In brief. A "solar plant design" is the set of documentation by which the plant can be manufactured, installed, agreed with the grid operator and safely operated. Below: which sheets such a set consists of, how to read the main one (the single-line diagram), and real examples of our typical solutions in PDF that you can open and look through.

What the design set consists of

The scope depends on the plant's capacity and the connection method, but the backbone is the same:

Explanatory note — input data, the decisions taken, the calculations.
Single-line diagram — the main sheet of the electrical part: how the plant is connected and how it is protected.
Layout drawings — the module layout on the roof or the site, the locations of the inverters, switchboards, packaged transformer substations.
Cable schedule and routes — cross-sections, lengths, laying methods.
Earthing and lightning protection.
Equipment specifications — the specific modules, inverters, protective devices, switchboards.
Switchgear and packaged transformer substation drawings — the documents by which the equipment is actually manufactured at the factory.
Relay protection and automation — for plants with a power evacuation line into the operator's grid.

The full list of documents and permits (who needs TU and who does not) we covered separately: "Industrial Solar Plant Design: what it includes and which documents are required".

The main sheet: how to read a solar plant's single-line diagram

The single-line diagram is the "route" of the electricity from the module to the connection point. It reads left to right:

Photovoltaic modules, connected into strings — direct current.
DC-side protection and switching — fuses, disconnectors, surge protective devices.
Inverter — DC→AC conversion; the protective functions live here too, in particular anti-islanding protection.
Switchboard / 0.4 kV switchgear — the AC assembly, circuit breakers, generation metering.
Transformer and packaged transformer substation — for large plants: stepping the voltage up from 0.4 to 6/10 kV.
6/10 kV switchgear — cells, protection, measurement.
Connection point — the boundary with the distribution system operator's grid; this is also where the bidirectional commercial metering sits.

It is precisely on this sheet that the engineer's level shows: whether the protection settings are coordinated, whether the devices are correctly selected, whether the diagram matches the plant's actual operating mode.

Examples: real LK typical solutions in PDF

These are anonymised typical solutions from our library — not the designs of specific customers. We do not publish the design documentation of completed sites: it contains client and site data (commercial secrets). But a typical solution shows the same engineering logic.

Typical solution: a packaged transformer substation and 6 kV switchgear for a solar power plant (1 MW block) — how the power evacuation of a solar plant is organised through packaged block substations.

What you can open:

Single-line diagram of the 6 kV switchgear — LK-KTP-SES-OL-KRP-6kV.pdf
Single-line diagram of the 6 kV switchgear assembly — LK-KTP-SES-OL-RU-6.pdf
Single-line diagram of the 0.4 kV switchgear — LK-KTP-SES-OL-RU-04.pdf

→ View and download: the typical solution page /lk/proektuvalnykam/typove-rishennia-ktp-ses (it also carries the technical parameters, the contents of the set and sheet previews). → The DWG set for designers — on request from the solution page.

The whole library of typical solutions (switchboards, packaged transformer substations, automatic transfer switches, switchgear) is in the "For Designers" section.

What "a solar plant design from the internet" will not give you

A downloaded sample is useful for understanding the logic and the contents of the set. But it will not become your design, because by definition it does not contain:

your consumption profile — and it is against that profile that the plant's capacity is calculated;
your connection parameters — the permitted (contracted) capacity, the incoming voltage class, the condition of the incoming switchboard;
your site — the load-bearing capacity of the roof, shading, the orientation of the slopes, the geology for the piles;
the grid operator's current requirements for your site.

That is why we use typical solutions as proven building blocks (packaged transformer substations, switchboard assemblies), while the capacity, the connection scheme and the protection set are calculated for the specific site.

A typical or an individual solution

Typical — faster and cheaper when the site fits a standard configuration: proven building blocks, ready-made diagrams, predictable switchboard manufacturing terms. Individual — when there are non-standard constraints: a complex roof, a limited area, special operator requirements, a specific production regime.

In practice the working option is almost always a hybrid: typical building blocks + an individual fit to the site.

What we need in order to calculate your design

Capacity or the site area · site type (roof / ground) · your consumption schedule or volume · the permitted (contracted) capacity of the site · the incoming voltage class.

→ Order a design or a calculation for your site.

Frequently asked questions

Can I download a sample solar plant design in PDF? Yes — we publish anonymised typical solutions: single-line diagrams of the 6 kV switchgear, the 6 kV switchgear assembly and the 0.4 kV switchgear for a 1 MW solar plant block. We do not publish the design documentation of specific customers. For designers, a DWG set is also available on request.

What does a solar power plant design include? An explanatory note, a single-line diagram, layout drawings, a cable schedule, earthing and lightning protection, specifications, switchgear and packaged transformer substation drawings; for plants with a power evacuation line — a relay protection section. The scope scales with capacity.

Will a typical solar plant design suit my site? The typical building blocks — yes (packaged transformer substations, switchboard assemblies). But the capacity, the connection scheme and the protection set are calculated for the specific site: for your consumption profile and your connection parameters.

Who develops a solar plant design? Electrical designers together with the plant's engineers. At LK Energy, design, switchgear manufacturing, installation and grid connection are carried out within a single company.

Solar Power Plant Design: What It Actually Looks Like (with PDF Examples)