Measuring PV kWh on net metered systems [RE-wrenches]

[Doug Pratt]

A high-end solution is Ethan Brand's "One Meter", for those that want to
send data to their PC or other data logger. He uses a single AC
transducer, the AC1 input/output wire goes thru in one direction, the AC
output wire goes thru in the opposite direction, so any grid power that
passes thru the inverter to support loads on the AC output terminal gets
automatically zeroed out. This is an $800 solution, but it will monitor
all DC and AC power flow, and send all the info to your handy-dandy
spreadsheet.  I encouraged Ethan to develop a package that would monitor
power in and out of the SW or any other intertied, battery-based system,
this is what we came up with. I've ordered a couple of them, and will be
installing one on my son-in-law's 7kW system (when it arrives). I'll let
the list know how it works out.
Doug Pratt
Dear Joel,

We use standard Kwhr meters with detents that allow
flow in one direction only. A Brand meter will do the
same if you "plug" the meter into the AC1 output and
put the grid on the meter load side. (for up to 1850
watts.)

Yours,  Peter Talmage

--- Joel Davidson <joeldavidson at earthlink.net> wrote:
> How do you measure solar energy flowing one-way to
> the grid on the AC1
> connection of an SW-series inverter? Is there a
> one-way transducer
> available so that the circuit does not have to be
> opened?

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