Who else has roof mounted a lot of solar panels? Our house has 2x4 rafters on 24” centers which is not ideal for about 2,000lbs of panels and mounts.
Adding collar ties and struts to beef it up.
Any other ideas?
Today was probably the last cool day in Texas til fall so it had to be done!
One step closer to moving the whole house off grid and only using city power as a backup..
#solar grownostr #homesteading 
Wish I could’ve made it to the last day of exit and build but this solar system ain’t installing itself
#grownostr
Nice work man! Way to get after it. My old farmhouse also had 2x4 rafters on 24” centers. Eventually I added a legitimate ridge beam that was well supported on each end, and then sistered to the 2x4s with 2x10s. She’s rock solid now. 
Love it, nice work!
What type of mounts are you using? Are you planning on hitting every rafter? Is there an equation you’re using that makes you think it can’t handle it?
I’m using 2 rails of the thinner unistrut with 5 inch lag screws going into every rafter.
I don’t have any equations but think the reinforcements should be sufficient. Generally I tend to overdo it so I never have to mess with it again
I install residential rooftop solar and we use some equation of wind uplift to determine the number of connection points. I do not know the equation but the majority of our installs are with connection points at 64 or 72 inch spacing. And we use 3.5 inch lags with an L foot bracket providing around 3-4 inches of stand-off space from the roof surface
Nice! Yea it’s a balancing act of wanting some air gap to dissipate heat from the roof and creating a sail for the wind to catch lol
