Performance task

This section may show as ticked and completed already if this information can be pulled from the start of the project. 

A postcode is necessary for performance calculations, since where in the world the system is located determines how much sunlight it will get. If there is no postcode for the location of your system, choose the most local one you can find. 

If you are creating a flat roof system or using quick roof mode, you will also need to input pitch and orientation. Both this and the location data are used to determine the output of the system.  

This section may show as ticked and completed already if the pitch and orientation can be populated from earlier in the project. 

This section will depend on how you have configured your settings and the system you are designing.

• If you have selected for your panels to be automatically allocated, then panel allocation will show as completed
• If you have selected suggest allocation then here you can choose to edit the allocation or select Done to accept the allocation and close the window.
• If you have manual allocation selected then you will need to allocate the panels here. 
  

There are some cases where auto-stringing will not work and manual allocation will be required.

​Read more: How to Manually Allocate Panels. 

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A self-consumption model is available for all users in the Consumption Task. For UK users, this can be provided to customers in addition to the MCS calculation, which is completed here in the performance task. 

This process follows MCS guidelines defined in MCS 032 to predict self-consumption of the generated PV electricity. UK companies installing under MCS will need to provide this calculation when it can be used. 

• Annual electricity consumption of the property
  • The lookup tables for this calculation only permit values between 1500kWh and 6000kWh. Use the consumption task for more detailed consumption calculations or for values that fall outside this range.
  • For the most accurate results use a value from past electricity bills. Where possible, consumption data should be taken before the installation of electric heating / hot water or electric vehicle charging.
• Occupancy archetype
  • Properties that are occupied during the day will typically consume more PV-generated electricity directly. Properties that are empty during the day may benefit more from battery storage that can store PV-generated electricity for later use.
• Proportion of battery used for ancillary services such as backup power or arbitrage
  • If there is a battery on the project, this question will appear. If the entire battery capacity to be used to increase self-consumption, this value will be 0%.
  • The lookup tables for this calculation only permit that the usable capacity is less than 15.1kWh, in this case use the consumption task for more detailed consumption calculations. 
• Is additional self-consumption anticipated?
  • The MCS calculation does not account for consumption arising from "non-typical domestic loads" such as electric space heating, swimming pools, heat pumps, electricity power diverters, electric water heating and electric vehicles.
  • You can enter any figure here, but the calculation assumes that a maximum of 95% of the generated electricity is available for self-consumption so the value in the results table will be capped to the remaining available generation capacity.

​Read more: Differences between MCS and Easy PV self-consumption.

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The performance estimate calculated here is based on the method detailed in MCS 032. See the end of this section for more information on the methodology used for the self-consumption calculation.  

The MCS performance report can be accessed from the forms (and then reports) drop down menu. 

A. Installation data 
This section details the installed capacity, orientation of the system, inclination of the system and the location. These inputs can be adjusted by clicking the pen icon in the top right or by adjusting the panels on the system. 

B. Calculations
Using the installation data and the shading factor, an estimated annual output is calculated. To adjust the shading factor, navigate to the sunpaths diagrams tab. 

C. Estimated PV self-consumption – PV only
The estimated self-consumption for the system with PV only is taken from the MCS lookup tables, depending on the values above and those input in the task. Click the pen icon to adjust these inputs. 

D. Estimated PV self-consumption – with EESS
The estimated self-consumption for the system with PV and battery storage is taken from the MCS lookup tables. This section will not show if there is no battery storage, navigate to the inverter task to include battery storage.

E. Additional benefits from PV and EESS
If additional consumption is anticipated or some of the battery capacity is reserved for ancillary services, that will be detailed here. This section will not show if that is not the case, to edit those inputs click the pen icon in the top right and navigate to the self-consumption tab. 

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Section A details the installed capacity, orientation of the system, inclination of the system and the location. These inputs can be adjusted by clicking the pen icon in the top right. 

In section B, the data in section A is used to estimate the output per kWp for the unshaded array using the NREL's PVWatts calculator. The percentage of output lost from shade is then subtracted from this value. This is then multiplied by the kWp of the input to calculate the estimated generation per input. To adjust the percentage lost, navigate to the sunpaths tab.