Ok, I am adding another 85 watt panel to my array. The problem I have is, My first panel I could attach by running 1/4 lags into the rafters, eternabonding the feet and I was good to go.
Now I can only position the panel in a area that the rafters do not match up as before. My roof is a rubber or EPDM with a thin sheeting (non walk on roof). Has any one mounted panels to such a roof? Can I use Hollow wall anchors? I will dicor and eternabond the heck out of the mounts.
just wondering what other rvrs have done?
Also,,I had run 12/2 duplex with the previous panel, but now I am thinking of running 10/2, I found Marine Duplex at West Marine localy, what is the preferred wiring used?
Thanks in advanced for your help!!
I don't think I got any of my roof mounts into the steel that makes up my roof support system, it is 1-1/2" square tubing with rafters located at random areas, so it might be 24 - 48 inches apart.
What I did was put 6" long 2" angle aluminum on the 4 corners of each panel, with 3- 3/16" holes in one side of the angle aluminum, and a 5/16" hole for a 1/4-20 bolt on the other side. Nutserts on the solar panels, and tamper resistant bolts finished the project. I put in 3 - #10 screws into the 3/8" think plywood roof, and put rubber roof sealant down first, then the screws into the three holes, and then rubber sealant above the screw heads.
No need for Eternabond, but use it if you want to. Just don't put Eternabond over fresh sealant, as the chemicals inside the sealant will not have time to dry out and outgas before being sealed in under the Eternabond, and might not cure properly.
My mounts lasted over 14 years, then I coated the whole roof with Herculiner, and that sealed them into the roof in such a way I could not remove one for $100 in cash - if I wanted too! I will leave these mounts for the next owner, and buy new ones if I transfer the solar equipment to another RV or my home when I sell this RV.
Yes your basic energy needs require at least 150 watts in solar, just to make up for the propane leak detector, CO leak detector, and refrigerator power - a total of about 35 amp hours per day. Anything you make above 35 amp hours can be used to run the water pump, lights, TV set, ect.
Don't worry to much about not hitting a roof mount, the 2" wide X 6" long mount will stick to the roofing material without the screws in place (yes I tried moving one once) just because there is 12 square inches of rubber roof sealant holding it in place.