[RE-wrenches] AC Coupled Enphase

Tue Aug 29 04:53:21 PDT 2017

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>
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 <(707)%20321-2937>
>
> On Aug 28, 2017, at 6:03 PM, Drake <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 <(707)%20321-2937>
>
> On Aug 28, 2017, at 6:44 AM, Drake < 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
>
>
>
>
>
>
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