Designing of solar stations

Building a solar park starts with design!

The aim of the project is to ensure maximum productivity from the investment in the solar power plant. In order for the solution to be long-lasting and to maximize the return on money, the foundations and construction of the plant must be well-thought-out from the very beginning, and the fastening devices must be purchased from certified manufacturers. Only on the basis of a correctly designed solution is it possible to clearly indicate the investment for the construction of the plant, the payback period and to guarantee the long-term guaranteed cash flow productivity of the plant. Imagine that you are building a house with no drawings and stones are just being laid – acting this way and assuming that the solution will be good is not sensible!

The design begins with a thorough inspection, during which the main aspects of the design are identified.
  • Mapping how large, reasonable and optimal a solar power plant is possible to design/build considering the company’s energy consumption profile.
  • Roof covering material, roof slope, direction to weather maps, estimated load capacity.
  • It will be determined whether it is more optimal to install the station on the roof or on the ground.
  • Possible connection of the station either directly to a large consumer/device (e.g. refrigeration unit) or to the main panel of a building.
  • Possible installation location of the inverter.
  • The passage of cable routes and the entry of the power cable into the building.

The solar power plant project determines:

  • the location of the station on the territory and in relation to the weather maps
  • power of the station
  • connection to the building’s electrical and automation system
  • the maximum and optimal number of panels to be installed
  • installation features
  • the number of panels in one circuit
  • the mounting solution used
  • production forecast

Based on the project, it is possible to apply for a building permit and a later use permit from the local government. After receiving the use permit, a completed form must be sent to Elektrilevi to receive renewable energy support.

Parts of the project

  • Explanatory memorandum
  • Position plan
  • Structure diagram of the main shield
  • Solar switchboard
  • Wiring diagram of the panels
  • Monitoring system
  • Communication solution
  • Voltage drop calculation
  • Inverter connection diagram
  • Newsletters
  • Maintenance requirements and instructions
  • Economic calculation

Design process of a solar station

Schedule the design process

Site inspection and information gathering 1. week
Pre-presentation of the project 2. week
Project preparation 2. – 3. week
Issuance of technical conditions of Elektrilevi up to 60 days
Preparation of solutions and offers 4. week
Presentation of the project to the client 5. week

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What are the main design and construction errors?

Problem Impact
AC power cables are underdimensioned Fire hazard, voltage drop, decreased income
The formation of shadows is not taken into account (trees, chimneys, ventilation hatches, roof edge, etc.) Lower productivity, non-productive circuits
Too few inverter circuits Lower productivity and financial loss
Too few panels or the distribution of panels in the chain is incorrect Lower productivity, financial losses and the station will be operational significantly later
Low quality manufacturer’s panels Lower productivity, shorter service life, shorter production cycle, risk of fire
The solar station does not need maintenance – WRONG! Fire hazard, lower productivity, risk of plant destruction
Incorrect installation of inverters  Lower efficiency and additional cooling required
Wrong inverter selection Loss of production, low response speed, no after-sales service, solving problems is time and money consuming
Incorrect calculation of wind load  Panels fly off the roof, roof damage, dangerous to people
Incorrectly selected protection devices Protection is applied too early, risk of fire
Wrong cable selection Investment under- or over-dimensioned, installation complexity, risk of circuit breakage, cable damage
Wrong mounting angle Panels fly off the roof, roof damage, dangerous to people, low productivity
Wrong choice of mounting and fastening accessories The panels fly off the roof, the roof is damaged, the roof starts to run through
Non-use of cable trays Risk of mechanical damage to cables, risk of short circuit, dangerous maintenance

Examples of poor quality solutions

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