system output honesty [RE-wrenches]

[Jeff Clearwater]

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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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