system output honesty [RE-wrenches]

[Bill Brooks]

Jeff C.,

It is less important with a small array, but it still will work slightly
better. The much bigger issue with dual inverters in sell mode is that they
don't behave nicely with each other (they don't know how to share). One
inverter invariably wins the conversion battle and the other inverter sits
idle, or more likely, starts drawing power from the grid to fight the other
inverter.

I have yet to see a dual SW system on the grid the worked really well. You
can trick them into working with various settings. I have a set of settings
that has worked well for me, others on the list may have their own methods.
If people are interested, we can do this onlist. If not, email me and I'll
send them offlist.

Bill.



> -----Original Message-----
> From: Jeff Clearwater [mailto:clrwater at earthlink.net]
> Sent: Tuesday, September 25, 2001 12:02 PM
> To: RE-wrenches at topica.com
> Subject: RE: system output honesty [RE-wrenches]
>
>
> Hi Bill,
>
> Does this apply to 1500 Watts going into two SW5548s in Sell back?
> Or is it only important with some threshold percentage of input/rated
> wattage?
>
> Thanks for this!
>
> Jeff C.
>
>
> >The tech menu is the third level (go to menu 20, then push the
> red and green
> >buttons). Go to menu 22 (Sync) and then push the down menu arrow
> until you
> >get to "Set PWM Angle". The factory default is 129---push the down arrow
> >until it reads 126 (minimum setting). Then make sure you return
> the unit to
> >meters (or wherever you leave it) so that the owner doesn't screw up the
> >settings.
> >
> >I make no guarantees on whether or not the unit will blow up in your face
> >(just kidding), but if you try this out on a good size array (3-5 kWstc)
> >during the middle of the day, you will see a very pronounced reduction in
> >heat of the SW unit.
> >
> >The first time I did this on my unit, the inverter was producing
> 2000 Watts
> >AC but was sloshing around 3000 Volt-amps AC. The fans were running full
> >blast, the unit was burning hot to the touch which caused me to
> inquire what
> >the problem was. After finally getting hold of the SW designer and
> >describing what I was seeing on the oscilloscope, he suggested the above
> >fix. After doing this, the volt-amps dropped dramatically and the unit
> >cooled down and the fans started cycling. It would be a miracle for the
> >efficiency of the unit to be above 80% under the unadjusted condition.
> --
> ~~~~~~~~~~~~~~~~~~~
> Jeff Clearwater
> Ecovillage Design Associates
> 2525 Arapahoe Ave, Suite E4, #280
> Boulder, CO 80302
> Community and Village Scale Renewable Energy Systems
> 303-546-0460, clrwater at earthlink.net
>
> Council Member - Ecovillage Network of the Americas
> http://www.gaia.org/secretariats/ena/
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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