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<DIV><FONT color=#008000 size=4>Ah the good ol' days----</FONT></DIV>
<DIV><FONT color=#008000 size=4>A note from experience..... If the meter reader/
smart meter? sees backfeed, the utility is likely to ask questions. In my
customers case, the Co-op was so eager to prove to the Va. SCC that they were on
top of net metering ( this was the early days of net meter )--or maybe they just
wanted experience with it, they actually sent the Coop engineer and a lineman to
the job to test shut off with the grid off. This was with a Trace 6048 Power
Panel., vintage 1999. The lineman even put on gloves and face shield before
we removed the covers so he could verify no juice to the grid when we
turned off the main breaker. Of course nothing happened , except the house power
stayed on, as the Trace equipment was designed to sell back, but did not meet
the new UL 1741 anti-islanding standard.</FONT></DIV>
<DIV><FONT color=#008000 size=4>The engineer and the lineman were duly
impressed~!</FONT></DIV>
<DIV><FONT color=#008000 size=4>And the <STRONG>engineer</STRONG> approved
the system for net meter ~!!</FONT></DIV>
<DIV><FONT color=#008000 size=4></FONT> </DIV>
<DIV><FONT color=#008000 size=4>One more thing-- check that the utility meter
installed records the sell correctly--that is, doesn't count the backfeed as
consumption. Around here the <STRONG>new</STRONG> meters -- with remote reading
capability--don't differentiate as to direction--unless you sign up for net
meter in which case you get the proper meter.</FONT></DIV>
<DIV><FONT color=#008000 size=4></FONT> </DIV>
<DIV><FONT color=#008000 size=4>We updated several Y2K systems to new UL
certified inverters when the flooded batteries had seen better
days.</FONT></DIV>
<DIV><FONT color=#008000 size=4>Sure don't miss all that watering/ equalizing/
and acid mist.</FONT></DIV>
<DIV><FONT color=#008000 size=4>Just a few AGM's now--and an enlarged
array.</FONT></DIV>
<DIV><FONT color=#008000 size=4>Anyone need a 6048 Power Panel ?? off list
please</FONT></DIV>
<DIV><FONT color=#008000 size=4></FONT> </DIV>
<DIV><FONT color=#008000 size=4>Ken Schaal</FONT></DIV>
<DIV><FONT color=#008000 size=4>CommonWealth Solar</FONT></DIV>
<DIV><FONT color=#008000 size=4>Ashland, Va. 23005</FONT></DIV>
<DIV><FONT color=#008000 size=4>804-216-5371</FONT></DIV>
<DIV><FONT color=#008000 size=4></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #008000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=ray@solarray.com href="mailto:ray@solarray.com">Ray Walters</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, December 15, 2014 11:03
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] RE;SW4024's
were off grid, now on grid AC2 Controls?</DIV>
<DIV><BR></DIV>
<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></DIV>
<BLOCKQUOTE cite=mid:000001d01879$3e6329e0$bb297da0$@com type="cite">
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<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
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<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"> 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-FAMILY: Consolas; FONT-SIZE: 10.5pt">Best,<O:P></O:P></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: Consolas; FONT-SIZE: 10.5pt">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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style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">
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Roman','serif'; FONT-SIZE: 12pt">No virus found in this
message.<BR>Checked by AVG - <A href="http://www.avg.com"
moz-do-not-send="true">www.avg.com</A><BR>Version: 2012.0.2249 / Virus
Database: 4235/8239 - Release Date: 12/15/14<O:P></O:P></SPAN></P></DIV><BR>
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