3 string DC DISCO for rooftop

Zee

Senior Member
Location
CA
Any recommendations on affordable, yet durable, dc discos for 3 ungrounded strings? (Ahem, per NEC 2017, "functionally grounded" strings.)

Want it to do well on roof: in UV and rain.

I believe i need 6 poles. 600 VDC.
 

Zee

Senior Member
Location
CA
For reference, Eaton 30A, NEMA 3R, 6 pole, 600VDC disco .........$740 :eek:
I am just trying to switch an inverter on a legacy resi. grounded system. The new one will of course be transformerless.
I want to do a conscientious job, by updating some items.
 

pv_n00b

Senior Member
Location
CA, USA
I just have to ask, why a disconnect for each string? Is this for RSD? If it were me I would use a switched DC combiner on the roof.
 

Zee

Senior Member
Location
CA
Triple MPPT inverter. Too many amps per mppt input of inverter if I combine the strings
 
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