[RE-wrenches] AC Coupled Enphase

[Nick Soleil]

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

On Aug 28, 2017, at 6:03 PM, Drake <drake.chamberlin at redwoodalliance.org<mailto: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;
         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

On Aug 28, 2017, at 6:44 AM, Drake < drake.chamberlin at redwoodalliance.org<mailto: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


Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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