Sw efficiency [RE-wrenches]

Bill Brooks billbrooks7 at earthlink.net
Wed Sep 19 10:15:35 PDT 2001


Larry,

If these are ETL-units, it will be worth it. Please review the thread of
messages from September 4:

Todd and all wrenches with ETL-listed, grid-connected SW-series inverters,

I thought you'd never ask. Actually, this is fairly straight-forward as long
as you don't screw around with any other settings. Don't call Trace if you
screw everything up in the tech menus--just kill the voltage and start over.

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.

This ONLY applies to SELL mode operations. Off-grid units will not
experience this problem because they are not syncing to the grid.

Bill.



> -----Original Message-----
> From: Lawrence Elliott [mailto:larry at energyoutfitters.com]
> Sent: Wednesday, September 19, 2001 9:58 AM
> To: RE-wrenches at topica.com
> Subject: Sw efficiency [RE-wrenches]
>
>
> Hi All!. I got in a little late on this PWM change in the SW increasing
> efficiency. I have a system with 2 SW5548's,four RV 30's and 48 SR100's.
> It will soon be in Sell mode rather than LBX. Do you think the change in
> programming would be practical and just how do you do it?
> Thanks
> Larry Elliott
>
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