EN 50618 cable in 4 and 6 sq mm. Structures rated for 150 kmph wind.
Galvanised or aluminium, wind-rated for your roof. "MS structure" on a quote is not a specification.
Surge protection, over-current protection, and a proper earthing pit. It stops a fault becoming a fire.
An array nobody can safely reach is an array nobody cleans. Dirt costs about a tenth of your output.
Ground-mounted, flat-roof, pitched-roof and pole-mounted structures. Poles, beams and purlins in pre-galvanised or hot-dip galvanised MS; aluminium for tiled and metal roofs. This is the line a discounted quote usually cuts, and the one that fails first.
Interconnect the module array to the inverter, configured to the series-parallel layout of the specific array. Customised for the site rather than bought off a shelf.
Combine inverter outputs into the main service or load panel, with the over-current and surge protection that stops a fault becoming a fire.
A combiner box that also monitors each string individually, so a failing string is diagnosable rather than merely suspected. Worth it on any array large enough that walking it is impractical.
TUV-certified DC cable to EN 50618:2014. Tinned flexible copper with halogen-free, UV-resistant, flame-retardant sheathing — it spends 25 years on a roof in the sun.
Copper-bonded earth rods with chemical backfill, and multi-spike lightning arrestors. Invisible on a quotation and decisive in a storm.
Single-contact weatherproof connectors for module interconnection — the standard, and the only thing that should be used.
Safe maintenance access across an industrial array. An array nobody can safely reach is an array nobody cleans, and a dirty array quietly loses you a tenth of its generation.
The cost breakdown shows this category as a share of a full rooftop install.
