SMA and transformer [RE-wrenches]

EH Roy ehroy at solar-works.com
Wed Sep 10 07:59:38 PDT 2003


Darryl,

Did I miss something here? Is this customer in a net-metering state and if
so, why the concern about trying to use electricity during peak sun? Why not
use the grid as a storage medium and use the electricity when really needed.

The question is: if Darryl's customer is selling 1 kW on one leg and buying
1 kW on the other leg, what is the utility meter doing? Not spinning in
either direction, right? If so, why worry about balancing?

Grid power quality definitely needs to be fixed. Glad you are pursuing that.

E. H. Roy
Solar Works Inc.
64 Main Street
Montpelier, VT 05602
802 223-7804 x306
ehroy at solar-works.com


-----Original Message-----
From: Darryl Thayer [mailto:daryl_solar at yahoo.com]
Sent: Friday, September 05, 2003 8:46 PM
To: re Wrenches
Subject: SMA and transformer [RE-wrenches]


Thanks to all for response
Several asked why do I care, and here is more of the
story; the customer lives on a back road.  his power
will drop to 109 volts with the room air conditioner
on.  Or toaster or whatever.  I made the mistake of
selling him a SB1800 when I should have sold a SB2500
but I did not come up with this 120 volt vs 240 volt
problem.  He has a 1200 watt solar system, that is all
that he had money for and his good exposure was for
only 1200 watts.  He is willing to work to maximize
the solar for his live style.  Using electricity
during peak sun.

My choice is to put as much of the heavy loads on one
leg? My voltage would really sag on coincidence.  He
is served by a REA-Coop, who say the power is fine?

But in the end the customer is King.  And I want to
serve this percieved need.  So does anyone know, will
a T-240 or a X240 help or even work?

Thanks again.
And I am pursuing the utility problem, and will send
what I come up with.
Daryl



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