There is some pressure on NM specifically to postpone adoption of 690.12
until more products are available, so that may help you out. To my
knowledge, micro-inverters don't need to comply with 705.12(D)(6) since
there are no suitable products available [90.4]. Equipment does need to
be listed, and it does need to provide rapid shutdown functionality, but
it does not need to be "listed for rapid shutdown" to be code-compliant
since that isn't a thing.
String inverters generally speaking would have to have some method of
"control" within 10' of a rooftop array, like contactor combiners. I'm
interested in seeing what SMA's solution is, since contactor combiners
(as discussed earlier in this thread) aren't well suited for these
multi-MPPT inverters. I guess you can always add a second contactor but
I don't know what listed equipment is available right now (so... 90.4?).
DKC
On 2014/10/9 12:41, Randy wrote:
Hi Wrenches,
We are being forced to adopt 690.12 Rapid Shutdown requirement based
on several explanations given to our industry:
1.otherwise we would be ignoring the life safety and put our fire
fighters lives in peril
2.This product can be constructed from readily available,
over-the-counter code compliant components. This (is) to be the
intent of CMP4when compiling the NFPA70.
We do not want to act like an industry that appears to be fighting
against safety. And we know there are a few products that are code
compliant, micro-inverters (don’t comply with 705.12 (D) (6) because
there are no products), Solaredge, and Tigo (is it approved?) yet this
is not how we choose products.
And the SMA SPS inverter is not going to work in a 690.12 environment
without complications as far as I can see.
Appreciate comments that might support the right decision.
Thanks,
Randy
Randy Sadewic
Cell: 505 570-0137
ra...@positiveenergysolar.com <mailto:ra...@positiveenergysolar.com>
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*From:*RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org]
*On Behalf Of *Steve Jefferson
*Sent:* Tuesday, October 07, 2014 8:33 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] TL Inverters
The first gen of TL’s did have a somewhat tight window for the DC window.
However, the new SBxxxxTL-US-22 (3kW – 7700kW, with secure power
supply) Start Voltage is 125, MPPT is 175-480 (max of 600Vdc)
Also, for larger needs, the STP (12kW – 24kW) start voltage is 150,
MPPT is 300-800V (max of 1000Vdc).
SMA America, LLC
Steve Jefferson
Service Line Supervisor
3925 Atherton Ave
Rocklin, CA 95765 - 3714
U.S.A.
Tel: +1 916 625 3185 (direct)
Fax: +1 916 625 0871
Mobile: +1 916 622 4253
Email: steve.jeffer...@sma-america.com
<mailto:steve.jeffer...@sma-america.com>
www.SMA-America.com <http://www.sma-america.com/>
cid:image001.png@01CF1CFA.FE18BEB0
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This email and any attachments thereto may contain SMA America, LLC
confidential, privileged and private material for the sole use of the
intended recipient. Any review, copying, or distribution of this email
(or any attachments thereto) by others is strictly prohibited. If you
are not the intended recipient, please contact the sender immediately
and permanently delete the original and any copies of this email and
any attachments thereto. Thank you.
*From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org]
*On Behalf Of *Mark Byington
*Sent:* Tuesday, October 07, 2014 6:59 AM
*To:* RE-wrenches@lists.re-wrenches.org
<mailto:RE-wrenches@lists.re-wrenches.org>
*Subject:* Re: [RE-wrenches] TL Inverters
Just a word of caution to those not having experience with SMA TL
inverters - the larger units (7-11 kW) have an extremely narrow input
DC voltage window. Depending on your module voltage and string
design, all you need is a module or two to be shaded to fall out of
the MPPT input voltage range. The smaller units (3-5 kW) with the
Secure Power Supply don't have this problem. We no longer use these
larger SMA TL inverters unless we can do maximum string length (e.g.
strings of 8 for SunPower 96-cell) and there is zero shade at the site.
I believe SMA is in the process of adding larger units to the line
that has the Secure Power Supply. They added the 6 kW unit earlier
this year, and just announced the 7 kW unit with Secure Power Supply.
Mark Byington
Cobalt Power Systems, Inc.
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