This is something I have pondered a lot as the export tariff here is zero. But there is a fundamental flaw in your logic. You are asking what device would do this, that's an easy answer. Your real problem is what would you use it for. What can this electricity be used for that is worth not getting 10c per KWh for it.<div>
Answer that and the device will be easy.<br><br><div class="gmail_quote">On Mon, Oct 22, 2012 at 8:12 PM, Carl Emerson <span dir="ltr"><<a href="mailto:Carl@solarking.net.nz" target="_blank">Carl@solarking.net.nz</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Hi There,<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Since no-one has mentioned an ‘off
the shelf’ product to achieve AC diversion for a grid-tied system, I
would like to look at developing one.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">I am prepared to put my ideas into the
ring.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">This could be a collaborative effort, are there
others who would like to participate in this ?<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">If so please contact me off list…<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><font size="3" color="black" face="Arial"><span style="font-size:12.0pt;font-family:Arial">Regards<br>
Carl Emerson<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="black" face="Arial"><span style="font-size:12.0pt;font-family:Arial">Freepower Co.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="black" face="Arial"><span style="font-size:12.0pt;font-family:Arial">Auckland NZ</span></font><font size="1" color="white" face="Arial"><span style="font-size:9.0pt;font-family:Arial;color:white"><u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="1" color="white" face="Arial"><span style="font-size:9.0pt;font-family:Arial;color:white"> <u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><b><font face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma">
<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>
[mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b><span style="font-weight:bold">On Behalf Of </span></b>Carl Emerson<br>
<b><span style="font-weight:bold">Sent:</span></b> 16 October 2012 1:36 p.m.<br>
<b><span style="font-weight:bold">To:</span></b> 'RE-wrenches'<br>
<b><span style="font-weight:bold">Subject:</span></b> [RE-wrenches] FW: AC
(only) Diversion</span></font><span lang="EN-US"><u></u><u></u></span></p>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Hi there,<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Just to clarify, we are talking about a
battery-less grid tie system.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">We want to have the choice to divert the
AC available for export to an AC load for example a pump or a thermal store.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">The reason for this is that the tariff for
export may be only 10c and the unit cost to import 20c. (net-metering not
available)<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Further to this, the tariff changes
depending on the time of day.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Financially it is often a better option to
use the excess power locally on site rather than to sell back to the grid.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Is there an off the shelf unit that will
sense when the generated power exceeds the loads and can divert the power that
would have been exported to a local load?<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">I have figured out a way to do this
cheaply but need to know if I am reinventing the wheel…<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
<div>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span lang="EN-NZ" style="font-size:12.0pt;font-family:Arial;color:blue">Carl Emerson<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span lang="EN-NZ" style="font-size:12.0pt;font-family:Arial;color:blue">Free Power Co.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span lang="EN-NZ" style="font-size:12.0pt;font-family:Arial;color:blue">Land line <a href="tel:%2B64%209%20473%204286" value="+6494734286" target="_blank">+64 9 473 4286</a></span></font><font color="blue"><span lang="EN-NZ" style="color:blue"><u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span lang="EN-NZ" style="font-size:12.0pt;font-family:Arial;color:blue">Mobile <a href="tel:%2B64%2022%20630%209689" value="+64226309689" target="_blank">+64 22 630 9689</a></span></font><font color="blue"><span lang="EN-NZ" style="color:blue"><u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span lang="EN-NZ" style="font-size:12.0pt;font-family:Arial;color:blue">Email
<a href="mailto:emerson@freepower.co.nz" target="_blank">emerson@freepower.co.nz</a><u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span lang="EN-NZ" style="font-size:12.0pt;font-family:Arial;color:blue">Web
