Age old question....but??

NEVER 5200 ! It will fail (at least as a sealant) and it is next to impossible to get off ! The 3M tape pressure sensitive tape does a very good job of bonding.

I am also of the opinion that NO SEALANT LAST FOR EVER ! You are better off putting a wad of butyl around the screw between the bracket and the roof and be prepared to replace it in 3 - 5 years.

I’ve never seen an RV solar panel along the road. If it concerns you use six Z brackets and glue or tape. You’ll love your system provided you have adequate batteries, wiring and panels coupled with a good controller.

I would use Dicor Fiberglass Roof Coating. Proceed by the steps below.

Roof coating under Z brackets > screw down Z brackets > cover Z brackets with roof coating

Don't use Z brackets as they are difficult to remove when needed. Use alimunium angle, cut 2 pieces and bolt them together for your Z bracket.

Angled aluminum sounds like an interesting thought....in that way, the brackets could be cut as needed. I'll have to check into that. Thanks???? thanks to all for ideas!

3M VHB 4950 tape is proven to be extremely reliable.....and no holes in roof needed!

On a related thought, the 12 charging/electrical has always been an issue somewhat on my older 96 Vogue, from figuring out the Duvac alternator to the old Sure Power battery isolator and to the Aux start solenoid. Makes a long story short , I've changed things up quite a bit over the years. For reasons that I can't fully explain in full here, I was thinking of separating the solar to my house/chassis batteries. Since I have a residential fridge, I want to be sure my chassis battery has no chance of discharging. I accomplish this now via two means, one is the use of the motorhome battery cut off solenoid and the other is hard wired battery switches near by batteries( on that subject, I have 6-6 volt house and 1-12 volt 8d as a chassis battery ) .... I'm thinking 6-800 watts of panels, using a PWM controller for maybe 100 watts to the chassis and a MPPT for the remainder of watts to my house batteries.

Ok....I know that's a lot to read, but your thoughts are sought and appreciated.

CA Traveler wrote:
Don't use Z brackets as they are difficult to remove when needed. Use alimunium angle, cut 2 pieces and bolt them together for your Z bracket.

That is what I did using 1/4 inch stainless steel bolts to the panels and between the angles.

LeRoy

Homeless by Choice wrote:

CA Traveler wrote:
Don't use Z brackets as they are difficult to remove when needed. Use alimunium angle, cut 2 pieces and bolt them together for your Z bracket.

That is what I did using 1/4 inch stainless steel bolts to the panels and between the angles.

LeRoy

SS is great. I buy from Bolt Depot and while they will sell small quanities I get 100 count packages at a great price. Lots of SS bolts, screws etc for future projects.