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

[Kurt Nelson]

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Hey Ray,

A couple thoughts.  I also do use the DRs in about half the systems I am
installing, but then I'm doing a lot of cabin systems as well as a lot of
systems where the folks really don't have a lot of cash and the DR can
usually do what needs to be done (perhaps less problematic and bullet proof,
at least when compared to the SW).

A couple thoughts.  First the usual deliberate phantom load when running a
washer (or something) that may enter a timer pause that falls below the
search setting.  A night light plugged into a switched outlet next to the
stove or washer, sometimes with a crank timer.  Also, with some smaller
items like cordless tool chargers, I mentioned in a previous post that I
ocasionally power them from a relay pulled in by something like the
thermostat on the home's refrigerator.  Tie the 120vac relay coil to the
compressor connection in the box attached to the compressor and everytime
the frig powers up the inverter, the circuit powering the chargers power
strip power up as well.  This power strip can be remote --  you don't need
to store your electric shaver in the butter dish.

That said, I also have a client who loves the fact that his 4024 drops the
electric shaver charger,  as it stays fully charged when the inverter is
otherwise powered up and yet is not a phantom load on its own.

Kurt nelson


----- Original Message -----
From: Ray Walters <ray at solarray.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, June 10, 2004 2:15 PM
Subject: square-wave inverter vs the world [RE-wrenches]


>
>
> -----------------------------------------------------------
> 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/caaciq1bz8QcsbAsGU2a/UOP
> -----------------------------------------------------------
>
>
>
>
> 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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