KWH meter discrepancy [RE-wrenches]

[Kelly Keilwitz]

Wrenches,

We recently installed a small PV GT system with a SMA SB700, with display.
We also have a utility style "green tags" meter on the AC output. It's been
running for a couple of months and the SB display is recording 18% higher
energy production than the green tags meter. The green tag meter is a form
2S, 240-V meter, wired for the 120-V output of the SB700.

We've wired 240-V meters for 120V operation before but never had a
(reliable) KWH meter to gauge against. Is the SB display meter reliable? Any
problems with wiring 240V meters for 120V output?

Thanks,
-Kelly

Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd, 
Coupeville, WA 98239
PH & FAX 360-678-7131
sunwind at whidbeysunwind.com
 


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