[RE-wrenches] Magnum inverters (not really a power factor issue)
Darryl Thayer
daryl_solar at yahoo.com
Sat Aug 1 20:57:53 PDT 2009
Yes Matt it was an SW
--- On Sat, 8/1/09, Matt Tritt <solarone at charter.net> wrote:
> From: Matt Tritt <solarone at charter.net>
> Subject: Re: [RE-wrenches] Magnum inverters (not really a power factor issue)
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Saturday, August 1, 2009, 10:51 PM
>
>
>
>
>
>
> 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.
>
>
>
> Matt
>
>
>
>
>
> Darryl Thayer wrote:
>
> 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 <boB at midnitesolar.com>
> wrote:
>
>
>
> From: boB Gudgel <boB at midnitesolar.com>
> Subject: Re: [RE-wrenches] Magnum inverters (not really a
> power factor issue)
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Saturday, August 1, 2009, 6:22 PM
> Larry Crutcher, Starlight Solar
> wrote:
>
>
> Hey Matt,
> I sure wish their techie's would get to the bottom of
>
>
> 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.
>
>
> Larry Crutcher
> Starlight Solar
> (928) 941-1660
> Renewable Energy Products, Service and Installation
>
>
> 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
>
>
>
>
>
>
>
>
> On Aug 1, 2009, at 4:28 PM, Matt Tritt wrote:
>
>
>
> I took boB's advice and talked to Magnum
> about the
>
>
>
> 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.
>
>
>
> Matt T
>
> Larry Crutcher, Starlight Solar wrote:
>
>
> Don't forget, this is a Magnum inverter
> and
>
>
>
>
> 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.
>
>
>
>
>
> Larry Crutcher
> Starlight Solar
> (928) 941-1660
> Renewable Energy Products, Service and
>
>
>
>
> Installation
>
>
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