On 8/30/2017 5:54 AM, Drake wrote:
Hi boB,
Would there be any issues with delayed control of the microinverters?
We do plan to use disconnects for maintenance.
Thanks,
Drake
I highly doubt there would be enough delay to worry about anything
regarding battery damage....
Even with Rule 21 or its cousins in a normal home installation.
boB
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
<nsol...@enphaseenergy.com <mailto: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: 707-321-2937 <tel:%28707%29%20321-2937>
On Aug 28, 2017, at 6:03 PM, Drake
<drake.chamber...@redwoodalliance.org
<mailto: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: 707-321-2937 <tel:%28707%29%20321-2937>
On Aug 28, 2017, at 6:44 AM, Drake
<drake.chamber...@redwoodalliance.org
<mailto: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
740-448-7328 <tel:%28740%29%20448-7328>
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