> For the complete documentation index, see [llms.txt](https://vc-docs.gitbook.io/engine/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://vc-docs.gitbook.io/engine/home/doxygen_synced/classes/class_p_v_calculations.md).
# PVCalculations
**Usage:** `api.PVCalculations.CalculatePIV(json, ok => {})`
Build and compare PV (solar panel) system models, and read the results of the latest PV curve.
## Public Functions
| | Name |
| ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| string | SystemModelToJSON(EPESerializeData data)
Converts a system model to a JSON string.
|
| string | SystemModelToJSON(Array pvarrays, Array moduleNames, Array ir\_data, Array temp\_data, Array npar, Array nser, bool bypassDiodes)
Builds a system model from arrays and converts it to a JSON string. Each array is indexed \[array]\[module] and all must have matching shapes.
|
| int | [**CalculatePIV**](https://git.unimetaverse.net/vc-core-engine/doxygen/-/tree/main/Classes/Classes/class_p_v_calculations.md#function-calculatepiv)(string json, Action< bool > onCompleted) |
## Public Attributes
| | Name |
| ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| List< float > | I\_Data
Current (I) values of the most recently calculated curve.
|
| List< float > | V\_Data
Voltage (V) values of the most recently calculated curve.
|
| List< float > | P\_Data
Power (P) values of the most recently calculated curve.
|
| int | MPPTIndex
Index of the maximum-power point in the most recent curve.
|
## Public Functions Documentation
### function SystemModelToJSON
```csharp
static string SystemModelToJSON(
EPESerializeData data
)
```
Converts a system model to a JSON string.
**Parameters**:
* **data** The model to convert.
**Return**: The model as JSON.
```csharp
static string SystemModelToJSON(
Array pvarrays,
Array moduleNames,
Array ir_data,
Array temp_data,
Array npar,
Array nser,
bool bypassDiodes
)
```
Builds a system model from arrays and converts it to a JSON string. Each array is indexed \[array]\[module] and all must have matching shapes.
**Parameters**:
* **pvarrays** PV-array identifiers.
* **moduleNames** Module names.
* **ir\_data** Irradiance values.
* **temp\_data** Temperature values.
* **npar** Parallel-string counts.
* **nser** Series-string counts.
* **bypassDiodes** Whether bypass diodes are enabled.
**Return**: The model as JSON.
### function CalculatePIV
```csharp
static int CalculatePIV(
string json,
Action< bool > onCompleted
)
```
## Public Attributes Documentation
### variable I\_Data
```csharp
static List< float > I_Data;
```
Current (I) values of the most recently calculated curve.
### variable V\_Data
```csharp
static List< float > V_Data;
```
Voltage (V) values of the most recently calculated curve.
### variable P\_Data
```csharp
static List< float > P_Data;
```
Power (P) values of the most recently calculated curve.
### variable MPPTIndex
```csharp
static int MPPTIndex;
```
Index of the maximum-power point in the most recent curve.
***
Updated on 2026-07-22 at 12:00:00 +0800