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Bill,<br>
A true RMS meter shouldn't be necessary with a gennie in most cases,
as the gennie is a rotating source, so the waveform is naturally
true sine, or close. The true-RMS meter is more important with
mod-square inverters, as cheap DMMs estimate RMS voltage as a
proportion to peak voltage, and a mod-square inverter won't create
the 164V waveform peak voltage necessary to read 117V by direct
conversion. <br>
<br>
There's an exception here, though, that may be in play. What's your
elevation? Drawing off of one AC output leg on that Onan will give
you at most 2000 watts, and that's reduced by (rule of thumb here)
3.5% per 1000 feet above sea level. So if you're pulling 1.7 KW on
that leg, whether or not the other house is also drawing, you may be
overloading the Onan enough to pull down the voltage waveform peak
voltage.<br>
<br>
First, yes, try measuring with a true-RMS meter, as a
process-of-elimination troubleshooting initial step. Then try
reducing the VFX3648's input current and observing how the voltage
changes. Third, add a PSX240 or equivalent to allow both gennie legs
to feed the inverter. <br>
<br>
I haven't run voltage drop calcs in making these recommendations,
but I don't think that the #10 wire is the source of the troubles.<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span style="mso-bidi-font-weight:bold">Positive
Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
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<div class="moz-cite-prefix">On 9/25/2016 11:03 PM, frenergy wrote:<br>
</div>
<blockquote cite="mid:9b40e5ce-84e7-0f0e-a05e-0963867b4f47@psln.com"
type="cite">
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Wrenches,<br>
I have a customer that is reading voltage with a
non-RMS meter in the following scenario: 4000 watt Onan RV
generator (older) at ~5500 foot elevation...its output is
connected to the "AC in leg 1" of an OB VFX3648 using (customer
installed, I came on this job after-the-fact) 10 gauge running
about 75'. Genny fires up, feeds AC IN in VFX, sends about 1.7 KW
to the batts, while also running moderate loads in house <i>another</i>
75' away, again through 10 gauge. <br>
<br>
She is complaining about the voltage reading ~95
volts at times in the house. Voltage at genny is still around 120
(I am told) I suggest up sizing wire to 6 gauge, which they do but
voltage is still in the 105 V range in the house, same scenario.
As the batts come up to charge and input tapers, voltage also
comes up some. Shouldn't the voltages be read with an RMS type
meter to be accurate? She thinks the inverter is not working
right though I've tried to explain to her that in standby the
inverter is not inverting, its just passing genny power through,
unchanged other than the load its pulling to charge the batts.<br>
<br>
Other insights to voltage drop in this case other than
an RMS meter? Does it matter if the last loads are seeing just
105 volts?<br>
<br>
Thanks,<br>
Bill<br>
<br>
<pre class="moz-signature" cols="72">--
Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.frenergy.net">www.frenergy.net</a> </pre>
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