<a href="http://www.freepower.co.nz" target="_blank">www.freepower.co.nz</a><u></u><u></u></span></font></p>
</div>
<p class="MsoNormal"><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"><u></u> <u></u></span></font></p>
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</span></font></div>
<p class="MsoNormal"><b><font face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma">
<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>
[mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b><span style="font-weight:bold">On Behalf Of </span></b>Drake<br>
<b><span style="font-weight:bold">Sent:</span></b> 16 October 2012 1:04 a.m.<br>
<b><span style="font-weight:bold">To:</span></b> RE-wrenches<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [RE-wrenches] AC
(only) Diversion</span></font><span lang="EN-US"><u></u><u></u></span></p>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><u></u> <u></u></span></font></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">You could use Morning
Star relay driver to control the AC dump load. I have one for my system, but
have not yet installed it, but have programmed it on my computer. If it
works as designed, it should be perfect in conjunction with a relay. <br>
<br>
<br>
<br>
At 04:42 AM 10/14/2012, you wrote:<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" color="blue" face="Times New Roman"><span style="font-size:12.0pt;color:blue">Hi there,<br>
<br>
Is there an off the shelf low cost product that will divert exported
energy to a load?<br>
<br>
I have put thought into this and have a simple solution but need to know if it
is worth while marketing it.<br>
<br>
<br>
Carl Emerson<br>
Free Power Co.<br>
Land line <a href="tel:%2B64%209%20473%204286" value="+6494734286" target="_blank">+64 9 473 4286</a><br>
Mobile <a href="tel:%2B64%2022%20630%209689" value="+64226309689" target="_blank">+64 22 630 9689</a><br>
Email <a href="mailto:emerson@freepower.co.nz" target="_blank">emerson@freepower.co.nz</a><br>
Web <a href="http://www.freepower.co.nz/" target="_blank">www.freepower.co.nz</a><br>
<u></u><u></u></span></font></p>
<div class="MsoNormal" align="center" style="text-align:center"><font size="3" color="blue" face="Times New Roman"><span style="font-size:12.0pt;color:blue">
<hr size="2" width="100%" align="center">
</span></font></div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><font face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma">
<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank"> mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
<b><span style="font-weight:bold">On Behalf Of </span></b>Chris Mason<br>
<b><span style="font-weight:bold">Sent:</span></b> 13 October 2012 2:17 p.m.<br>
<b><span style="font-weight:bold">To:</span></b> RE-wrenches<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [RE-wrenches] AC
(only) Diversion<br>
</span></font> <br>
It is called a reverse current relay, use it to to run on a water heating
contactor when there is current to the grid.<br>
This is a problem I have struggled with for ages. We do not get credit for
export so I have been looking for a good use for free electricity, have not
found one yet.<br>
On Fri, Oct 12, 2012 at 3:36 PM, Nathan Stumpff <<a href="mailto:Nathan@arcticsun-llc.com" target="_blank">Nathan@arcticsun-llc.com</a> > wrote:<br>
Wrenches,<br>
<br>
We are working on the design for a system where we will be using grid-tied wind
and solar but will not be able to net-meter the project (we can interconnect
but the meter only runs one way.) Anything we use on site is worth 100%, any
production that goes back to the grid is lost forever to the customer. What we
would like to do is monitor all solar and wind production, monitor all usage,
and then be able to dump every watt-hour of over production as heat, there is
plenty of (thermal) storage capacity.<br>
<br>
If this were a battery based system I know how I would approach this and what
equipment I would spec, but so far I am having a hard time coming up with
a solution. Anyone have any suggestions for products or strategies in
this case? Something like an eGauge with programmable PWM relay outputs?<br>
<br>
Any thoughts or suggestions are most appreciated,<br>
-Nathan<br>
<br>
<br>
--<br>
Nathan J. Stumpff - Arctic Sun, LLC<br>
NABCEP Certified PV Installer #091209-175<br>
NABCEP Certified Solar Heating Installer #032412-14<br>
<a href="mailto:nathan@arcticsun-llc.com" target="_blank">nathan@arcticsun-llc.com</a><br>
Office: <a href="tel:907%2F457-1297" target="_blank">907/457-1297</a><u></u><u></u></p>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>Chris Mason<div>President, Comet Systems Ltd</div><div><a href="http://www.cometenergysystems.com" target="_blank">www.cometenergysystems.com</a></div><div>
Cell: 264.235.5670</div><div>Skype: netconcepts</div><br>
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