<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Ray has it right but if he DOES try to sell back, make sure is electric meter is the old disc type. and not de-tented. You can tell if it is de-tented by observing it spin backwards on a sunny day. A de-tented meter will spin back just one revolution then a pawl releases and it spins back to where it started. Tell him NOT to try to sell into digital meter. He is likely to get charged for his consumption AND his production.<div><br><div><div>On Dec 15, 2014, at 8:03 AM, Ray Walters wrote:</div><br class="Apple-interchange-newline">
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<div class="moz-cite-prefix">What you want is already programmed
into the inverter. It's called Low Battery Transfer mode (LBX),
its just a program setting on the inverter. You select this mode
in Menu 9, and then its actual battery voltage settings are in
Menu 16.<br>
It will not sell back in this mode, but fromHome Power Magazine's
Guerrilla Solar movement of the 90s, all you have to do to sell
back: "Don't ask, Don't Tell, just press Sell".<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 12/15/2014 8:09 AM, Daniel Young wrote:<br>
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<div class="WordSection1"><p class="MsoNormal"><span style="color:#1F497D">The way I would
do this if using outback (really what I’m familiar with) is
to set up the aux relay on the inverter to trigger an AC
relay that connected the grid to the inverters ac input
using the “load shed” function. It would trigger the relay
when the batteries reached a set voltage (user programmable
in the outback), then disconnect the grid at higher set
voltage. Ex: activate relay at 46V, then de-activate relay
at 50V (48V system). All you are basically doing is
activating a charging source instead of severing a load to
help the battery state of charge. Not sure how the trace
handles AC1 and AC2, so maybe you’d need a second relay to
make sure the generator input is always off when the grid
input is active.<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="color:#1F497D">Not sure if the
trace has this functionality. Hope this applies, or helps
get you down the right path.<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div><p class="MsoNormal"><span style="color:#1F497D">With Regards,<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="color:#1F497D">Daniel Young,
<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D">NABCEP
Certified PV Installation Professional<sup>TM</sup>: Cert
#031508-90<o:p></o:p></span></p><p class="MsoNormal"><span style="color:#1F497D">NABCEP
Certified Solar Heating Installer<sup>TM</sup>: Cert
#SH031409-13<o:p></o:p></span></p>
</div>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
RE-wrenches
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>Dave<br>
<b>Sent:</b> Sunday, December 14, 2014 8:10 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> [RE-wrenches] RE; SW4024's were off
grid, now on grid AC2 Controls?<o:p></o:p></span></p>
</div>
</div><p class="MsoNormal"><o:p> </o:p></p><p class="MsoPlainText">Here is a request for advice from one of
my old off grid customers who has recently brought in the grid
to lessen his dependence on the generator. He is NOT selling
back to the grid.<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">The main question I have is this: Can we
program the Trace SW4024 so that that it will charge the
batteries with Grid Power (AC2) when a low voltage setting is
reached?<o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><< "<i>I have two SW4024
inverters. They are set up to each handle about 1/2 of the
loads in the house.<o:p></o:p></i></p><p class="MsoPlainText"><i><o:p> </o:p></i></p><p class="MsoPlainText"><i>Our system is setup so we are either
on Grid power, or battery power. <o:p></o:p></i></p><p class="MsoPlainText"><i>The choice is controlled by a manual
transfer switch.<o:p></o:p></i></p><p class="MsoPlainText"><i><o:p> </o:p></i></p><p class="MsoPlainText"><i>AC1 on both inverters is backup
generator which is controlled by Inverter #1 when battery
voltage reaches preset levels.<o:p></o:p></i></p><p class="MsoPlainText"><i><o:p> </o:p></i></p><p class="MsoPlainText"><i>AC2 on both inverters is AC from the
grid and is currently controlled by circuit breakers. The
circuit breakers are normally in the off position and the
batteries are charged by the sun. Typically if we want to
charge the batteries a bit with grid power we turn on the
circuit breakers and the batteries are charged through both
inverters by utility power.<o:p></o:p></i></p><p class="MsoPlainText"><i><o:p> </o:p></i></p><p class="MsoPlainText"><i>What I would like to be able to do is
set the inverter, probably inverter #1 for consistency, to
allow grid charging at a set battery voltage and then cut
off the grid when it reaches an upper voltage. My thought
is something along the lines of, if the batteries reach 40%
of full charge Grid is started and allowed to charge
batteries until they reach 80% charge.<o:p></o:p></i></p><p class="MsoPlainText"><i><o:p> </o:p></i></p><p class="MsoPlainText"><i>I would like to continue as things
are at present with the inverter triggering the back-up
generator if needed. Again my thought is at 35% of Full
charge Generator is started and is then shut off at 80% of
full charge.<o:p></o:p></i></p><p class="MsoPlainText"><i><o:p> </o:p></i></p><p class="MsoPlainText"><i>My goal is to use PV juice as much as
possible with first backup being Grid and second backup
being Generator. This should allow us to go away and
hopefully run the house on PV but have two backups if
needed"</i>. >><o:p></o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText"><o:p> </o:p></p><p class="MsoPlainText">I would appreciate advice from anyone
with experience with a system like this.<o:p></o:p></p><p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Best,<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Dave<o:p></o:p></span></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">David Palumbo <o:p></o:p></p><p class="MsoNormal">Independent Power LLC<o:p></o:p></p><p class="MsoNormal">462 Solar Way Drive<o:p></o:p></p><p class="MsoNormal">Hyde Park, VT 05655<o:p></o:p></p><p class="MsoNormal">802-888-7194<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p>
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message.<br>
Checked by AVG - <a moz-do-not-send="true" href="http://www.avg.com/">www.avg.com</a><br>
Version: 2012.0.2249 / Virus Database: 4235/8239 - Release
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