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small solar grid intertie inverters?

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Posted by Jason on May 16, 2004, 9:37 pm
 
Hi,
I was wondering if there is still a small grid intertie
inverter available on the market for the 100 watt range.
I remember there used to be a great and inexpensive one
called the Trace Microsine inverter that was specifically
made for low watt interties, you could plug it directly
in a wall socket in your house to attach to the grid. I
think this model is no longer being made, is there anything
comparable?  I don't have the money to start with the
Sunny Boy 700 at $300 (plus the panels) but i would like
to take what panels I have and start using them as they
are doing me no good in the basement.

thanks,
Jason



Posted by William P.N. Smith on May 16, 2004, 10:58 pm
 

Unfortunately, those weren't UL-<something> listed, and (except for
the occasional eBay listing) aren't available for sale here any more.
The problem is that UL-<something> testing and certification costs
enough to make the price of the inverter $000+($.50/W), so there
aren't any cheap answers.

--
William Smith
ComputerSmiths Consulting, Inc.    www.compusmiths.com

Posted by Solar Guppy on May 17, 2004, 1:53 am
 : quoted-printable

it's UL1741 , for the US gridtie certification , and cost run about =
50-75K between fees , documentation , paying for UL to witness the =
testing , ect.

A company from The Netherlands, NFK  , was producing the "OK4U" , which =
for a short time in the US was marketed by Trace Engineering (1998-99) , =
but the unit was never certified by ANY major listing either in the US =
or UK.

I just checked and it would seem NKF no longer makes the unit and the =
OK5U would seem is another vaporware product. There really isn't any =
market for inverters in this power range ... gridtie at 100 watts would =
be maybe .5kWh day or 182.5 kWh/year .. which at 10 cents kWr would be =
18 bucks in electricity / year for a 250 dollar inverter (uncertified) , =
except for a few hobbyists it doesn't make for a profitable market to =
sell  to.




<William P.N. Smith> wrote in message =

------=_NextPart_000_0096_01C43B90.3C278990
Content-Type: text/html;
    charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; =
charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1400" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY>
<DIV><FONT face=Arial>it's UL1741 , for the US gridtie certification , and cost
run about 50-75K between fees , documentation , paying for UL to witness =
the
testing , ect.</FONT></DIV>

<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial>A&nbsp;company from The Netherlands, NFK&nbsp; , was
producing the "OK4U" , which for a short time in the US was marketed by =
Trace
Engineering (1998-99) , but the unit was never certified by ANY major =
listing
either in the US or UK. </FONT></DIV>

<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial>I just checked and it would seem NKF no longer makes the
unit and the OK5U would seem is another vaporware product. There really =
isn't
any market for inverters in this power range ... gridtie at 100 watts =
would be
maybe .5kWh day or 182.5 kWh/year .. which at 10 cents kWr would be 18 =
bucks in
electricity / year for a 250 dollar inverter (uncertified) , except for =
a few
hobbyists it doesn't make for a profitable market to sell&nbsp; =
to.</FONT></DIV>

<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>&lt;William P.N. Smith&gt; wrote in message
face=Arial
face=Arial size=2>...</FONT></DIV><FONT face=Arial size=2>&gt; =
Jason
size=2>no@email.address</FONT></A><FONT face=Arial size=2>&gt; wrote:<BR>&gt;
&gt;called the Trace Microsine inverter<BR>&gt; <BR>&gt; Unfortunately, =
those
weren't UL-&lt;something&gt; listed, and (except for<BR>&gt; the =
occasional eBay
listing) aren't available for sale here any more.<BR>&gt; The problem is =
that
UL-&lt;something&gt; testing and certification costs<BR>&gt; enough to =
make the
price of the inverter $000+($.50/W), so there<BR>&gt; aren't any cheap =

answers.<BR>&gt; <BR>&gt; -- <BR>&gt; William Smith<BR>&gt; ComputerSmiths
Consulting, Inc.&nbsp;&nbsp;&nbsp; </FONT><A

href="http://www.compusmiths.com"><FONT  face=Arial
size=2>www.compusmiths.com</FONT></A></BODY></HTML>

------=
Posted by ptaylor on May 17, 2004, 4:05 am
 Solar Guppy wrote:


It seems to me that gridtie'ing on a smaller scale wouldn't be worth
it,even if inverters were available.I'd tend to think that a small
solar/batt/inverter setup would be better.That way you can atleast store
some of the power in the batteries,and it will be there for you,day or
night.

I've been using a small 10W panel,and about 45AH of batts to run various
12V appliances in my bedroom (modem,cellphone charger,fans,CCFT
lights,etc) and it's been working fairly well so far for about a year
now.I even have a 300W inverter,that I actually used once when the power
went out one morning.It was enough to finish watching the news on the
TV,and to switch over to the PC (CRT monitor and all) and check my
email,and whatnot. (my modem is on the 12V system,and the cable TV and
telephone lines were still up and working.)I was grinning from ear to
ear. ;-)
Not bad for a small (micropower) PV system.I had the TV,then PC running
for about an hour total,until the power came back.I don't know what the
battery voltage dropped to,but the inverter cutout (10.8V) didn't kick in.


Posted by nicksanspam on May 17, 2004, 12:48 pm
 

I'd estimate there's a tremendous market, even with those economics,
and more with a certified $00 600-watt backwards lamp dimmer. Lots
of people think renewable energy is sexy. Think of putting all those
twirling lawn ornaments to better use :-)

Nick


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