[RE-wrenches] AC Coupled Enphase

Tue Aug 29 09:47:43 PDT 2017

Probably a good idea to test that HBCO is set right, actually does shut
down the inverter, and stays programmed correctly in a LBCO or complete
drain of battery.

Dave DrakeDave
> 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:nsoleil at enphaseenergy.com>nsoleil at 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.chamberlin at redwoodalliance.org>drake.chamberlin at 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 Â Â Â Â Â Â
>>>>>Â  boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"
>>>>>
>>>>>You can use a one-pole relay.Â  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.chamberlin at redwoodalliance.org>
>>>>>  drake.chamberlin at 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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Dave Angelini Offgrid Solar
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