Importing Load Profiles in Polysun SPT for Accurate Energy System Design

Importing load profiles is an important step in Polysun SPT, enabling the realistic modelling of individual consumption data and the precise design of electrical systems. Polysun SPT requires a specific CSV file format for import. Energy consumption is specified in the first column using a decimal point, and the time interval in seconds can be specified in the second column if desired. This enables load profiles with various time resolutions, such as 15-minute or hourly intervals, to be effortlessly imported and utilised in simulations. This flexible feature helps PV planners and energy system developers precisely match load profiles to actual consumption conditions, thereby improving yield and optimising consumption in the project.

Formatting Load Profile

Please format your load profile as follows:

1. column: Energy consumption (with . as decimal separator)
2. column: Time interval in seconds (optional)

Example (represents a year with 365, resp. 366 days in 15-min resolution)

For a resolution of 15 minutes the result is 35040, resp. 35136 lines.

An example, how it must look in the csv:

Column 1	Column 2
0.4	0
0.3	900
0.5	1800
…	… (top line + 900)
0.4	…
0.2	31535100, resp. 31621500

Consequently, the second column of the last line contains the last second of the year (a year with 365 days contains 31536000 seconds and a year with 366 days contains 31622400 seconds). Since the first row contains the value 0, the last entry is smaller than the number of seconds per year. If you read in a file with only one column, based on the number of rows the time intervals are automatically filled in and displayed in the preview.

Alternatively, an hourly resolution with fewer entries would also be conceivable.

Example (represents a year with 365 days in hourly resolution)

A profile with hourly resolution and 8760 lines is mapped in Polysun SPT as follows:

Column 1	Column 2
0.4	0
0.3	3600
0.5	7200
…	… (top line + 3600)
0.4	…
0.2	31532400