Automatcic control of SW4024 [RE-wrenches]

[Bob Ellison]

Interesting solution, What does it cost to assemble one of the controllers
and would you be willing to do some more of them?
It sounds like something Trace should be looking at.

Have a good Thanksgiving,
Bob Ellison

RE. Ellison
Alternative Energy Systems & Supplies
34642 Countryman Road
Theresa, New York. USA.
                           13691-2076


-----Original Message-----
From:	deandjh at halcyon.com [mailto:deandjh at halcyon.com]
Sent:	Wednesday, November 24, 1999 11:22 PM
To:	DosBobos at 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



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To unsubscribe send an email message to: <RE-wrenches-unsubscribe at topica.com>

Hosted by Home Power magazine: <http://www.homepower.com>

for info contact: <michael.welch at homepower.com>

_____________________________________________________________
What's hot at Topica?  Sign up for our "Best New Lists" 
newsletter and find out!  http://www.topica.com/t/8