Hi Howie,
So Jay found this
from previous posts (below). So apparently the -40 series will work in
Off-grid mode (as long as you program the SBs separately to be in OG)
but won't do the switching of modes necessary for grid-tie backup. I
plan on a call to SMA tech support Monday morning to get to the bottom
of what exactly is lost without the RS485 comm. And to see if TLs are
still going to work as the new SIs tech sheet shows they are not
supported. why I have no idea but I intend to find out.
hope
that helps.
Best,
Jeff
Begin forwarded message:
Subject: Re: [RE-wrenches] SMA US 40 & AC
coupling
Date: March 13, 2017 at 10:23:56 AM PDT
I
talked with Tim at SMA today, and the new Sunny Boy inverters will
provide taper charging with the Sunny Islands even though no RS 485
communication is available. The Sunny Boys need to be programmed in the
off grid mode, and the Sunny Islands will take care of the UL 1741
requirements.
The graph below shows the relation between
frequency shift and % power produced by the Sunny Boy inverters.
![Emacs!]()
Drake Chamberlin
Athens
Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
http://athens-electric.com/
At 11:36 AM
3/10/2017, you wrote:
I
just checked with SMA and they do not have an RS485 card for the -40
inverters. What this means is that you can set them up to be permanently
in off grid mode where the SB will follow the frequency shift of the
SI, ok for an off grid system. But for grid tie with backup, the SB will
not communicate with the SI and will not change the SB to off grid
mode. It will still work like other generic AC coupled systems where the
frequency shift will cause the SB inverter to drop off line, but as far
as I know no throttling back will happen.
Brad
Howie Michaelson wrote:I'm confused. Does this mean the -40 series
are not compatible with SI off grid mode? Or they don't adjust output
due to frequency shift? Or? Howie
Howie Michaelson
NABCEP
Certified Solar PV Installer™
Sun Catcher
Renewable Energy
Systems Sales and Service
VT Solar Electric Incentive Partner
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