-----Original Message-----
  From: dean-@halcyon.com [mailto:dean-@halcyon.com]
  Sent: Wednesday, November 24, 1999 11:22 PM
  To: DosB-@aol.com; RE Wrenches
  Subject: Automatcic control of SW4024 [RE-wrenches]

  I have a SW4024 with 1.3KW of PV and sell to the local electric
  cooperative. My problem was if I left the inverter in sell mode, when
  the sun
  went down the inverter would consume power while continuing to maintain
  the sell voltage overnight until the sun appeared the next morning.

  Being an imbedded software engineer I knew there was a better way.

  I purchased a Z-world imbedded controller with built-in serial ports and
  analog to digital converter. The a serial port on the controller is
  connected to a Trace Comm interface. The controller reads the voltage
  off a 60-amp shunt connected to the PV supply. Using a simple
  histeresas algorithm the controller commands the inverter to "sell" mode
  after the PV current has be 5 amps or above for three minutes.
  Conversely when the PV current drops below 5 amps for six minutes the
  controller commands the inverter back to the "SLT", silent mode.

  While not an inexpensive solution, it has been working great for the
  last six months.
 

  Darren Emmons

--
Todd Cory
KE6SXS
toddcory@jps.net
Bald Mountain Solar
P.O. Box 689
Mt. Shasta, Ca. 96067
(530) 926-1079
 

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