[RE-wrenches] AC Coupled Enphase

Tue Aug 29 06:59:42 PDT 2017

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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