Hi boB,
Would there be any issues with delayed control of
the microinverters? We do plan to use disconnects for maintenance.
Thanks,
Drake
At 06:27 PM 8/29/2017, you wrote:
Content-Type: multipart/alternative;
boundary="------------155C815B9802686293824DDD"
Content-Language: en-US
SSRs, especially AC SSRs made from thyrisotrs
(scrs and/or triacs)Â are "leaky" in general
so when turned OFF, can cause a
shock.... Maybe not enough to kill you but maybe enough
to make you fall off the roof !
I'm not sure why the disconnects aren't good
enough which should already be in place ?
boB
On 8/29/2017 4:53 AM, Jason Szumlanski wrote:
My vote would still be to use two single pole
relays as suggested previously to kill each
leg. That way you build in redundancy and
dropping either leg will do the trick. In fact,
it sounds like this would be even better than a
two pole relay for the redundancy reason.
The other factor is whether you are using NO or
NC relays. My engineer requires NO relays in
these cases so they would fail in the open
position only. I'm not sure how this would
work, or if it would work with solid state
relays. I have never dug into this. My
understanding is that solid state relays fail
in the closed condition (shorted). This would
preclude their use in a situation where opening
the circuit is the preferred failure mode.
Maybe someone with some more knowledge in this
area can chime in on whether SSRs are a good idea in this scenario.
Jason Szumlanski
On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil
<<mailto:[email protected]>[email protected]> wrote:
The one-pole relay will work for de-energizing
any of the Enphase microinverters.
Nick Soleil
Field Application Engineer
Enphase Energy
Cell: <tel:%28707%29%20321-2937>707-321-2937
On Aug 28, 2017, at 6:03 PM, Drake
<<mailto:[email protected]>[email protected]>
wrote:
Hi Nick,
I should mention that the inverters being AC
coupled are M-250s, not the new IQ series. Would that make any difference?
Thanks,
Drake
At 03:12 PM 8/28/2017, Drake wrote:
Hi Nick,
At 11:20 AM 8/28/2017, you wrote:
Content-Language: en-US
Content-Type: multipart/alternative;
      Â
 boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"
You can use a one-pole relay. We show
one-pole switching in our zero-export,
self-consumption doc for PEL applications.
Nick Soleil
Field Application Engineer
Enphase Energy
Cell: <tel:%28707%29%20321-2937>707-321-2937
On Aug 28, 2017, at 6:44 AM, Drake
<<mailto:[email protected]
> [email protected]> wrote:
Hello Wrenches,
I am going to AC couple some Enphase
inverters and found some really nice solid
state, single pole relays to control them
with. Enphase says I must use 2 pole relays
for the control current even though the
disconnects will turn off all power for maintenance.
Enphase claims that the inverters will not
shut down reliably with only one line
opened. This does not make sense to me in
view of UL 1741. Is Enphase correct in
their claim, or are there other reasons that both poles need to be opened
I want to use the solid state relays
because the coil voltage is between 3 and
32 volts. This would avoid the need to add
voltage dropping series resistors to
protect the coil for higher battery voltages.
Alternatively, does anyone know of
reasonably priced, 2 pole solid state relays?
Thanks,
Drake
Â
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
<tel:%28740%29%20448-7328>740-448-7328
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