[RE-wrenches] SMA Tripower

[Garrison Riegel]

Hi Brian,

Can we not invoke Art. 220.5(B) Fractions of an Ampere to round down to a 30A OCPD in this case?

I suppose that .1 could be pretty significant when combining many of these inverters.

Garrison Riegel
Solar Service Inc

On Aug 31, 2016, at 11:24 PM, Brian Mehalic <brian at solarenergy.org<mailto:brian at solarenergy.org>> wrote:

Hey Wrenches-
Just a heads up on the SMA Tripower - I like the inverter, but you gotta read the install manual!

Spec sheet says 24 A continuous output current for the 20 kW Tripower.  Install manual (and tech support) says 24.1.  That  extra .1 A takes you from a 30 A to a 35 A breaker.

Of course you should follow the install manual not the specs.  But what about the label on the side of the inverter?  Well I've seen more than a handful that are labeled with a flat-out 24 Aac output current.  What's an installer or inspector to do besides hope mfg's can get their numbers in order?

Upon closer examination, most of the STPs are 0.1 A higher than their spec sheet per the install manual - it doesn't really make a difference on the 12 or 15 kW models - just the 20 where you have to go up 1 standard OCPD size.  Pretty sure there's lots of 20 kW units out there backfeeding a 30 A breaker.  Hmmmmm....

Brian Mehalic
NABCEP Certified Solar PV Installation Professional(tm) R031508-59
520.204.6639

Solar Energy International
http://www.solarenergy.org

SEI Professional Services
http://www.seisolarpros.com

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