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<div>We design around a 1.3 to 1.4 DC to AC ratio these days. We do see others going higher but that's generally for multi-MW ground mount systems when utility interconnection upgrade costs can make big leaps as the AC capacity gets higher. Back when an Astropower
module was 4 bucks a watt, you'd never consider it, but at today's prices you can deal with a couple percent overall efficiency drop and still have better economics.</div>
<div>I also agree that the PV Watts run is actually KWH/KWp/YR.</div>
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<div>David</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Jerry Shafer via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Monday, January 27, 2025 8:41 PM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Jerry Shafer <jerrysgarage01@gmail.com><br>
<b>Subject:</b> Re: [RE-wrenches] PV watts question</font>
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CAUTION: External Email.</div>
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<div dir="auto">Interesting topic, what l am seeing is over throttling which will potentially contribute to mid day clipping. Many inverters now can be overdriven by as much as 200% but the inverter will only produce it's rated output and 150% well that's right
in there.
<div dir="auto">But hey what do l know. Looking forward to other ideas</div>
<div dir="auto">Fun times</div>
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<div dir="ltr" class="x_gmail_attr">On Mon, Jan 27, 2025, 11:56 AM jay via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br>
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<blockquote class="x_gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
HI All<br>
<br>
I’m working with a customer who’s pretty savvy and is using PV watts for his design.
<br>
<br>
What I can’t figure out is the kwh/year goes down if he uses dc/ac ration of 1.5 instead of 1.2 which is the default.<br>
<br>
Hes in Santa Fe NM.<br>
<br>
.8 ratio= 1663 kwh/yr<br>
1.0 ratio = 1668 kwh/yr<br>
1.2 ratio = 1671 kwh/yr<br>
1.5 ratio = 1623 kwh/yr<br>
<br>
I was expecting that more PV = more kWh/yr.<br>
<br>
What am i missing?<br>
<br>
<br>
standard module<br>
fixed roof mount<br>
14.08 loss’s<br>
10 degree tilt<br>
180 degrees <br>
<br>
<br>
<br>
jay<br>
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