Adding another solar panel

[IronmanMLR]

I am adding a new solar panel to my 2008 Jayco Jay Flight 26bh and wanted advice on installing it on the roof to prevent leaking. I have a 125 watt GoPower! solar panel that I had installed by the dealer when I purchased it. The new 145 watt solar panel is an expansion kit that comes with a "y" connector that allows you to plug straight into my existing panel so the wiring isn't going to be a problem. The original solar panel came with a charge controller and can handle up to 400 watts. My biggest concern is leaking were I mount it to the roof and cutting cleanly through the rubber roof cover for the attaching bolts. Any advice?

[phemens]

I just added a couple of new panels to my setup last weekend, same idea. Don't worry too much about making holes in the roof, just make sure you caulk very well. I drilled holes, pumped in some Dicor self-levelling, placed the Z brackets (put some Dicor on the bottom of the bracket as well), then when the panels are in place, apply the self-levelling liberally. I took the opportunity to strip the old caulking off the existing panel and re-apply.
I will probably lay some Eternabond tape over each bracket, since I have some lying around.

[IronmanMLR]

when it comes to the possibility of extensive water damage, I guess there is no such word as overkill.

Thanks for the reply.