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Good point, Darryl. The resting DC volts were only at 51.6 according to
the Magnum meter, kind of on the low side. I was not able to measure
any sag on the DC side because there wuz only one of me and I ain't
Plastic Man. I bet that the inverter you measued the 60 Hz on the DC
side was an SW, right? They all have an odd ability to loosen the DC
inverter cables over time because of this harmonic vibe, especially the
Al lugs they used to use back in the day. I had several problems with
tripping (no, not that kind) breakers before I changes to better cable
lugs.<br>
<br>
Matt<br>
<br>
<br>
Darryl Thayer wrote:
<blockquote cite="mid48302.36867.qm@web51908.mail.re2.yahoo.com"
type="cite">
<pre wrap="">Don't know if this will help, but an experiance of mine on starting a large motor, using a battery and inverter. The motor would not start, or if it did if would quit in 10, or 20 min. The battery had capacity to run the motor for 5 or 6 hrs to 50% DoD yet the inverter would kick out. I had reason to beleive the output wave form was bad also. I solved the problem by greatly increasing the battery size and the cables. I did not change the inverter at all.
What I think was happening is the high current draw of the inverter to serve the load reduced the battery voltage, but not just the average battery voltage but the 60 cycle peak voltage drop/ of the battery. The load of the inverter on the battery is like pulses, my amp clamp shows an AC current on the battery leads. If I had a scope, I would guess the inverter is seeing a fluxuating voltage on the battery. My grandson has a 1 Farad Capacitor in his sterio system, perhaps this would fix the problem. BoB what do you think?
Darryl
--- On Sat, 8/1/09, boB Gudgel <a class="moz-txt-link-rfc2396E" href="mailto:boB@midnitesolar.com"><boB@midnitesolar.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">From: boB Gudgel <a class="moz-txt-link-rfc2396E" href="mailto:boB@midnitesolar.com"><boB@midnitesolar.com></a>
Subject: Re: [RE-wrenches] Magnum inverters (not really a power factor issue)
To: "RE-wrenches" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
Date: Saturday, August 1, 2009, 6:22 PM
Larry Crutcher, Starlight Solar
wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hey Matt,
I sure wish their techie's would get to the bottom of
</pre>
</blockquote>
<pre wrap="">it. I am getting gun-shy about selling Magnum and they are
about the best available for small 12 volt systems. I have
spend hours trying to solve the problem. My customer is
still not a happy camper.
</pre>
<blockquote type="cite">
<pre wrap="">Larry Crutcher
Starlight Solar
(928) 941-1660
Renewable Energy Products, Service and Installation
</pre>
</blockquote>
<pre wrap="">Can you get someone to look at the voltage and/or current
going into that pump ?? Scope
? Meter ? Even a
power factor meter would have both voltage and current
measurements. Some even have a mediocre scope built
in.
A scope AND a meter is best of course.
Need stats. AC an DC side. AC voltage at
the pump and at the inverter.
Must have more information. Yes, it ~could~ be
a Magnum inverter issue, but need more information other
than "it doesn't work"
Does the voltage dip when the pump tries to start ?
What is the maximum Ac and DC current ? Most basic
info for troubleshooting.
The inverter manufacturer can probably help somewhat if
they have this info.
Just a suggestion here.
boB
</pre>
<blockquote type="cite">
<pre wrap="">
On Aug 1, 2009, at 4:28 PM, Matt Tritt wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I took boB's advice and talked to Magnum about the
</pre>
</blockquote>
</blockquote>
<pre wrap="">problem. Their take on it? "Hmmm, beats me!" I might be
paraphrasing, but that's the drift. All in all, I'd say that
the suggestions from the group are at least as good as the
one's from the manufacturer.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">Matt T
Larry Crutcher, Starlight Solar wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Don't forget, this is a Magnum inverter and
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">Magnum has issues. I have two customers with Magnum
problems. One is a washer that will work perfectly on
a cheap import inverter; the other has a Vizio TV that
works fine on shore power and generator. Soooo...maybe there
are pumps and other items that are anti-Magnum.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">
Larry Crutcher
Starlight Solar
(928) 941-1660
Renewable Energy Products, Service and
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="">Installation
</pre>
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