I have had this issue with hanging LED's and it was in the inverter programming, I only had 2 SI installed. I can't recall what the program issue was but it was easy to see Jerry On Feb 12, 2014 8:14 AM, "Exeltech" <exelt...@yahoo.com> wrote:
> Troy, > > Elsewhere in this thread, boB (Midnite) suggested connecting one of the > problematic lights and dimmers directly at the inverter output. > > This is a very sound recommendation, and would immediately rule in .. or > rule out the conductors (and related circuits) as an issue. > > Another Wrench suggested using an oscilloscope to check the waveform at > the load end. This too is excellent advice, and would be even more telling > than connecting the lamps and dimmer directly at the inverter. The 'scope > will reveal the AC voltage AND a visual indication of any waveform > distortion, either aspect of which could potentially cause the flicker you > describe. > > If you don't have access to a 'scope, boB's comment about connecting at > the inverter won't require any test equipment. > > At a minimum, set your DVM to record the voltage minimum; connect it the > lamp circuit, and turn on the 1 kW load you described. If the voltage is > dropping notably, this too would introduce visible flicker. The DVM method > is less accurate than an oscilloscope, but better than nothing, and depends > greatly on the quality (or not) of your DVM. > > The above aside, anything else would be strictly conjecture .. which we > can do all day, and never be correct. > > > Dan > > > > -------------------------------------------- > On Wed, 2/12/14, August Goers <aug...@luminalt.com> wrote: > > Subject: Re: [RE-wrenches] Long transmission line inductance and LED > light flicker > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Wednesday, February 12, 2014, 9:01 AM > > Hi Troy, > > Have you double checked that your grounding systems both in the house and > at the inverters/array are all up to snuff? > > Sorry I can't offer any help with the inductance issue. > > Best, > > August > > > > From: re-wrenches-boun...@lists.re-wrenches.org [mailto: > re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Troy Harvey > Sent: Tuesday, February 11, 2014 5:45 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Long transmission line inductance and LED light > flicker > > > Richard, > > > The system configuration is: > Approx 24.7kW of modules connected to: > 2 x 9kW Sunnyboys > 1 x 5kW Sunnyboys > > Plus > 4 x 6kW sunnyislands, with 2 Parallel 48V Strings of (12 x 4V Surrettes ) > using 350MCM cable > > > > Wire > > The wire is about 1000 feet long 350 MCM in a "twisted" bundle to this > outbuilding > > Conditions > > The conditions were during the day with full sun, so during the test there > is approx. 47kW of available inverter pointed at only >15 amps (120V) of > load(!). > > The steady state conditions was a few LED lights, maybe 60 watts worth, > plus a handful of vampire loads, maybe 100-200 watts total. When a pure > resistance load, like a 1000W curling iron was turned on the lights would > flicker. > > Since the lights flickered from a resistive load, but didn't stay dim, I > assumed it was from a reactive-phase issues due to the transient turn-on - > screwing with the LED dimmer circuits which are already doing a bit of > magic to turn TRIAC waveforms into a DC constant current. > > thanks, > > Troy Harvey > --------------------- > Principal Engineer > Heliocentric > 801-453-9434 > tahar...@heliocentric.org > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@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 > >
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