---
title: "Transformers and grid connection"
slug: "transformers"
description: "Learn to add and configure inverter and power transformers in your design, adjusting parameters for optimal performance and grid connection."
updated: 2026-03-26T08:05:04Z
published: 2026-03-26T08:05:04Z
canonical: "kb.solargis.com/transformers"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.solargis.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Transformers and grid connection

**In this document**

You will learn how to add new inverter and power transformers to the design and configure their available parameters.

## Adding transformers to the project

If your installation requires an **additional inverter transformer** or **power transformer**, you can add them manually to the design in the **System design section**.

1. Open the **three-dot menu.**
2. Select the **transformer type**you want to create.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(973).png)

After you create the transformer, it will be added to the system design, and its properties will show on the panel to the right. Once you connect it to the system, it will also be included in the simulation calculations.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(974).png)

### General transformer settings

| Available settings | - Position - Safe zone |
| --- | --- |

The general section lets you adjust the transformer’s **position** and **safe zone**. To change its position:

1. **Select the transformer** in the main menu.
2. Activate the **move tool** on the **3D map.**
3. Move the transformer around with the mouse by **clicking and holding** the square that surrounds it.
4. Save the position by pressing **“Enter”.**

> **Tip**: You can also change its position manually by entering its GPS coordinates.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(975).png)

## Transformer connection parameters

| Available settings | - Output voltage |
| --- | --- |

The **connection parameters** section lets you change the default **transformer output voltage**. Switch to **manual**and enter the transformer's actual voltage output if that is required.

#### Adaptive connection

If the Inverter Transformer is the **last component connected** to the grid connection, its output voltage is **adapted**to that voltage.

> [!TIP]
> **Note**: If the grid connection voltage is **above 35kV**, a power transformer is automatically added to bridge that voltage gap. In this case, the Inverter transformer will adapt to automatically determined power transformer input voltage.

> [!WARNING]
> **Important**: Grid connection voltage **does not influence simulation**. It is used only to automatically add/remove power transformers and set output voltages for inverters/power transformers.

#### ![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(226).png)

## Transformer losses

| Available settings | - Losses model - Power rating - No load losses - Load losses - Transformer class (Constant losses) |
| --- | --- |

Losses can be set to **variable**or **constant**. Each option has its configurable parameters.

#### Variable losses settings

You can change the default loss values according to the transformer parameters used in the installation:

- **Power rating** - select between adaptive rating, manual rating, and apparent rated power.
- **No load losses** - enter no-load losses value in kW.
- **Load losses** - enter transformer load losses value in kW.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(230).png)

| Power rating setting | Description |
| --- | --- |
| Adaptive rating | Based on the system size, Solargis Evaluate automatically selects the appropriate size of the transformer from a set of predefined transformer ratings. The losses are predefined for each transformer, and can be adjusted. |
| Manual rating | Select rating from the set of predefined transformer ratings with predefined losses. The losses can be adjusted. |
| Apparent rated power | Specify the apparent rated power of the transformer. The losses are set automatically based on your inputs, and can be adjusted. |

#### Constant losses settings

If you are aware of the transformer class used in the installation, you can switch to the **constant losses** **model** and apply the losses based on the transformer class rating.

- **Transformer class** - select between the standard transformer, high-efficiency transformer, and custom losses.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(231).png)

| Transformer class setting | Description |
| --- | --- |
| Standard transformer | Configured for typical efficiency, suitable for general applications |
| High-efficiency transformer | Designed to reduce losses at a higher initial cost, ideal for energy-saving applications |
| Custom losses | Allows tailoring of the transformer’s performance characteristics to meet specific operational requirements |

## The grid connection

The energy system designer offers three types of grid connection:

- **underground,**
- **pole,**
- and **station**.

**Pole**and **station**graphics are offered for better visualization and perception of its space occupation. Additionally, you can adjust the **connection’s position** and customize the **connection point parameters.**

1. **Enter the coordinates** if you know the exact position of the grid connection point and select its type.
2. Alternatively, use the 3D map **move tool** to move the grid connection point around the map.
3. Configure the connection parameters (number of AC phases, frequency, voltage, power factor, and power limit).

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image-6UT27JJ6.png)

## Interconnecting inverter setups, transformers, and the grid

### Inverter setup connections

You can customize the connection of your arrays, inverter, and power transformers to achieve the required connection scheme by following these steps:

1. Connect **the inverter setups** to the required **inverter transformers**.
2. Connect **the inverter transformers** to the **power transformers**.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(100).png)

> [!TIP]
> **Note**: In example above, scenario allowed only **one power** and **one inverter** **transformer**with all arrays connected to it. The **inverter transformer 2**and **inverter setup B** can be **deleted**.

| Connection parameter | Description |
| --- | --- |
| Power factor (cos phi) | Indicates the efficiency of power usage, showing the ratio of real power to apparent power in the system. |
| Power limit | Sets the maximum active power that can be exported to the grid from the inverter. |
| Number of AC phases | Specifies how many alternating current phases are used in the system. |
| Voltage | Defines the nominal voltage level at which the system operates. |

### Inverter transformers and power transformer connections

You can connect your inverter transformers to **power transformers** by following these steps:

1. Select **inverter transformer** in system design section of main navigation menu.
2. Select new **power transformer** in electrical layout section. Your inverter transformer will be connected and added to power transformer.

> [!WARNING]
> **Important**: All inverter transformers connected to one power transformer must have the same output voltage.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image(976).png)

> [!TIP]
> **Note**: Alternatively, use the **three-dot menu of the inverter transformers**, select Reconnect, and choose a power transformer to connect it to.

### Connections to the grid

Power transformers are connected to the grid automatically, as they are the biggest power source for the power plant after the grid connection. You can bypass the power transformer and connect any of the inverter transformers to the grid directly.

1. Click the **three-dot menu** of the inverter ptransformer.
2. Select **Reconnect**and select where you want to connect it.

![](https://cdn.document360.io/ae2d502f-6c0d-4865-a68e-43ad8da61149/Images/Documentation/image-7A1PLB52.png)