PV system meters [RE-wrenches]

[Bill Brooks]

Graham,

I would always wire a production meter to run in the forward direction. The
negative convention of the SW inverter made some sense for what it did, but
production should always be positive with grid-connected systems.

The tough thing to measure with a typical kWh meter is battery-based
systems. You have two AC outputs, one of which is bidirectional. You can use
two kWh meters, but you have to add the two readouts. If you use more than
you produce on the utility AC connection, that meter will have a negative
reading.

Bill.


-----Original Message-----
From: Graham Owen [mailto:graham at solarexpert.com]
Sent: Thursday, August 22, 2002 10:09 AM
To: RE-wrenches at topica.com
Subject: SPAM: RE: PV system meters [RE-wrenches]


Bill,

Would it make sense to wire non-digital PV performance meters so that
the meter runs forward as opposed to backwards?  It seems like this
would prevent any type of confusion.  I have seen systems with two
meters and the PV meters were spinning backwards.  I would think a new
meter set at zero and wired to spin forwards will make it much easier
for homeowners to document their solar KWH benefits.

Graham

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