3 string DC DISCO for rooftop

[Zee]

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]

For reference, Eaton 30A, NEMA 3R, 6 pole, 600VDC disco .........$740
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.

 

[PWDickerson]

How about an IMO SI16-PEL64R-6? One web distributor sells it for $189.

 

[Zee]

I like it. Never heard of them. Think it will survive on the roof?

 

[SceneryDriver]

I like it. Never heard of them. Think it will survive on the roof?

I wouldn't think they'd do too well out in direct sunlight. Plastic isn't very durable after a few years of UV exposure. They'd probably do OK if shaded though.


SceneryDriver

 

[pv_n00b]

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]

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