Special loads
These are loads with their own schedule that are added to the base consumption (typical or real). Use them to assess an electric vehicle or a heat pump that the client already has or plans to install.
Electric vehicle
The annual energy (km × consumption) is spread over the chosen charging hours, at the power of the charging point.
| Parameter | Example |
|---|---|
| Kilometres per year | 12.000 |
| Consumption (kWh/100 km) | 16 |
| Charging point power (kW) | 3,7 |
| Schedule | Night, midday, afternoon or free |
| Days | Every day or weekdays only |
The schedule is key: charging at midday uses the solar production; charging at night barely uses it (unless there is a battery).
Heat pump
The thermal demand for heating and cooling is distributed according to the degree-hours of the temperature in the weather year and converted into electricity using the efficiency.
| Parameter | Default | Meaning |
|---|---|---|
| Heating demand (thermal kWh/year) | – | Thermal energy the home needs |
| COP | 3,5 | Heating efficiency |
| Cooling demand (thermal kWh/year) | 0 | Cooling energy |
| EER | 3,0 | Cooling efficiency |
| Heating base temperature | 15 °C | Below it, there is heating demand |
| Cooling base temperature | 24 °C | Above it, there is cooling demand |
The electricity consumption is the thermal demand divided by the COP or EER, distributed over the hours when the outdoor temperature requires it. That is why it needs the weather year for the location.
Charts
The total curve with the added loads is shown in step 3, broken down into base consumption, vehicle and heat pump.
Do not count consumption twice
If the client's real curve already includes the vehicle or the heat pump, do not add them again as a special load.