FDS setup to understand smoke propagation around a pv system

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Hello everyone, as the title say I'm trying to simulate the smoke propagation around a pv. I have several doubts so I hope someone can help me.

1. Does anyone know how to set up a pv fire due to electric arc? Both in terms of material choice and HRR curve.

2. I need to evaluate wether the smoke is attracted to go inside the building due to openings on the roof, in your opinion it's better to measure the CO concentration in proximity of the openings or using a slice to measure the flux?

3. Does the roof material influence the analysis? It's certified for 30 min resistance and I was considering to model it as inert since I'll simulate just the smoke flow

TY