Probably a good idea to test that HBCO is set right, actually does shut down the inverter, and stays programmed correctly in a LBCO or complete drain of battery.
Dave DrakeDave > The plan is to use N/C relays. As this is in a > backup system, N/O relays would need to spend > most of their lives energized. The relays will > not be able to receive any control power while the grid is up. > > If all else fails and the relays stay closed and > overcharge the batteries, the high voltage > disconnect of the Magnum inverter should shut the > system down before it becomes hazardous. > > Drake > > At 07:53 AM 8/29/2017, you 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:nsol...@enphaseenergy.com>nsol...@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:(707)%20321-2937>707-321-2937 >> >>On Aug 28, 2017, at 6:03 PM, Drake >><<mailto:drake.chamber...@redwoodalliance.org>drake.chamber...@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: <tel:(707)%20321-2937>707-321-2937 >>>>> >>>>>On Aug 28, 2017, at 6:44 AM, Drake >>>>><<mailto:drake.chamber...@redwoodalliance.org> >>>>> drake.chamber...@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 >>>>>><tel:(740)%20448-7328>740-448-7328 >>>>>> >>>>>>_______________________________________________ >>>>>>List sponsored by Redwood Alliance >>>>>> >>>>>>List Address: >>>>>><mailto:RE-wrenches@lists.re-wrenches.org>RE-wrenches@lists.re-wrenches.org >>>>>> >>>>>>Change listserver email address & settings: 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