<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Wes and everyone else.<div class=""><br class=""></div><div class="">I\u2019ve heard from Enphase and Fronius offsite and indeed its quite possible to do \u201cself consumption\u201d. Both Enphase and Fronius need some additional hardware but thats to be expected and pretty minor really.</div><div class="">SMA and SE both are supposed to do it but I didn\u2019t pursue exactly what they need to do it, but I\u2019m presuming they also need additional hardware to read the main. At this point nobody is reading the smart meter, but that would be the easiest and most accurate. Maybe when sunspec comes out it will be able to interface?</div><div class=""><br class=""></div><div class="">This whole question started from an old client up in SE alaska, who\u2019s utility no longer accepts NEM. He\u2019s got a lot of sun during the summer and not much in the winter as well as lots of clouds, which to me means that a battery system isn\u2019t going to do much. </div><div class="">And given how inexpensive GTWOB is, vs adding batteries its an interesting option. In his case I think the self consumption option is a good one. </div><div class=""><br class=""></div><div class="">In other areas with different price structures it might be totally different. And I\u2019m sure will have an impact as to what size system might be the most economic. The Fronius has a relay option that will turn loads on/off based on curtailment. </div><div class=""><br class=""></div><div class="">As to load peaks, those of us off grid folks understand to do it when the sun shines and to me I think we will see more and more smart day time load use as we see more and more renewables come on line during the daytime.</div><div class=""><br class=""></div><div class="">Thanks again everyone,</div><div class=""><br class=""></div><div class="">jay</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Aug 29, 2019, at 11:07 AM, wes kennedy <<a href="mailto:hathasolar@yahoo.com" class="">hathasolar@yahoo.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div class="ydp226abe81yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div class=""><div dir="ltr" data-setdir="false" class="">HI Jay,</div><div dir="ltr" data-setdir="false" class=""><br class=""></div><div dir="ltr" data-setdir="false" class="">The Fronius line, primo or symo have that capability. You need the smart meter to measure current flow at point of interconnection. </div><div dir="ltr" data-setdir="false" class="">The tricky bit is what happens when a big load suddenly turns off. There will always be a small flow of energy across the meter for a second or two while the system reacts and curtails the pv array. </div><div dir="ltr" data-setdir="false" class="">HECO was fine with this limited, momentary export of energy.</div><div dir="ltr" data-setdir="false" class="">These residential systems typically have very low performance factors, as the PV peaks around noon, when a typical load profile peaks morning and evening. So you end up curtailing most of your pv production. </div><div dir="ltr" data-setdir="false" class="">In a commercial application though, zero export can work really well, if you size PV to midday loads. </div><div class=""><br class=""></div><div class="ydp226abe81signature">-Wes Kennedy</div></div>
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