{"id":49809,"date":"2026-03-15T17:33:41","date_gmt":"2026-03-15T14:33:41","guid":{"rendered":"https:\/\/isotec.com.tr\/?p=49809"},"modified":"2026-03-15T17:43:10","modified_gmt":"2026-03-15T14:43:10","slug":"is-solar-mounting-system-engineering-or-tonnage","status":"publish","type":"post","link":"https:\/\/isotec.com.tr\/eng\/is-solar-mounting-system-engineering-or-tonnage\/","title":{"rendered":"1 MW Solar Power Plant: Engineering or Tonnage?"},"content":{"rendered":"

Same Power Plant, Two Different Quotes<\/h2>\n

Imagine you receive two quotes for a 1 MW solar power plant. One proposes a 30-ton steel mounting system, the other a 48-ton system. Both are priced similarly. Which one would you choose?<\/p>\n

Most investors think, "48 tons should be stronger." But in engineering, more material doesn't always mean better. In fact, sometimes it shows the opposite: inadequate engineering.<\/strong><\/p>\n

This article explains, using technical data, where tonnage discrepancies in solar energy mounting systems come from, the critical errors in calculation methods, and how pricing models mislead investors.<\/p>\n

S450 vs S235: Same Strength, 37% Less Steel<\/h2>\n

The quality of steel used in solar energy installation systems directly determines the overall weight of the structure. Here's a comparison:<\/p>\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nDesign with S235<\/th>\nDesign with S450<\/th>\n<\/tr>\n<\/thead>\n
Yield Strength<\/td>\n235 MPa<\/td>\n450 MPa<\/td>\n<\/tr>\n
Total Steel Per 1 MW<\/td>\n~48 tons<\/td>\n~30 tons<\/td>\n<\/tr>\n
Shipping Cost<\/td>\nHigh<\/td>\n37% lower<\/td>\n<\/tr>\n
Foundation Load<\/td>\nHeavy<\/td>\nLightweight \u2014 lowers foundation costs<\/td>\n<\/tr>\n
Installation Time<\/td>\nLonger<\/td>\nShorter \u2014 lowers labor costs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

In the early years of the sector, for 1 MW 60\u201370 tons of steel<\/strong> were used, whereas today, with proper engineering 30 tons\/MW<\/strong> It's possible. If you're still receiving offers for 48 tons, the question is: Is this additional 18 tons a structural requirement, or a product of the calculation methodology?<\/strong><\/p>\n

The Unseen Danger in SAP2000: Lateral Sprains<\/h2>\n

One of the most critical control points in steel structure design is lateral buckling<\/strong>(Lateral Torsional Buckling \u2014 LTB). Especially in solar mounting systems, purlins are subjected to compression at their upper flanges under wind suction loads and are prone to lateral buckling.<\/p>\n

Where does the problem begin?<\/strong><\/p>\n

In structural analysis programs such as SAP2000, the program assumes the nodes to be laterally braced by default.<\/strong> When a member is divided at intermediate nodes, each sub-segment is treated as a separate unbraced length. This misleads many engineers, because:<\/p>\n

    \n
  • Solar panels do not give the purlins sufficient lateral support<\/strong>. The panel connection only partially restrains one flange; the opposite flange remains free to buckle.<\/li>\n
  • Under wind uplift, the compression flange is left unrestrained \u2014 compared with the design wind, the structure at much lower loads<\/strong> can collapse.<\/li>\n
  • Even if the program says "stress is sufficient," this result is unacceptable if LTB (Low Voltage Testing) is not checked. is not reliable<\/strong>. The user needs to manually define the unbraced lengths according to the actual situation.<\/li>\n<\/ul>\n

    So how is it done correctly?<\/strong><\/p>\n

    To shorten the lateral buckling length, between the profiles sag rod (cross bracing)<\/strong> is added. The cost of a right rod increases by one cross-sectional size of the profile. is much more economical<\/strong> \u2014because a 12-16 mm diameter steel bar is many times cheaper than increasing the profile along the entire purlin. Proper engineering doesn't increase the profile \u2014 it adds lateral support.<\/p>\n

    Instead of conservatively using a Cb (moment modification) factor of 1.0, calculating it according to the actual moment distribution is also part of section optimization. According to AISC 360, Cb=1.0 is the worst-case assumption (constant moment); in actual load distributions, the Cb value varies between 1.14 and 2.27. With the correct Cb value, the same profile can be achieved at the same safety level. longer spans<\/strong> can be spanned.<\/p>\n

