The TL-22s are notorious for nuisance arc fault
tripping. Is your array on a metal roof? Large
metal roofs can amplify RF signals and cause tripping.
At 05:32 PM 9/29/2017, you wrote:
Hi All, Iâm wondering if anyone else is having
trouble with the SMA Rapid Shutdown Box. We have
an installation where an SMA 7700TL-US-22
(rebranded as SunPower) is fed by an array with
a Rapid Shutdown Box. Many, but not all,
mornings, the inverter would fail the AFCI
self-test on wakeup. When reset, it would
operate fine all day. There was never an actual
indication of an arc fault, just the self-test
failure. SunPower, in consultation with SMA,
decided to replace the inverter. Everything
worked normally for a couple of weeks, then the
problem resumed. Again, no arc-fault indication,
just the self-test failure and then full
operation the rest of the day after resetting.
We began to suspect the Rapid Shutdown Box, so
we bypassed it completely, and there were
absolutely no problems for several weeks. SMA
was then willing to replace the RSB, after which
everything worked fine for about a week, then
this morning the same issue. Again, self-test
failure, then when reset, it has to go through
another self-test, which it always passes and
then runs all day. Has anyone had problems with
the RSB, or, with AFCI in general? Based on this
experience, this is the second and last RSB
weâve used, and have somewhat reluctantly gone
to all micro inverters to meet rapid shutdown.
Bruce Erickson Mendocino Solar Service PO Box
1252 Mendocino, CA 95460 707-937-1701
707-937-1741 fax br...@mendocinosolar.com
Connecting Mendocino County to Solar Since 1994
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