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Module versus balance of system lifecycle emissions for urban rooftop and carport photovoltaic systems in São Paulo, Brazil

モジュールとシステムバランスのライフサイクル排出量：ブラジル・サンパウロにおける都市の屋上およびカーポート太陽光発電システムについて (AI 翻訳)

Carolina Mônica dos Santos, Sérgio Almeida Pacca

Academia Engineering📚 査読済 / ジャーナル2026-04-23#再生可能エネルギー
DOI: 10.20935/acadeng8259
原典: https://doi.org/10.20935/acadeng8259

🤖 gxceed AI 要約

日本語

ブラジル・サンパウロの屋上およびカーポート太陽光発電システムのライフサイクル温室効果ガス排出量を評価。カーポートシステムはバランス・オブ・システム（BOS）の排出量が高く、全体の排出原単位は屋上よりも大きい。モジュール製造の寄与も大きく、アルミニウム調達の低炭素化が重要。

English

This study evaluates the lifecycle GHG emissions of rooftop and carport PV systems in São Paulo, Brazil. The carport system has higher emissions per kWh (18 gCO2e/kWh) than rooftop systems (13 gCO2e/kWh) due to its balance of system (BOS). Module manufacturing and aluminum in BOS are major contributors, suggesting low-carbon aluminum procurement.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本の太陽光発電のライフサイクル評価では、BOS排出量が過小評価される傾向がある。本研究は、BOSの排出量がシステム全体に占める割合を示しており、日本でのLCA実施や低炭素資材調達の参考となる。

In the global GX context

This paper provides empirical LCA data for PV systems in a tropical climate, highlighting the importance of balance of system (BOS) emissions. It complements existing studies from temperate regions and offers insights for global procurement strategies, especially for aluminum-intensive structures like carports.

👥 読者別の含意

🔬研究者:Provides lifecycle emissions data for PV in Brazil, useful for comparative LCA studies.

🏢実務担当者:Highlights that BOS emissions, especially from aluminum, can be significant; consider low-carbon materials.

🏛政策担当者:Supports inclusion of BOS in renewable energy carbon footprint regulations and green procurement.

📄 Abstract（原文）

Introduction: Due to Brazil’s geographic location, the country is well-positioned to generate energy from renewable sources. With high levels of solar irradiation, the use of photovoltaic (PV) solar energy has grown in recent years, and installations are expected to continue increasing. Assessing lifecycle greenhouse gas (GHG) emissions associated with installing PV systems is key to determining net emissions reductions and evaluating the potential to reduce the carbon footprint of existing PV systems. Materials and methods: This work evaluates the carbon footprint of two rooftop PV systems and one carport PV system installed in São Paulo, Brazil, considering a 30-year lifetime. The lifecycle assessment (LCA) system boundary encompasses manufacturing, PV module installation, and the balance of systems (BOS). We have collected data from Environmental Product Declarations (EPDs) and PV system installation monitoring. Results: Although the electricity-normalized module emissions for the rooftop and carport systems were 13 and 8 g of CO2-equivalent per kilowatt-hour (gCO2e/kWh), respectively, the carport installation had the highest emissions per unit of energy (18 gCO2e/kWh) because its BOS had the highest emissions (10 gCO2e/kWh). Conclusions: The carbon footprint of rooftop systems was lower than that of the carport system, and BOS emissions were a significant share of the carport’s total. Module manufacturing also contributed significantly, and the carport allows the installation of bifacial modules, which increase electricity generation. Aluminum accounted for a significant share of BOS GHG emissions, so procurement of low-carbon aluminum should be considered.

🔗 Provenance — このレコードを発見したソース

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