I just realized that, while Vic and I both assumed you were asking about the MPPT input capacity, on second look it appears you were really asking about whether the FWC wiring could handle the current from two 175 watt panels wired in parallel and connected to the roof connector.
On my 2021 Grandby I believe the wires are 10 awg, and I have my two 200 watt panels wired that way. Because when the panels are generating 50% or more of their rated levels their output voltage to the MPPT is 25 to 30 volts, the current from both panels totals under 20 amps. The 10 awg wire is more than adequate for that current.
The conservative way to check wire size adequacy for a PV array (for simple wire heating, not voltage loss for long runs) would be to use the short circuit current of the array in sizing the wire. The 10awg wire is adequate when checked this way as well.
Thanks again. Yeah, I was more concerned about the stock plug and wiring since the specs from the victron unit seemed fine for both panels. But I was appreciative of the advice nonetheless!
