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<div class="moz-cite-prefix">Thank you Helmut,<br>
<br>
No immediate plans to charge the platoon of Nissan Leafs from the
one dangling light socket in the house, for 60mins !<br>
<br>
Given the obviously available methods of energy storage within a
house (hot water cylinder, electric storage heater), and the
availability of low cost nighttime electricity, it became quite
quickly obvious to me that the whole marketing ploy of
electric-kiwi was rather clever. At first brush, it seems a
brilliant deal; upon investigation it seems almost useless. Isn't
that almost the definition of brilliant marketing ?<br>
<br>
Regards, Mark<br>
<br>
On 25/06/2017 8:01 PM, Helmut Walle wrote:<br>
</div>
<blockquote type="cite"
cite="mid:8d045692-6b87-f808-aedb-a28d20389e44@gmail.com">Safety
warning...
<br>
<br>
A word of caution regarding this line of thought - and I am sure
you are more than aware of this, Mark, but it may warrant stating
explicitly: time is obviously limited. You have one hour to
"download" all the energy you can get, which appears tempting. But
there clearly is an incentive to draw a high current in this
tariff.
<br>
Now while the service fuse may be rated 60 A, surely many of the
downstream parts of the installation are not. This lies in the
nature of residential wiring work, which is there to provide
electricity to many places in the house, but the power available
per socket is quite limited. The current rating on any individual
circuit will typically be 10-20 A. All circuits should have
appropriate over-current protection. But there are some potential
issues with this: any electrical installation is subject to
ageing. One thing that happens is that connection points of any
kind show a higher resistance over time, which can be due to
corrosion or loosening. The increased resistance can lead to
excessive heating under high load (high current). One of the
possible outcomes is a fire. But even moderate heating that
doesn't cause an outright fire can damage and degrade insulation,
which can in the long run again lead to a fire.
<br>
<br>
Older houses in particular may be fraught with various issues
affecting the safety of their electrical wiring, which can be a
serious safety risk under very "normal" operating conditions that
do not even go anywhere near maxing out the current ratings.
<br>
<br>
So this is something to keep in mind: when connecting higher loads
or drawing higher currents than before from the same installation,
be particularly careful and alert regarding these safety concerns.
<br>
<br>
Kind regards,
<br>
<br>
Helmut.
<br>
<br>
On 25/06/2017 11:50 a.m., Mark Atherton wrote:
<br>
<blockquote type="cite">Hello All,
<br>
<br>
Only just found about this energy company, and their offer of 60
min of
<br>
free off-peak electricity per day -
<br>
<a class="moz-txt-link-freetext" href="https://www.electrickiwi.co.nz/hour-of-power">https://www.electrickiwi.co.nz/hour-of-power</a>
<br>
<br>
Haven't run-the-numbers yet to see if there are real savings to
be had,
<br>
but figure this might make an interesting
chocolate-fish-challenge for
<br>
the group.
<br>
<br>
So the question is: how maximize the benefit of this kind of
offer.
<br>
<br>
So for a 60A service to a house, this is almost 14kW, and at
$0.35 per
<br>
(daytime) unit, this could amount to just under $5 per day, if
the
<br>
entire 60A could be consumed. This amounts to around $150 per
month
<br>
possible savings.
<br>
<br>
Obvious thing to turn on is the heater on the hot tank (3.5kW),
which
<br>
would normally be heated at the night rate ($0.15 per unit), so
only
<br>
$0.52 savings here.
<br>
<br>
So, the problem looks like it converges on a need for daytime
power, if
<br>
the higher saving is to be leveraged.
<br>
<br>
Anyway, just a daft thought experiment.
<br>
<br>
Comments welcome.
<br>
<br>
-Mark
<br>
<br>
<br>
<br>
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