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<p dir="ltr">Hello Nick,</p>
<p dir="ltr">I know I have asked you this in the past...<br>
But your calculations are so detailed that it is very <br>
Helpful to understand how you arrived at these numbers?</p>
<p dir="ltr">I am interested in starting out my PV system with just enough panels to power my new energy efficient whirlpool hot water tank. Then making any recommended additions to get the hot water tank "off grid"/zero energy or close to it as much as possible.<br>
</p>
<p dir="ltr">Thank you in advance,<br>
Bob Jakaitis<br>
Aka " Jake at the Lake"</p>
<div class="quote">On Apr 23, 2016 2:16 AM, Nick Pyner <npyner@ihug.com.au> wrote:<br type="attribution">
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<p>I am in the process of installing 3kW of PV which will inter alia be connected to a fairly new electric storage heater. I can hardly claim it to be my own idea, but it is my own money. The heater takes 4.6kWh/day of electricity @ about 10c/kWh off the
grid, which is about 65% of the total demand, the rest coming from a grey water heat exchanger.<br>
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<div class="x_moz-cite-prefix">On 23/04/2016 1:51 PM, Antonioli Dan wrote:<br>
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<div>So where are the numbers?</div>
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<div>Are you willing to invest in your own ideas, spend your own money? Report back?</div>
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<div>On Apr 22, 2016, at 8:45 PM, Nick Pyner <<a href="mailto:npyner@ihug.com.au"></a><a class="x_moz-txt-link-abbreviated" href="mailto:npyner@ihug.com.au">npyner@ihug.com.au</a>> wrote:</div>
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<p>Ah, now that IS interesting. Because the NSW certification rated heatpump highly, I assumed the testing was all done. I'm sure this is true from a simple energy standpoint, a COP is a COP, but that is all the energy certification is interested in, and it
doesn't reflect the bigger picture. The controversy I alluded to has been brewing for some time and it all hit the fan with with the release of a Regulatory Impact Statement in 2013.</p>
<p><a class="x_moz-txt-link-freetext" href="http://www.energyrating.gov.au/document/consultation-regulation-impact-statement-heat-pump-water-heaters">http://www.energyrating.gov.au/document/consultation-regulation-impact-statement-heat-pump-water-heaters</a></p>
<p>and background</p>
<p><a class="x_moz-txt-link-freetext" href="http://yourenergysavings.gov.au/energy/hot-water/heat-pump-hot-water">http://yourenergysavings.gov.au/energy/hot-water/heat-pump-hot-water</a></p>
<p>The certification work I do is a minimum standard. I have never needed to call for heat pump. If PV goes in, a plain-vanilla storage heater more than suffices. I was looking into heat pumps on a job but I found the manufacturer excluded alpine areas over
1000m, and there's me, you guessed it, working on a ski lodge at 1700m. I subsequently found that Rheem make no such distinction and claim(ed) their included resistance heater was unique. Not true, Bosch have one too.</p>
<p>I can't see why you would ever programme a heat pump to use electric only. It is only there for backup and should not require human intervention.<br>
</p>
<p>The game seems pretty shambolic.</p>
<p>Nick Pyner</p>
<p>Dee Why Beach NSW<br>
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<p>On 23/04/2016 1:34 AM, Antonioli Dan wrote:<br>
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<div> I’m looking into hybrid models that allow you to program the tanks to run on heat-pump only, electric only, and both. </div>
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<div>But with heat pumps now all the rage what I’m looking for are solid numbers, not hypothetical calculations.<br>
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<div>On Apr 21, 2016, at 9:32 PM, Nick Pyner <<a class="x_moz-txt-link-abbreviated" href="mailto:npyner@ihug.com.au"></a><a class="x_moz-txt-link-abbreviated" href="mailto:npyner@ihug.com.au">npyner@ihug.com.au</a>> wrote:</div>
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<div bgcolor="#FFFFFF">Indeed I have. I was unsure about raising them because of climate considerations, but the essential principle is the same anyway.<br>
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