Solar photovoltaic application program in commercial buildings

Effectiveness of solar photovoltaic panel installation on commercial buildings

With the adjustment of energy structure and environmental protection policies in Europe and the United States, solar photovoltaic (PV) power generation is more and more widely used in commercial buildings. This program aims to provide a complete set of solar PV power generation solutions for commercial buildings, including program objectives, design and cost, implementation process, risk management, M&A operation, cases and O&M management.

I. Program Objectives and Scope

1. Core Objectives

As a commercial building is a place of high energy consumption of electricity, in order to give the user in the subsequent operation, continue to reduce the cost, can be through the photovoltaic system to reduce the building 30%-50% of the cost of electricity, the annual emission reduction of carbon dioxide 200-500 tons. At the same time to achieve energy self-sufficiency rate of 40%-70%, optimize the green image of enterprises, and comply with the new energy policy of many countries around the world.

2. Scope of application

The applicable places include the roofs of office buildings, shopping centers, hotels and other commercial buildings and parking lots, with the requirement that the usable area of the roof is ≥1000m2 and the load-bearing capacity is ≥30kg/㎡.

Ⅱ.System design and cost analysis

Project	Parameters and description
‌Module Selection	Monocrystalline silicon module efficiency≥21%, power 300W-400W/block, tilt angle 10°-30°optimized light absorption
‌Installed Capacity	250-300 modules can be installed on every 1000 square meters of roof, with a total power of 75-120kW.
‌Construction Cost	Total investment including equipment, installation and grid connection is about 4-6 RMB/W, about 4-6 million RMB for 1MW project.
‌Payback Period	About 5-8 years (static payback period) under government subsidy, IRR can reach 10%-15%.

Ⅲ.Implementation Process

1. Preliminary Preparation

Firstly, the roof of the commercial construction is surveyed, which needs to be tested for structural safety, shadow shading and grid access conditions.
Then the assessment of grid access, and local policies for construction permits, etc.

2. Construction phase

For the safety of the solar PV setup, mounting brackets are first installed on the surface of the building, with preference given to aluminum/galvanized steel brackets with a wind resistance rating of up to 12.

Then the relevant PV modules are used for laying, requiring a spacing of more than 0.5m to ensure ventilation and heat dissipation, and series-parallel matching of the inverter input voltage.

Finally, the electrical connection can be configured with a 100kW centralized inverter and a matching 20kWh energy storage system, where energy storage equipment can be selected according to the user's actual situation.

IV. Risk Management

1. Technical Risk

As the solar PV battery will slowly decay according to the environment, it is recommended to choose a first-tier brand with 25-year warranty and annual decay rate of less than 0.5%, for specific brand types, consult BIRCE SOLAR in China.

As the PV equipment is installed on the building and to be grid-connected, the construction here needs to pay attention to the safety, so it can be mandatory to buy engineering insurance to prevent fall from height and electrical fire and other uncontrollable risks.

2. Policy Risks

Different countries have different preferential policies for solar PV, and the adoption of the “self-generation and self-consumption + surplus power on-grid” mode can reduce the dependence on national electricity.

3. Natural Risks

There may be typhoons or hailstorms near the equator, so you can take out property insurance, and you can also choose the setup of PV modules with a diameter of hailstone larger than 35mm.

V. Grid-connected operation

1. Grid-connected mode

For the electricity demand of commercial places, full grid-connected mode and self-generated self-consumption mode can be selected.

2. Technical requirements

Different countries have different electricity standards, here when purchasing equipment, you need to communicate in detail with the manufacturer's equipment, and when configuring the backflow prevention device and harmonic control equipment, the voltage in different places is different.

Ⅵ.Typical cases

Installation effect of solar photovoltaic panels on a commercial building in Zhenjiang, Jiangsu Province

A shopping center project in Zhenjiang, Jiangsu, China

Building roof area of about 5000 square meters, installed capacity of 300kW, annual power generation of 1.4 million kWh, covering 65% of the shopping mall electricity demand.

Total investment of 1.8 million RMB, annual revenue of 1.12 million RMB (electricity cost saving + subsidy), payback period of 6.2 years.

VII. Operation and Maintenance Management

1. Cleaning cycle:

Specific cleaning cycle, can be adjusted according to the local environment, for example, desert areas more frequently, while the grassland area weeks can be relatively long, about 1 time per quarter, dust loss rate control within 5%.

2. Monitoring system:

Construction configuration of intelligent monitoring platform, real-time tracking of power generation efficiency/fault alarm.

This solar photovoltaic in commercial buildings application program integrated technical feasibility, economic and risk control, can provide reusable photovoltaic implementation path for commercial buildings, the specific parameters need to be combined with the building measured data to further optimize the building, if you have more questions, according to the website on the contact information to communicate with us.