Re: [RE-wrenches] Magnum inverters (not really a power factor issue)

Matt Tritt Sat, 01 Aug 2009 20:52:45 -0700

Yeah, boB - I think this sounds like a good trail to follow.


Matt

boB Gudgel wrote:

Darryl Thayer wrote:
Don't know if this will help, but an experiance of mine on starting alarge motor, using a battery and inverter. The motor would notstart, or if it did if would quit in 10, or 20 min. The battery hadcapacity to run the motor for 5 or 6 hrs to 50% DoD yet the inverterwould kick out. I had reason to beleive the output wave form was badalso. I solved the problem by greatly increasing the battery sizeand the cables. I did not change the inverter at all.What I think was happening is the high current draw of the inverterto serve the load reduced the battery voltage, but not just theaverage battery voltage but the 60 cycle peak voltage drop/ of thebattery. The load of the inverter on the battery is like pulses, myamp clamp shows an AC current on the battery leads. If I had ascope, I would guess the inverter is seeing a fluxuating voltage onthe battery. My grandson has a 1 Farad Capacitor in his steriosystem, perhaps this would fix the problem. BoB what do you think?
Darryl
Try it. Put it right across the inverter DC terminals if you do tryit. Sometimes, higher capacitance can actually make things worse,like, raising the peak
DC voltage seen at the inverter terminals due to L-C resonance.

boB
--- On Sat, 8/1/09, boB Gudgel <b...@midnitesolar.com> wrote:
From: boB Gudgel <b...@midnitesolar.com>
Subject: Re: [RE-wrenches] Magnum inverters (not really a powerfactor issue)
To: "RE-wrenches" <re-wrenches@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 themaximum 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 onshore 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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Re: [RE-wrenches] Magnum inverters (not really a power factor issue)

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