<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I thought (based a previous thread) that we needed to be concerned with VA output of inverters, not wattage, at least on the transformer based machines like the SW.<div>I realize this wouldn't be an actual load if on grid.</div><div>In these situations, I just measure DC amps into the inverter to determine the actual consumption, irregardless of power factor, AC efficiency, etc.<div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>R. Walters</div><div><a href="mailto:ray@solarray.com">ray@solarray.com</a></div><div>Solar Engineer</div><div><br class="khtml-block-placeholder"></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span>
</div>
<br><div><div>On Jul 25, 2011, at 9:29 AM, Exeltech wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><table cellspacing="0" cellpadding="0" border="0" style="position: static; z-index: auto; "><tbody><tr><td valign="top" style="font: inherit;">Measuring current without the phase relationship between the current and voltage<br>isn't indicative of the actual power consumed. Likely what you were seeing is the<br>eddy current in the transformer core. If so, it's 90 degrees out of phase with the<br>voltage, and the real wattage consumed with no load connected is minimal.<br><br>Dan<br>Sr. Engineer<br>Exeltech<br><br><br>--- On <b>Mon, 7/25/11, Mark Frye <i><<a href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>></i></b> wrote:<br><blockquote style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(16, 16, 255); margin-left: 5px; padding-left: 5px; position: static; z-index: auto; "><br>From</blockquote></td></tr></tbody></table></blockquote></div></div></div></body></html>