<font face="arial" size="4"><p style="margin:0;padding:0;">i think mark was asking more about ac coupling to get away from the horrible inefficiencies of battery based, grid-tied inverters.</p>
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<p style="margin:0;padding:0;">as an experiment, i have been thinking about ac coupling one (or more) of my arrays on my outback system to gain 10% over having the gvfx do the selling.</p>
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<p style="margin:0;padding:0;">stc to ptc usually costs about 20%, then losing another 10% in the inverter is a real performance hit. i advise customers about phantom loads and conservation, when actually the battery based inverter is itself the big lump under the carpet!</p>
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<p style="margin:0;padding:0;">todd</p>
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<p style="margin:0;padding:0;">On Thursday, March 1, 2012 7:07pm, "Maverick Brown [Maverick Solar]" <maverick@mavericksolar.com> said:<br /><br /></p>
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<div dir="ltr" align="left"><span class="783080203-02032012"><span style="color: #0000ff; font-family: Arial; font-size: 10pt;">My two cents:</span></span></div>
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<div dir="ltr" align="left"><span class="783080203-02032012"><span style="font-size: 10pt;">"battery-based inverter w/ PV on the DC side via charge controllers"</span></span></div>
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<div dir="ltr" align="left"><span class="783080203-02032012"><span style="font-size: 10pt;">Simply replace the GT inverter with a Xantrex 600V Charge Controller plus the 48V Grid Interactive Inverter of your choice and added battery bank, etc.</span></span></div>
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<div dir="ltr" align="left"><span class="783080203-02032012"><span style="font-size: 10pt;">Until the market is saturated with unneeded GT Inverters, you will be ok. ;-)</span></span></div>
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<div dir="ltr" align="left"><span class="783080203-02032012"><span style="font-size: 10pt;">Try your best to provide enough battery for at least 24 hours of outage at 50% DOD. You may have add a Sub-Panel or <span style="text-decoration: underline;">Manual</span> Transfer Switch.</span></span></div>
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<div dir="ltr" align="left"><span class="783080203-02032012"> </span><span class="783080203-02032012"><span style="font-size: 10pt;">Thanks</span></span></div>
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<div dir="ltr" align="left"><span class="783080203-02032012"><span style="font-size: 10pt;">Maverick</span></span></div>
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<div align="left"><span style="font-size: 10pt;"><span style="font-family: Arial;"><span style="color: #000000;">Maverick Brown<br /><span class="500244616-20112009"><span style="font-size: 8pt;"><span class="500244616-20112009"><span style="font-size: 8pt;">BSEET, NABCEP Certified Solar PV Installer ®<span class="375322419-03032011"> # 091209-26</span></span></span></span></span></span></span></span></div>
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<div><span style="font-family: Arial;"><span style="color: #000000; font-size: 10pt;"><strong>Maverick Solar<span class="093292723-19082008"> Enterprises, Inc.</span><br /></strong></span><span style="color: #000080; font-size: 8pt;">Billing: <span class="242455017-13122011"> </span>PO BOX 1229, Dripping Springs, TX 78620</span></span></div>
<div><span style="font-size: 8pt;"><span style="font-family: Arial;"><span style="color: #000080;"><span class="125113900-26102008">Office: 512-919-4493<br /><span class="125113900-26102008">Fax: 512-607-6398<br /></span></span>Cell: 512-460-9825<br /></span></span></span><span class="359281006-08082008"><span style="color: #000080; font-family: Arial; font-size: 8pt;">Corporate: </span><a title="http://www.mavericksolarenterprises.com/" href="http://www.mavericksolarenterprises.com/"><span style="color: #000080; font-family: Arial; font-size: 8pt;" title="http://www.mavericksolarenterprises.com/">http://www.mavericksolarenterprises.com</span></a></span></div>
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<span style="font-family: Tahoma; font-size: 10pt;"><strong>From:</strong> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <strong>On Behalf Of </strong>toddcory@finestplanet.com<br /><strong>Sent:</strong> Thursday, March 01, 2012 5:46 PM<br /><strong>To:</strong> RE-wrenches<br /><strong>Cc:</strong> 'RE-wrenches'<br /><strong>Subject:</strong> Re: [RE-wrenches] Grid-Tied, PV by AC or DC<br /></span></div>
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<p style="margin:0;padding:0;margin: 0px; padding: 0px;">excellent question mark... and one which has been on my mind as well, being most of my work is bbgt.</p>
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<p style="margin:0;padding:0;margin: 0px; padding: 0px;">todd</p>
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<p style="margin:0;padding:0;margin: 0px; padding: 0px;">On Thursday, March 1, 2012 11:37am, "Mark Frye" <markf@berkeleysolar.com> said:<br /><br /></p>
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<p style="margin:0;padding:0;margin: 0px; padding: 0px;"><span style="font-family: Arial; font-size: 10pt;">Folks,</span></p>
<p style="margin:0;padding:0;margin: 0px; padding: 0px;"><span style="font-family: Arial; font-size: 10pt;">I have a residential grid-tied customer in a net metered utility with a favorable TOU rate.</span></p>
<p style="margin:0;padding:0;margin: 0px; padding: 0px;"><span style="font-family: Arial; font-size: 10pt;">They could use about 10 kW of PV to offset 100% of their usage.</span></p>
<p style="margin:0;padding:0;margin: 0px; padding: 0px;"><span style="font-family: Arial; font-size: 10pt;">But, they also complain about regular power outages in their neigborhood. They don't want a generator.</span></p>
<p style="margin:0;padding:0;margin: 0px; padding: 0px;"><span style="font-family: Arial; font-size: 10pt;">With reliable AC coupling now available, do we yet know which is the more advantagous architecture; grid-tied, battery-based inverter w/ PV on the DC side via charge controllers, or grid-tied, battery-based inverter w/ PV AC coupled via grid-tied, utility-based inverter?</span></p>
<p style="margin:0;padding:0;margin: 0px; padding: 0px;"><span style="font-family: Arial; font-size: 10pt;">Your thoughts?</span> <br /><br /><span style="font-family: Arial; font-size: 10pt;">Mark Frye</span> <br /><span style="font-family: Arial; font-size: 10pt;">Berkeley Solar Electric Systems</span> <br /><span style="font-family: Arial; font-size: 10pt;">303 Redbud Way</span> <br /><span style="font-family: Arial; font-size: 10pt;">Nevada City, CA 95959</span> <br /><span style="font-family: Arial; font-size: 10pt;">(530) 401-8024</span> <br /><a href="http://www.berkeleysolar.com"><span style="text-decoration: underline;"><span style="font-family: Arial; color: #0000ff; font-size: 10pt;">www.berkeleysolar.com</span></span></a><span style="font-family: Arial; font-size: 10pt;"> </span></p>
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