Step 2 - Electricity Usage

Electricity Usage Enter your annual electricity use, excluding any electric vehicle charging (in kWh):

I have a heat pump, and this value includes its usage.

I have (or expect to have) a heat pump, but this value does not include its usage.

I do not have (or expect to have) a heat pump.

Note: if you have solar PV installed already, look at the usage on your electricity bill, and add back any usage (kWh) you think is being met by solar.

To determine your electricity usage profile, please select the option that best describes the premises where the system would be installed:

Select whether you have a single-phase or three-phase electricity supply:

Heat Pump Usage Select whether your heat pump is air-source or ground-source:

Do you know the rating (thermal output) of your heat pump (in kW)?

Yes

Enter the rating (thermal output) of your heat pump (in kW):

Select the option that best describes the building containing the heat pump:

Enter the floor area of the building (in square metres):

Use square metres.

Use square feet.

Enter the number of occupants (full-time residents): Select the rough geographic location of the building:

Electric Vehicles

One of the benefits of battery storage is that it allows you to switch to a time-of-use (or peak / off-peak) tariff and to negate the peak tariff by charging the battery at the off-peak rate (night) and discharging it during the peak rate.

You can then charge your electric car(s) overnight at the off-peak rate. Our calculator allows you to model this benefit. If you have, or plan to have, any electric vehicles, add them below:

First Vehicle:

Vehicle No.

Select a vehicle type from the list, or select custom:

Enter battery size of vehicle (in kWh):

Enter efficiency of vehicle (in miles per kWh):

Enter average distance driven per day (in miles):

× Warning: you have indicated that the total kWh charged to the car in a day exceeds its battery rating. This can only be correct if you charge the car fully (from zero) more than once a day on average.

Second Vehicle:

Vehicle No.

Select a vehicle type from the list, or select custom:

Enter battery size of vehicle (in kWh):

Enter efficiency of vehicle (in miles per kWh):

Enter average distance driven per day (in miles):

Third Vehicle:

Vehicle No.

Select a vehicle type from the list, or select custom:

Enter battery size of vehicle (in kWh):

Enter efficiency of vehicle (in miles per kWh):

Enter average distance driven per day (in miles):

Step 2 - Electricity Usage

Help

How do I know what my annual electricity usage is?

Help

How do I know whether I have single-phase or three-phase?

Help

How many people live in the building?

First Vehicle:

Vehicle No.

Second Vehicle:

Vehicle No.

Third Vehicle:

Vehicle No.