Question about plugging in a Portable Panel through existing MPPT

[Naruto]

Hello all,

I am planning on installing two 120watt "24 volt" panels in parallel on my roof top. These panels are 120W 40.5Voc and 3.7Isc each.

I have a third identical panel that I would like to use as a portable panel occasionally. And when it is deployed, all 3 panels will be in parallel and all feeding into my MPPT charge controller. I want to be sure folks understand this is just a panel and not a solar suitcase with its own built-in controller.

My concern is with plugging in the portable panel. Even if the Circuit Breaker is open, so that the roof top panels are disconnected from the charge controller, there will still be ~40 volts on that connector junction. Will this arc when the portable panel is plugged in? Am I going to char up the connectors over time? Is there a better way to do this?

Thanks
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[Mike90250]

MC4 connectors are only rated for a dozen or so operations, they are not suitable for repeated plugging/unplugging, and when disconnected, the inner contacts are exposed to the elements and can/will corrode and become a fire hazard. Something else must be used. ( look for an Anderson connector rated for your voltage/amps )

If the breaker is open, there will be no current flow or arcing