Thin vs. Bold Lines when using pencil tool to draw lines in sketchup

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Surfaces in an OpenStudio model should be contained with a surface group, such as a space, a shading surface group, or an interior partition surface group. It sounds like you are not inside one of those groups, or for some other reason, the you are drawing lines away from the existing surfaces in that surface group.

What is your intent, are you trying to turn convert walls or roof surfaces to PV, or do you want to draw shading surfaces and use them as PV?

If you are using walls as PV, you can set the entire wall as PV, and then enter a fraction of the surface to contain PV, vs .trying to model individual panels.