[RE-wrenches] AC Coupled Enphase
bob at midnitesolar.com
bob at midnitesolar.com
Tue Aug 29 15:27:06 PDT 2017
SSRs, especially AC SSRs made from thyrisotrs (scrs and/or triacs) are
"leaky" in general
so when turned OFF, can cause a shock.... 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
> <nsoleil at enphaseenergy.com <mailto: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: 707-321-2937 <tel:%28707%29%20321-2937>
>
> 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 <tel:%28707%29%20321-2937>
>>>>
>>>> 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 <tel:%28740%29%20448-7328>
>>>>>
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