On 8/20/2015 3:14 PM, Tom wrote:
Hi Jeff

Can you comment on the fact that these Enphase converters need 240ac
volts (grid connection) to run? This means that if ever the power
supplier locally ever shuts down for more than a long period of time
that these Enphase units become useless. Around my neck of the woods we
are getting more and more power outages lasting longer and longer. These
inverters require being connected to the grid to function.

I understand the safety requirement and it needing to do this to be
certified but it really limits the home owner (or cottage owner in my
case).

Have you ever worked on a system that was more practical? That qualified
for the grid program but was useful when detached from the grid? Seems
to me if ever the power company decides to cancel the program you may be
stuck with 40 inverters that are useless and are 200 dollars each.

Any comments are thankful,

Regards

Tom

Tom,

We don't do PV installations, but I have worked with a couple of
companies who do. Most of these installations will not run unless they
can synchronize with the 60hz line voltage - that is, when power fails,
the PV system doesn't run. I know there are some out there which will
run off of batteries, but not being familiar with the systems
themselves, I can't recommend any.

One other caution. At least here on the East Coast, you need a permit
to install a PV system. In many jurisdictions the wiring must be done
by a licensed electrician, although some will allow you to do it. In
most cases, if you are going to do it, you will need to take a test on
the National Electric Code before you are allowed to proceed.

And finally, the installation must be inspected by building authorities.
Failure to do so can cause all kinds of problems.

In short, a PV installation is not a DIY project. It's very complex,
with numerous building and electric codes involved. And a bad
installation can be a serious fire and electric shock hazard.


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Jerry, AI0K

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