Wrenches
We are taking two very different issues and mixing them together. RSD and
Arc-fault are different, arc fault will and does prevent fires, RSD was
brought out of the need to vent a roof that even with the meter pulled have
500 volts and resulted shocks to fire fighters by cutting into roofs
Rapid Shutdown does not prevent fires; it was originally drafted to
allow firefighters to vent a roof without being hindered by energized PV
arrays. This rule was expanded to include other DC wiring from PV
sources.
As for PV safety, I'd like to see some significant, statistical evidence
that s
"Rapid Shutdown does not prevent fires."
Not true. If the effect of RS is to steer the market to MLPE, I believe it
has a significant impact on reducing fire risk. As one who has watched a DC
conductor fire smolder out of control, I am sold on an AC module or
microinverter architecture. While RS o
I have been to several PV fires for string inverter systems, both
commercial and residential, and have seen many DC systems at serious risk
of fires or in various stages of melted insulation and connectors. Most of
these systems have exhibited good to excellent workmanship. Things just
went wrong.
my two cents worth, 690.11 says turn off from all arcs, that means serial
and parallel
that means module lwevel shutdown
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I agree, 690.12 should have exemptions for lower voltage, lower power
systems, and shorter runs; especially off grid. 10 years ago, I was
promoting some type of remote controlled disconnect at the array, but
that was for voltages over 400v, with unprotected conduit runs over a
100 ft long, on
How much would you pay for an FM 80 manufactured in 03/2012? It works.
It came out of a system with 4 controllers, one failed? I want to use it
for a temporary, while failed controllers are in the shop or having
replacements shipped.
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My 2 cents are related to the very few times I have had to do RS for
offgrid. My advice is to install whatever the inspector wants, assuming he
can't be convinced of the mindless requirement. Complete the installation.
Do the right thing after by abandoning it. Have the client remove the RS
signi
Hi Drake
I will disagree, there have been many roof top fires.
But regardless we have to do these new regulations and I for one welcome the
safety.
The main issue is accessing the faulty/suspect component under the module
possibly requiring removing multiple modules, a slow and expensive pr
Clearly, rapid shutdown increases cost and reduces reliability. Given
the excellent safety record of PV, prior to rapid shutdown being
required, it is unnecessary. The few anecdotal incidents of PV fires
were not enough to justify the requirement, especially on smaller
systems.
According to a f
Hi Corey - As we've grown, and as our fleet of installed systems has grown,
I've become increasingly interested in choosing an inverter solution that
shows per-module production data. I realize that you specifically asked not
to consider optimizers or microinverters, but I wonder if that will be a
So far rapid shutdown has been a nightmare. It’s added a lot of cost for no
measurable benefit.
Using always off devices like midnight solar and Tigo makes it impossible to
test open circuit voltages. Which opens the door to tons of problems when
commissioning systems.
Also we’ve been trying ou
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