SW Efficiency/ PWM Angle Adjustment [RE-wrenches]

[Bill Brooks]

Joel and Ezra,

I am glad to hear Joel's experience corroborated my findings. This is a fix
only necessary for ETL-listed units operating in Sell mode with the grid. It
is unlikely Trace will issue a tech bulletin on this subject since it
encourages entrance into the tech menus which can be dangerous if other
settings are changed. However, there is a very real performance benefit that
results.

For all those that want to "hop up" their inverters and make them run
better--this is a big help. Especially if the system has an array larger
than 3000 Watts STC. Remember this was a programming error that was not
discovered until we started putting lots of these units on the grid.

I guess this proves to all those who doubted that the suggestion was not an
official Xantrex communication. Be assured that if you make this change, it
will make your inverter last longer, not shorter, and more of your precious
PV electrons will be converted into useful electricity.

Bill.


> -----Original Message-----
> From: Joel Davidson [mailto:joeldavidson at earthlink.net]
> Sent: Wednesday, September 19, 2001 8:49 AM
> To: RE-wrenches at topica.com
> Subject: Re: SW Efficiency/ PWM Angle Adjustment [RE-wrenches]
>
>
> I changed the PWM on my SW4048 from 129 to 126 the day after Bill
> Brooks' post.
> My inverter buzzing is quieter and the fan, that use to come on
> every sunny day,
> has not come on. Instead of threatening to void the warranty, new
> Xantrex should
> tap field expertise by providing information about settings,
> adjustments, test
> procedures, etc. to field electrical and electronics engineers as
> did old Trace.
>
> "Ezra Auerbach, Trace Engineering" wrote:
>
> > Hi All,
> >
> > Sorry to wade in here so far after the discussion, but I've
> been caught out
> > in the wide world and getting back across Canada precluded
> email access.  I
> > have read this dialogue with some interest, though I hasten to
> add that I am
> > not a setting tinker, and stay as far away from the tech menu as
> > circumstances will allow.
> >
> > I forwarded some of the comments and suggestions being made
> about altering
> > factory default settings to one of our Engineers. He was kind
> enough to send
> > me a thorough report which concluded with the following
> passages.  I concur
> > with the recommendations.
> >
> > "It was not intended to be used in the field unless under controlled
> > conditions using certain equipment by our tech support group.
> > It is our position that this is a tech menu supported function only and
> > should not be used in the field, unless authorized by tech
> support, or other
> > qualified personal from Xantrex. Any other changes within the
> tech menu that
> > are missadjusted could cause damage that may void the warranty."
> >
> > Best regards,
> >
> > Ezra
> >
> > ----- Original Message -----
> > From: "Mr. Sharkey" <sharkey at eugeneweb.com>
> > To: <RE-wrenches at topica.com>
> > Sent: Thursday, September 06, 2001 10:31 PM
> > Subject: Re : SW Efficiency/ PWM Angle Adjustment [RE-wrenches]
> >
> > >
> > > Bill;
> > >
> > > Apology accepted.
> > >
> > > > I had been working in
> > > >the field all day troubleshooting systems and was pissed off with the
> > > >mistakes I found and was little on edge when I got your message.
> > >
> > > Maybe you should consider finding a less stressful means of
> employment.
> > >
> > > >it appears that you still are not convinced
> > >
> > > Well, yes, I have a bit of doubt that a one-size-fits-all
> setting is the
> > > optimum for every installation, but have no means of deciding if the
> > > alternatives are any better than the factory default. I would still be
> > > interested in knowing what the power factor actually is on a typical
> > > installation, and how much that is varied by the setting of
> the PWM Angle
> > > adjustment. If I'm seeing a 30% change in (amp clamp) current
> from one end
> > > of the setting to the other, what percentage change in power factor is
> > > taking place? As much as 30%?
> > > BTW My SW 2512 is UL listed, and it has the default as 129.
> It's a very
> > > early model, serial #00013, so it appears that not all of the
> UL listed
> > > inverters got the fix.
> > >
> > > -S
> > >
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> > >
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