[RE-wrenches] AC Coupled Enphase

Wed Aug 30 05:54:16 PDT 2017

Hi boB,

Would there be any issues with delayed control of 
the microinverters? We do  plan to  use disconnects for maintenance.

Thanks,

Drake

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....Â  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 
>><<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:%28707%29%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:%28707%29%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:%28740%29%20448-7328>740-448-7328
>>>>>>
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