My system has been approved by the electrical inspection agency.
The side of the array where power feeds the equipment ends up being about 11 feet off
the eave edge. Not exactly sure why the engineer shifted it so far off but I might go
over the issue with him shortly. As it stands now the RSBs would be placed
on the roof meeting the NEC 10 foot guideline. My first main concern is that on a
hot day the roof temperature at the shingles hits 140F and the SMA RSBs have
a recommended max op temp of 147F, not much wiggle room at the max.
So Question 1 would be
Are those RSBs going to survive that heat for even a few
years or burn out on a hot day in August?
Even if the array design was shifted so that it was maybe 4 feet off the eave edge,
getting the boxes within the 10foot NEC spec and on to the side of the house
in a more sheltered spot would end up with the RSBs being mounted
at about 8 feet above ground level. I dont mind that since theyre passive
and would be in a better spot but the electrician is probably going to
grumble about it before or during installation.
So Question 2 would be
How rigid is the NEC code 10 foot rule and is there any practical language in there for
mounting those RSBs a more practical distance from the array?
Not really interested in having the engineer add extra cost to my project by doing a
rework of that array layout page but not an impossible task and would probably
have to have the mod approved; a minor inconvenience.
Any advice on these issues?
Thanks
Negatron
The side of the array where power feeds the equipment ends up being about 11 feet off
the eave edge. Not exactly sure why the engineer shifted it so far off but I might go
over the issue with him shortly. As it stands now the RSBs would be placed
on the roof meeting the NEC 10 foot guideline. My first main concern is that on a
hot day the roof temperature at the shingles hits 140F and the SMA RSBs have
a recommended max op temp of 147F, not much wiggle room at the max.
So Question 1 would be
Are those RSBs going to survive that heat for even a few
years or burn out on a hot day in August?
Even if the array design was shifted so that it was maybe 4 feet off the eave edge,
getting the boxes within the 10foot NEC spec and on to the side of the house
in a more sheltered spot would end up with the RSBs being mounted
at about 8 feet above ground level. I dont mind that since theyre passive
and would be in a better spot but the electrician is probably going to
grumble about it before or during installation.
So Question 2 would be
How rigid is the NEC code 10 foot rule and is there any practical language in there for
mounting those RSBs a more practical distance from the array?
Not really interested in having the engineer add extra cost to my project by doing a
rework of that array layout page but not an impossible task and would probably
have to have the mod approved; a minor inconvenience.
Any advice on these issues?
Thanks
Negatron
Comment