The plan is to use N/C relays. As this is in a
backup system, N/O relays would need to spend
most of their lives energized. The relays will
not be able to receive any control power while the grid is up.
If all else fails and the relays stay closed and
overcharge the batteries, the high voltage
disconnect of the Magnum inverter should shut the
system down before it becomes hazardous.
Drake
At 07:53 AM 8/29/2017, you 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:nsol...@enphaseenergy.com>nsol...@enphaseenergy.com> wrote:
The one-pole relay will work for de-energizing
any of the Enphase microinverters.
Nick Soleil
Field Application Engineer
Enphase Energy
Cell: <tel:(707)%20321-2937>707-321-2937
On Aug 28, 2017, at 6:03 PM, Drake
<<mailto:drake.chamber...@redwoodalliance.org>drake.chamber...@redwoodalliance.org>
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:(707)%20321-2937>707-321-2937
On Aug 28, 2017, at 6:44 AM, Drake
<<mailto:drake.chamber...@redwoodalliance.org>
drake.chamber...@redwoodalliance.org> 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:(740)%20448-7328>740-448-7328
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