[RE-wrenches] AC Coupled Enphase
bob at midnitesolar.com
bob at midnitesolar.com
Wed Aug 30 15:13:58 PDT 2017
On 8/30/2017 5:54 AM, Drake wrote:
> Hi boB,
>
> Would there be any issues with delayed control of the microinverters?
> We do plan to use disconnects for maintenance.
>
> Thanks,
>
> Drake
>
I highly doubt there would be enough delay to worry about anything
regarding battery damage....
Even with Rule 21 or its cousins in a normal home installation.
boB
> 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.... 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;
>>>>>> Â Â Â Â Â Â Â Â
>>>>>> 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
>>>>>>>
>>>>>>> Â
>>>>>>> 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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