. I
can think of no modern commercial appliances that require that
neutral be at ground potential.
Bill D.
At 04:12 PM 10/1/2014, you wrote:
Jan,
I agree entirely but yes, it is for real.
Keep in mind that when using an inverter the ground to neutral tie is not
present from the mains as you are disconnected from the mains. When the
inverter is connected to the home / appliances it becomes the source of the
relationship between gnd, neut, hot. We have tested numerous product and all
of the less expensive stuff has the center tap output. We needed to instruct
our manufacturers that the neutral / gnd tie has to be there, it is more
expensive to manufacture, not sure why.
Mark
-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Jan Steinman via EV
Sent: Wednesday, October 01, 2014 6:06 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Chinese inverters legality?
> From: Mark Grasser via EV <ev@lists.evdl.org>
>
> Be careful buying non UL Asian inverters. A lot of them do not have a
> neutral to ground tie. You will find instead that the ground prong or
> green wire is actually tied to the center tap of the output and that
> NEUTRAL is 60 volts from ground and that HOT is 60 volts from ground.
This is rather hard to understand.
It would be a clear violation of the electrical code, and would result in a
breaker trip if anything was plugged in that had ground tied to neutral,
which could very well happen. (Ground and neutral are supposed to be at the
same potential.)
:::: Entirely new ways of living are necessary, and if we don't adobt them
voluntarily, we or our children will eventually adopt them involuntarily,
and probably with great pain and difficulty in the process. -- Thom Hartmann
:::: Jan Steinman, EcoReality Co-op ::::
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