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DC Disconnect-Am I on right track?

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rwh

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After reading lots of comments on the forum, I want to purchase an IMO DC disconnect. I want to be sure I'm making the right decision.
I have a ground mount with 4-200w/12v Rich panels and will be wired series-parallel.
Based on the panel specs, I think I should get the IMO SI32-PEL64R-4S. This one is rated at 32A/1000VDC. Any thoughts and opinions appreciated.

rich solar.png
 
Last edited:
2P2S will give you 48.6Voc (plus the usual margin) and Isc of 20.4A so while that switch might work, it feels like overkill.
 
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The thing that I don't have a clear understanding about is the "maximum system voltage" of the panels which is 1000VDC.
The dc disconnects seem to be rated at 600, 700 or 1000VDC so I'm assuming that I need a 1000VDC disconnect but not certain.
 
One PV panel is 24.3Voc
How many are you connecting in series? That determines what switch rating is required.

Down under 48V (2 panels in series) or 125V (5 panels in series) there are quite a few choices.

How many panels or strings of panels in parallel?
It would look like 3 strings in parallel could be switched, but
1) more than 2 in parallel require individual fuses
2) Design wires, fuses, switches for current 1.56x Isc of the array.
 
2 series/2 parallel. I was planning on having 20A inline fuses on the 2 positives before the Y branch. Then to a disconnect.
 
rwh said:
2 series/2 parallel.
Click to expand...

rwh said:
I have a ground mount with 4-200w/12v Rich panels and will be wired series-parallel.
Click to expand...

(I seem to have a reading comprehension problem. Or I just skim over.)

2 parallel, fuses not required.
2 series is about 48V.

Lots of switch options.
Midnight breakers.
Cheap rotary battery isolator switches rated for 48V max
Square-D QO series breakers.

But that IMO switch already packed for $90 isn't bad.
I'd have to scrounge to put together Square-D box & breakers to match that.

signaturesolar.com

IMO DC Disconnect Rooftop Isolator Switch

IEC 60364-7-712, dc disconnect, imo, ul listed, DC AC, DC DISC
signaturesolar.com signaturesolar.com
 
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