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Yes. Makes a lot of sense now. Thanks for the clarification. My goal is OCP and disconnect hence will use double breakers.

Yes my system uses metal conducts for the PV to combiner box. Combiner box to Charge controller will be with 6x6 wire way and metal conducts. There will be no external disconnect as I don't like the idea of people messing with my stuff. This is on-grid with potential selling. Let's find out if...

Background: I am building a combiner box. The install is in a Central American country and there won't ever be any inspection by any authority hence I build as it makes sense more so than what is required. 2 PV strings that will be combined in parallel inside the box. Currently doing design...

Good explanation and I feel the same about an AC circuit needing an OCP on neutral. Anyways...I am reconsidering and will now designing it with one circuit breaker per each PV positive and negative (2 per string) with a double DIN-Rail breaker. Then combine the strings after that point. This...

I am using an Outback FM-100 charge controller that supports up to 300V PV input. The Pv's are "BlueSun" BSM50M10-72HPH The NMOT Open Circuit Voltage is: 48.18V while the STC Voc is: 49.3V I can safely series string 5 panels and max out around 250V. My plan was to circuit breaker each string...

I plan to combine with a DIN Rail block. I think this will make for a lean clean install. And yes the SPD will be one of those "ports".