[RE-wrenches] AC Coupled Enphase

[Drake]

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