Hello,
For now, SAM does not limit the operating currents or voltages in the system, so it is possible to model system configurations that in practice may exceed the inverter design limits. Keep in mind that SAM is a pre-feasibility model, not an engineering design tool. You can use SAM to get a good indication of what the system will cost to operate, and to make some early decisions about the project's financial structure, but it is not appropriate for making more detailed technical design decisions.
You can do some rough checks on the limits as you describe, but because, as you note, SAM runs hourly simulations, you have no information about voltage and current levels within each hour.
Best regards,
Paul.