Hello,
I am combining -4- series strings at the array in a series-fused combiner. The sum Isc of the four strings is 22.64 adc. I want to use either a HU361(30 amp) or HU362(60 amp) as a disco at the inverter instead of running individual strings a long distance from the arrays to the factory-supplied SMA fused disco. So the Isc rating for the HU361 Is 11.5 amps per pole, the HU362 is 38 amps per pole. Although not clear in the SQD datasheet, I think that if two poles are series together the DC(non-pv dc) rating is a full 30 amps for the HU361, and 60 amps for the 362. But the limiting factor in a PV application is the per-pole Isc rating, regardless of putting 2 poles in series (this does not increase the Isc rating of the respective disconnect), correct? I'm assuming my only choice in this instance is to use the 60 amp disco? Kirk Herander VT Solar, LLC dba Vermont Solar Engineering NABCEPTM Certified installer Charter Member NYSERDA-eligible Installer VT RE Incentive Program Partner 802.863.1202
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