    Wind Load Calculation: TS 498 or Eurocode?<\/h2>\n

    Wind load is the most crucial parameter in solar energy installation system design. However, the standard used for its calculation fundamentally changes the outcome.<\/p>\n\n\n\n\n\n\n\n\n\n
    Parameter<\/th>\nTS 498 (Old Turkish Standard)<\/th>\nTS EN 1991-1-4 (Eurocode)<\/th>\n<\/tr>\n<\/thead>\n
    Turbulence Effect<\/td>\nNot calculated<\/td>\nDetailed model with turbulence intensity Iv(z).<\/td>\n<\/tr>\n
    Topography Factor<\/td>\nLimited<\/td>\nHills, slopes, and coastlines are modeled separately.<\/td>\n<\/tr>\n
    Edge\/Corner Region Separation<\/td>\nSimplified<\/td>\nRegional external pressure coefficients (cpe<\/sub>) \u2014 the edge area is up to twice as high as the center.<\/td>\n<\/tr>\n
    Dynamic Effect<\/td>\nIt is neglected<\/td>\nStructural factor cs<\/sub>cd<\/sub> modeled with<\/td>\n<\/tr>\n
    Conclusion<\/td>\nSignificantly lower wind load<\/strong><\/td>\nRealistic and safe.<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Wind load calculated according to TS 498 is based on Eurocode. between 20% and 40%, depending on the configuration<\/strong> It could be lower. In TS 498, velocity pressure is simply calculated using the formula q = v\u00b2\/1600 \u2014 there is no distinction between turbulence intensity, the first mode frequency of the structure, and the regional pressure coefficient. What does this mean? Choosing a thinner profile means a lighter structure and a "cheaper" offer on paper. But in real wind, this structure will start to stress much earlier than it was designed.<\/p>\n

    Low wind load = thin profile = cheap quote. But it is also the first plant to fall in a storm.<\/strong><\/p>\n

    Eurocode is mandatory in Europe. However, in T\u00fcrkiye, projects are still being produced that "pass" using TS 498. Investors only realize the difference when the first serious storm hits.<\/p>\n

    Pricing Model: Selling Steel Like a Sack of Flour<\/h2>\n

    There is a fundamental difference in approach between T\u00fcrkiye and Europe when it comes to pricing solar mounting systems:<\/p>\n

    European standard: $\/kWp (or cents\/Wp)<\/strong><\/p>\n

      \n
    • The price automatically scales up when the panel power increases from 550W to 700W.<\/li>\n
    • The investor directly links the cost of the mounting system to the plant capacity<\/li>\n
    • Quotes for different panel power ratings can be compared<\/li>\n<\/ul>\n

      T\u00fcrkiye practice: $\/ton<\/strong><\/p>\n

        \n
      • The comparison becomes meaningless when the panel power changes.<\/li>\n
      • The tonnage calculated with a 550W panel is not the same as with a 700W panel.<\/li>\n
      • Heavy construction looks less like it's "expensive" and more like it's "purchased a larger quantity."<\/li>\n<\/ul>\n

        Tonnage-based pricing rewards heavy construction<\/strong>. More steel = more sales. By reducing weight through clever engineering, the company ends up selling less in the $\/ton model.<\/p>\n

        kWp-based pricing rewards engineering quality<\/strong>. A company that can achieve the same capacity with less material offers a more competitive bid to the investor.<\/p>\n

        The question is simple: Are you buying a mounting system or steel?<\/strong><\/p>\n

        Conclusion: Engineering Makes a Difference<\/h2>\n

        Choosing a solar mounting system is not a steel purchasing decision. It is an engineering decision.<\/strong>.<\/p>\n

          \n
        • The difference between 30 tons and 48 tons stems from the quality of the materials and the calculation method.<\/li>\n
        • A structure that "passes" SAP2000 without lateral buckling control may be unsafe in the field.<\/li>\n
        • Wind loads calculated using TS 498 may not reflect actual conditions.<\/li>\n
        • Pricing based on tonnage rewards heavy construction \u2014 pricing based on kWp rewards smart engineering.<\/li>\n<\/ul>\n

          Our only question to the investor is: Are you buying engineering services or tonnage?<\/strong><\/p>","protected":false},"excerpt":{"rendered":"

          Where does the difference come from between the 30-ton and 48-ton bids for the same 1 MW solar power plant? SAP2000 calculation deficiencies, TS 498 vs Eurocode wind load comparison, and technical analysis of \u20ba\/ton and \u20ba\/kWp pricing models.<\/p>","protected":false},"author":1,"featured_media":49815,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[124,597],"tags":[],"class_list":["post-49809","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-genel","category-teknik"],"yoast_head":"\n1 MW GES: M\u00fchendislik mi, Tonaj m\u0131? - ISOTEC<\/title>\n<meta name=\"description\" content=\"Ayn\u0131 1 MW g\u00fcne\u015f enerjisi santrali i\u00e7in 30 ton ve 48 ton teklif aras\u0131ndaki fark nereden geliyor? 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SAP2000 calculation deficiencies, TS 498 vs Eurocode wind load comparison, and technical analysis of \u20ba\/ton and \u20ba\/kWp pricing models.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/isotec.com.tr\/eng\/is-solar-mounting-system-engineering-or-tonnage\/","og_locale":"en_US","og_type":"article","og_title":"1 MW GES: M\u00fchendislik mi, Tonaj m\u0131? - ISOTEC","og_description":"Ayn\u0131 1 MW g\u00fcne\u015f enerjisi santrali i\u00e7in 30 ton ve 48 ton teklif aras\u0131ndaki fark nereden geliyor? 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