balancing from 120 to 240 [RE-wrenches]

[EH Roy]

Darryl,

Any inverter listed to UL 1741 will disconnect from the utility grid if the
grid is out of spec. If this is happening regularly, your customer should
request that the utility put line loggers at his/her service entrance. This
will show the utility that their power is out of spec and they are required
to fix that. We have had this problem (both grid voltage too low and grid
voltage too high) and the utilities have installed line loggers and then
corrected the voltage. It happens more often than the utilities admit -
often at the end of a transmission line.

Not sure why you want to balance the power from an SMA inverter. If it is a
SB2500, it is already  sending power to both legs. If it is a SB1800 it is
only going to one leg but the grid will provide what is needed on the other
leg. I doubt the transformer is compatible. The SB inverters are very
impedance sensitive. How about it SMA?

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 12:04 PM
To: re Wrenches
Subject: balancing from 120 to 240 [RE-wrenches]


Hello to all
Does anyone know can I use a Xantrex or Outback x240
transformer to balance power from an SMA on to a load
on a service panel?

My customer in the north woods is concerned with very
poor power quality and would like to have the SMA put
power on both sides of his service.

Speaking of poor power quaility will I have trouble
with utility voltage sag and the SMA?

As a note, last summer I had problems with a
Solar-UPS-grid-tie  Where the voltage sag caused the
SW to drop the line and take over load, so many times
that the system up set the homeowner.  Any comments is
this voltage sage problem occur for other people? help
on this also.

Daryl

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