[RE-wrenches] SMA Tripower

[William Miller]

Colleagues:



Ronnie Raxter of SMA has a training video on the SMA web site in which she
sites just this clause.  Showing this to an inspector or plan checker may
convince them.



Ms. Raxter has been very helpful and responsive to many inquiries I have
made regarding the various SMA products.  She is definitely an asset to SMA
and installers.



William



[image: Gradient Cap_mini]
Lic 773985
millersolar.com <http://www.millersolar.com/>
805-438-5600



*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Garrison Riegel
*Sent:* Thursday, September 01, 2016 6:39 AM
*To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
*Subject:* Re: [RE-wrenches] SMA Tripower



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> 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™ R031508-59

520.204.6639



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



SEI Professional Services

http://www.seisolarpros.com



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