square-wave inverter vs the world [RE-wrenches]

[Mark Edmunds]

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Hi Ray,

The SW Plus units do search at 8W, though at that low power level the exact
threshold may be off by a Watt or two. Any chance you have a phantom load
that is not coming on below 16W?

On the mod sine stuff, they definitely do have their place for low cost
systems, though some TV's will show some horizontal ghosting bars due to the
high frequency harmonics on the line.

Best,

Mark Edmunds
Xantrex Technology Inc.

-----Original Message-----
From: Ray Walters [mailto:ray at solarray.com]
Sent: Thursday, June 10, 2004 3:16 PM
To: RE-wrenches at topica.com
Subject: square-wave inverter vs the world [RE-wrenches]


 

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I know the list hates Mod square wave inverters, but I still use them all 
the time for systems under $10,000. They work, they surge, their efficient, 
and I have never lost any tools or equipment to the poor wave form in the 5 
years of running my whole shop on a DR2424, nor have any of my customers 
had any problems beyond some extra buzz. They definitely have their place. 
I am using more of the SW plus series; when  charging from a generator it 
definitely is more efficient than a mod sine, but I have never been able to 
get it to search below the 16 watt setting. Any other wrenches have a trick 
to get the SW+ to search at the 8 watt setting as advertised?

Ray



  be At 01:44 PM 6/10/2004, you wrote:
>
>
>-----------------------------------------------------------
>Let University of Phoenix make 2004 your year. Evening,
>weekend or FlexNet® classes ­ over 130 locations. Look
>into our programs and get the degree that gets you going!
>http://click.topica.com/caaciq1bz8QcsbeuiVOa/UOP
>-----------------------------------------------------------
>
>
>
>
>Hi Todd,
>
>I generally don't use square wave inverters, either. The exception is for
>small, infrequently used applications, where the budget is a factor. This
>particular system is a PV retrofit in an old RV, which the recently-retired
>owners are going to live in full-time. There aren't many AC loads. The
micro
>and TV are my major concerns for performance. The difference in price
>between the SW inverter and a square-wave could be 20% of the overall
system
>cost. If the TV and micro run on the cheaper inverter, then why not?
>
>My customers have already expressed shock at my initial estimate cost. They
>now want me to reduce the array size and run the generator more. In my mind
>it's better to spend the $$ on PV's rather than the inverter. Less
>generator noise and exhaust is a good thing.
>
>-Kelly
>
>
>----- Original Message -----
>From: "Todd Cory" <toddcory at finestplanet.com>
>To: <kelly at whidbeysunwind.com>
>Sent: Thursday, June 10, 2004 6:16 AM
>Subject: Re: Plasma TV on square-wave inverter [RE-wrenches]
>
>
> > Hi Kelly,
> >
> > Just a heads up that I NEVER put in square wave inverters anymore. The
>price
> > difference between these pieces of junk and a nice SW inverter is
>insignificant
> > when you consider the advantages of having real sine wave power for the
>client.
> > No more "will it work on a square wave" questions. No more hum and buzz
>es, no
> > more smoked (whoops it doesn't work on "our" power) events, higher
>efficiencies
> > on most appliances.
> >
> > Todd
> > Todd Cory
> > KE6SXS
> > toddcory at finestplanet.com
> > Mt. Shasta Energy Services>
> >
> >
> > Kelly Keilwitz wrote:
> >
> > > Jeff & Tom,
> > > It turns out that my customers know less about plasma TV's than I do.
> > > What they really want is a "flat (LCD) screen". I didn't know enough
to
> > > correct them. Now I do. Thanks .
> > >
> > > I'll definitely be interested in hearing if the LCD TV operates OK on
>the
> > > U-series inverter. I would think that the LCD TV converts the AC to
DC,
>like
> > > my LCD computer monitor.
> > >
> > > -Kelly
> > > Kelly Keilwitz, P.E.
> > > Whidbey Sun & Wind
> > > Renewable Energy Systems
> > > kelly at whidbeysunwind.com
> > > Ph & Fax: 360-678-7131
> > > Renewable Energy Now!
> > >
>
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