[RE-wrenches] AC Coupled Enphase

[Drake]

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

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