City of Palo Alto Utility (CPAU) in the Bay Area in CA does not install a new meter when PV systems are added to a house. Quote from section 8 of the 2010 <a href="http://www.cityofpaloalto.org/civica/filebank/blobdload.asp?BlobID=14980">CPAU PV Partners Handbook</a>: <div>
<br></div><div><font class="Apple-style-span" color="#3333ff">8.1 Electric Meter </font></div><div><font class="Apple-style-span" color="#3333ff">CPAU does not customarily change the billing electric meter when the customer installs PV, since the </font></div>
<div><font class="Apple-style-span" color="#3333ff">existing analog meter spins forwards and backwards. For metering questions contact the Electric Meter </font></div><div><font class="Apple-style-span" color="#3333ff">Shop at (650) 496-6978.</font></div>
<div><br></div><div><br><br><div class="gmail_quote">On Fri, Aug 12, 2011 at 8:14 AM, Dave Click <span dir="ltr"><<a href="mailto:daveclick@fsec.ucf.edu">daveclick@fsec.ucf.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
I just asked a guy I know in utility metering, and he confirms that there's no basis for the utility's concern. Their claim that backfeeding is a safety hazard could be an attempt to dissuade some non-PV folks from flipping their meters to steal power. Or that could be their justification to charge the customer for the new electronic meter (some utilities do this, apparently).<br>
<br>
As an anti-theft precaution, some mechanical meters don't actually spin backwards- so whether you're importing or exporting a 1kW, after an hour your counter has ticked up by one. So just because it's a mechanical meter doesn't mean that you should necessary leave it running until the utility installs that bidirectional electronic meter.<div class="im">
<br>
<br>
On 2011/8/12 9:45, Kirk Herander wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
Hello,<br>
<br>
I am now in a debate with the metering dept. of a local utility. They<br>
don’t want a PV system to be energized and tested until a bidirectional<br>
electronic meter is installed. They insist that an old plain Jane<br>
mechanical meter can be damaged and is a safety concern if power is<br>
pushed through it (its running backwards) to the grid. I have never<br>
heard of, witnessed, or been told this by any utility or AHJ inspector<br>
until now. Have any of you ever?<br>
<br>
I don’t know the reason for their paranoia. I assume that many utility<br>
districts don’t to this day install bidirectional electronic meters. And<br>
rely on the original mechanical meter to count backwards reliably and<br>
safely.<br>
<br>
Kirk Herander<br>
<br>
VT Solar, LLC<br>
<br>
dba Vermont Solar Engineering<br>
<br></div>
NABCEP^TM Certified installer Charter Member<div class="im"><br>
<br>
NYSERDA-eligible Installer<br>
<br>
VT RE Incentive Program Partner<br>
<br>
<br>
<br></div><div class="im">
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