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<p>I remember doing some measurements on a long wire run, and being
surprised that the actual voltage drop was much less than the
calculations. That's when I found a small note at the bottom of
the NEC Table 8 conductor properties used for official VD
calculations. The resistance is listed at 167 F (75C), so if you
use the adjustment equation in Note 2, it is much less VD, and
corresponds to reality. For underground conductors, I might use
25C. Use common sense. </p>
<p>The formula is R2=R1 (1+ a(T2-75))</p>
<p>I made a spread sheet about 15 years ago, that uses that formula
for doing wire sizing. Happy to share, if anyone is interested.</p>
<p>Ray Walters<br>
Remote Solar</p>
<div class="moz-cite-prefix">On 3/21/2026 3:21 PM, Jay via
RE-wrenches wrote:<br>
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<div dir="ltr">Are you trying to run the whole house or just the
burner? </div>
<div dir="ltr">I’m also curious about how you calculated the VD. I
ran it on a few programs and it came up much less VD. I’d go
direct or try the load and measure the VD. It won’t use the full
power for long. Or at least when I use my induction top it takes
so short to bring anything to a boil, after that it’s turned
down. </div>
<div dir="ltr">Lots of options. </div>
<div dir="ltr"><br>
<blockquote type="cite">On Mar 20, 2026, at 11:23 PM, William
Miller via RE-wrenches
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a> wrote:<br>
<br>
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<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">Friends:</span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">A
long-time client has an ADU 755 conduit feet from the
main house. They started off-grid but they are now grid
connected.</span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">In
1999 we pulled a 120 volt feeder of #1 aluminum to the
ADU. This provides about 10 amps at 5% voltage drop.</span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">This
client wants to abandon a propane cook-top in the ADU in
favor of an induction cook-top (indoor air pollution as
a consideration). A sample two burner induction
cook-top is 1800 watts--too much power draw for this
feeder. </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">I
was wondering if a portable power station rated at
enough power to run the induction cook-top might solve
this problem. The 10 amp power feed can charge the
power station at (hopefully) an acceptable amperage over
an extended time period and the power station can
provide enough surge power to run the cook-top
intermittently.</span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">I
see the Bluetti AC500, for example, can be adjusted to
draw no more than 10 amps when plugged into AC.
Unfortunately this charge rate, when running at the full
10 amps, allows little overhead for other loads. I
presume this 10 amps draw is only 10 amps when the
internal battery is fully discharged. Maybe other units
can charge at a lower rate.</span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">Have
any of you tried this? Any input is appreciated.</span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif"">William</span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal">William Miller</p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif"">Miller
Solar</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif""><a
href="http://www.millersolar.com/"
moz-do-not-send="true">www.millersolar.com</a></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif"">CA
License C-10 77398</span></p>
<p class="MsoNormal"> </p>
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