High Voltage DC Disconnects
Just in the process of building another off-grid solar system and am currently planning the DC wiring/ breaker/ fuses.
I will be using 18 - 350 watt panels wired in 2 strings, combining in a MNPV3 using high voltage, finger safe fuses.
My concern is how to isolate incoming DC power when and if it is sunny and system is under load. Obviously this is why "rapid-disconnect" is on the market........ Especially since the SCP is discontinued and now would have to log in to the insight to put things in standby....
I was hoping to simply use an appropriate DC rated disconnect, as a point of isolation before the PV wire enters the PDP and into the 100A 600V Charge controller, and and as such am reviewing the options listed in the link below.
Would it be better to combine the two incoming strings first, and then run the one wire through one of the poles on a DC disconnect or run both string wires through the disco first and then combine? Or does it matter. The finger safe fuses have no open contact once the fuse holder is opened, however I would not think it would be wise to open the fuse holder while under load.......
Thanks for any insight or direction to any who may respond.........
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