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			<title>Green Building Forum - measuring electricity consumption on things without plugs</title>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106448#Comment_106448</link>
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		<pubDate>Mon, 28 Mar 2011 12:54:49 +0100</pubDate>
		<author>RobinB</author>
		<description>
			<![CDATA[I know where to buy a plug-in electricity meter to measure power consumption of individual appliance with a plug e.g. the fridge but is there something I can get to measure the power consumption of our MVHR which is wired in? Ideally something that could be simply moved from place to place to e.g. to assess our heat pump, immersion etc. <br />thanks<br />RobinB]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106450#Comment_106450</link>
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		<pubDate>Mon, 28 Mar 2011 13:15:13 +0100</pubDate>
		<author>DamonHD</author>
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			<![CDATA[A clip-on meter *may* be able to do a reasonable job *if* you can (safely) separate out the live and neutral wires at some point and and clip on to just one of them.  (Clipping on to a cable containing both will give a useless zero reading.)<br /><br />Rgds<br /><br />Damon]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106527#Comment_106527</link>
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		<pubDate>Tue, 29 Mar 2011 09:19:51 +0100</pubDate>
		<author>RobinB</author>
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			<![CDATA[Hmmm, thanks Damon, I *might* try this, anyone any other suggestions?<br />thanks again<br />RobinB]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106531#Comment_106531</link>
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		<pubDate>Tue, 29 Mar 2011 09:44:29 +0100</pubDate>
		<author>CWatters</author>
		<description>
			<![CDATA[You may have to break into the wiring somewhere (eg at the FSU). There is no other way to do it if you can't find somewhere where a clamp can be fitted around live or neutral only.<br /><br />Measuring low AC power isn't easy as there can be phase errors. Using one plug in meter my PC appears to draw 60W even when switched off using the switch on the back of the power supply.]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106552#Comment_106552</link>
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		<pubDate>Tue, 29 Mar 2011 13:43:42 +0100</pubDate>
		<author>RobinB</author>
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			<![CDATA[That's so inaccurate as to be worthless! I suppose manufacturers must have more accurate means. <br />Thanks for the info anyhow.<br />RobinB]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106554#Comment_106554</link>
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		<pubDate>Tue, 29 Mar 2011 13:53:20 +0100</pubDate>
		<author>DamonHD</author>
		<description>
			<![CDATA[It's not always that bad; all of my plug-in meters are fine, and the clip-on ones will do a reasonable job (+/-10% probably) unless the load has a very odd waveform / load-factor, which is possible.<br /><br />They only cost ~Â£30 down Maplin, or you can geta free one various ways, or some libraries/councils lend them out.<br /><br />Give it a whirl.<br /><br />Rgds<br /><br />Damon]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106561#Comment_106561</link>
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		<pubDate>Tue, 29 Mar 2011 16:11:24 +0100</pubDate>
		<author>SteamyTea</author>
		<description>
			<![CDATA[May be worth looking at the upper and lower bounds of the electricity supply voltage and then deciding if any readings are so way out that you need more accurate equipment.<br />Any resistance load can be checked (within a bit) with a simple multi-meter and then double checked with an clamp-on amp meter.  Inductive and capacitance is a bit more tricky, but realistically how accurate do you need to be.<br />My current logger is sensitive enough to know when an 8W CFL light goes on, and it logs every 6 seconds.  If you are trying to find out fraction of a Watt parasitic loads, such as stand by loads, try working out what the load should be and see if that is detectable rather than see if you can detect it and then work out what it is. <br />There is more than one way to skin a cat.]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106578#Comment_106578</link>
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		<pubDate>Tue, 29 Mar 2011 21:40:12 +0100</pubDate>
		<author>RobinB</author>
		<description>
			<![CDATA[Many thanks, I'm not trying to be super-accurate but 50w out would be a waste of time.  Off to Maplins or Amazon or suchlike. thanks<br />RobinB]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106640#Comment_106640</link>
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		<pubDate>Wed, 30 Mar 2011 22:46:10 +0100</pubDate>
		<author>RobinB</author>
		<description>
			<![CDATA[Damon - would it be this type of clip on thing - the kind usually for the whole house?  <a href="http://www.maplin.co.uk/efergy-elite-wireless-energy-saving-meter-225407" target="_self" rel="nofollow">http://www.maplin.co.uk/efergy-elite-wireless-energy-saving-meter-225407</a><br /><br />Also anyone brighter than me see the advantage of the 19.99 plug in meter over the 7.99 one on the same website?<br /><br />thanks<br />RobinB]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106644#Comment_106644</link>
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		<pubDate>Wed, 30 Mar 2011 23:18:59 +0100</pubDate>
		<author>wookey</author>
		<description>
			<![CDATA[If you are going to buy a plug-in meter make sure it can do small loads accurately - many can't. I know for a fact that this one can (down to 0.2W, I've got one), and it's inexpensive, and thus I recommend it: <a href="http://navitron.org.uk/product_detail.php?proID=339&catID=67" target="_self" rel="nofollow">http://navitron.org.uk/product_detail.php?proID=339&catID=67</a><br />you do have to read the answers whilst it's plugged-in though, as it has no battery so goes off when unplugged. This can involve neck-craning.]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106657#Comment_106657</link>
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		<pubDate>Thu, 31 Mar 2011 10:24:33 +0100</pubDate>
		<author>DamonHD</author>
		<description>
			<![CDATA[Take Wookey's advice.  I tested the Efergy and its granularity was 100W.<br /><br /><a href="http://www.earth.org.uk/note-on-clip-on-power-meters-for-the-UK-REVIEW.html" target="_self" rel="nofollow">http://www.earth.org.uk/note-on-clip-on-power-meters-for-the-UK-REVIEW.html</a><br /><br />Rgds<br /><br />Damon]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106662#Comment_106662</link>
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		<pubDate>Thu, 31 Mar 2011 12:00:52 +0100</pubDate>
		<author>Ben1974</author>
		<description>
			<![CDATA[If the your MHVR is wired into a FCU there is nothing to stop you changing it for for standard 13A socket and putting a plug onto the MHVR supply cable. <br /><br />The plug and socket are a perfectly acceptable means of isolation for maintenance within the wiring regulations. (and even common sense!)]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106665#Comment_106665</link>
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		<pubDate>Thu, 31 Mar 2011 12:42:40 +0100</pubDate>
		<author>jms452</author>
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			<![CDATA[With the advantage that if the plug socket was already there you probably don't need to be part P to wire a plug and plug it in!]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106697#Comment_106697</link>
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		<pubDate>Thu, 31 Mar 2011 17:51:29 +0100</pubDate>
		<author>RobinB</author>
		<description>
			<![CDATA[Thanks I'll take your advice,and  I thought granularity was for sugar.  Yes it would be TOO sensible to have provided a plug and socket. The MHVR instrutcions specifically ask for it to be hard wired in. So that is what happened. <br />Grrr!<br />RobinB<br /><br />ps, Yes, Robins can growl]]>
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		<title>measuring electricity consumption on things without plugs</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7196&amp;Focus=106882#Comment_106882</link>
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		<pubDate>Sun, 03 Apr 2011 10:21:44 +0100</pubDate>
		<author>CWatters</author>
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			<![CDATA[Its so it can't be unplugged loosing ventilation.]]>
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