[RE-wrenches] Flickering LED lights on and Outback Dual 7248 VFX system

[Jerry Shafer]

I have had this same thing happen with a off grid application using SMA
SI's it rooted back to programming one inverter was going to sleep and
under some loads the lights would flicker and they were over the dinning
room table and suspended from a 16 foot ceiling so it lit up the entire
room. I know this has a different inverter  system but I would look close
at the programming LED's use such a low load and the drivers take a second
to activate. Did you connect a DVOM and watch the volts better yet a scope
Jerry


On Mon, Jan 6, 2014 at 5:56 PM, Exeltech <exeltech at yahoo.com> wrote:

> There may also be a technical aspect of the dimmer that's adding to the
> flicker, depending on the type of dimmer(s) in use.
>
> Some dimmers use a device called a "silicon-controlled rectifier" .. or
> "SCR".  They allow only half of the sine wave to pass.  Half-wave power
> wasn't very noticeable when used with incandescent lamps due to the
> continued "glow" persistence of the filament.  However, LEDs react
> [essentially] immediately, and the flicker is very apparent.  Final thought
> .. compressors use the most energy during the compression stroke.  Actual
> current draw varies with each stroke of the piston.  Check not only the
> battery connections, but look to see if the loads are on the same circuits
> as the lamps.  If in fact the inverter AC output voltage IS dropping due to
> DC-side issues .. and the large AC loads happen to share the same circuit
> as the lamps .. this would make any flicker that much worse.
>
>
> Dan
>
>
> --------------------------------------------
> On Mon, 1/6/14, boB at midnitesolar.com <boB at midnitesolar.com> wrote:
>
>  Subject: Re: [RE-wrenches] Flickering LED lights on and Outback Dual 7248
> VFX system
>  To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>  Date: Monday, January 6, 2014, 6:25 PM
>
>
> Only during Big load surges ?
>
> Could it be current limiting and because LEDs are so fast on and off, you
> notice the drop in momentary voltage ?
>
> Any inverter might do that under the right conditions.
>
> Just a thought.
>
> boB
>
>
>
>
> On 1/6/2014 3:45 PM, Dan Fink wrote:
> > I consider LED flicker as very common when a fridge starts up, but NOT
> while it's running. Both dimmed and not dimmed LEDs. I see flicker more
> often on systems with smaller (or aging) battery systems of course. The
> only particular appliance I have found causing constant flicker here and
> with my clients is a particular brand of laser printer. And also a
> subwoofer on the stereo (light show!)....a different subwoofer brand solved
> that problem. Go figure, I have no idea why. Most of my inverters are by
> Magnum. I have not found much difference with LED brands or dimmer brands.
> > I can see how this could be a problem for your client, Kirpal. None of
> mine seem to mind a startup flicker, but if its constant that's a big
> problem. I wish I had an answer for you, but I hope that providing this
> information helps others. CFLs do not give me the same problem, but of
> course have their own other problems.
> >
> > Dan Fink,
> > Executive Director;
> > Otherpower
> > Buckville Energy Consulting
> > Buckville Publications LLC
> > NABCEP / IREC accredited Continuing Education Providers
> > 970.672.4342
> >
> >
> >
> >
> > On Mon, Jan 6, 2014 at 2:48 PM, Jay Peltz <jay at asis.com> wrote:
> >
> >     Dimmers are super specific to light brand/type.  You'll have to do
> the research
> >
> >     For now swapping to regular switches should work
> >
> >     Jay
> >
>
> _______________________________________________
> List sponsored by Home Power magazine
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive:
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out participant bios:
> www.members.re-wrenches.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20140106/b34c3069/attachment-0003.html>