# What are the differences between the MCS and Easy PV self-consumption calculations?

There are a few differences between the Easy PV and MCS self-consumption calculations:

<table border="1" id="bkmrk-mcs-%28uk-only%29-easy-p" style="border-collapse: collapse; width: 100%; height: 359.332px; border-width: 1px; border-style: none; background-color: rgb(255, 255, 255);"><colgroup><col style="width: 19.7833%;"></col><col style="width: 40.1639%;"></col><col style="width: 40.0419%;"></col></colgroup><tbody><tr style="height: 30.8949px;"><td style="height: 30.8949px;">  
</td><td class="align-left" style="height: 30.8949px;"> **<span class="corp-pill pill-uk mceNonEditable" style="user-select: none;"><span class="corp-flag material-symbols-rounded">​</span>easy-pv.co.uk</span> MCS**</td><td class="align-left" style="height: 30.8949px;">**Easy PV**</td></tr><tr style="height: 60.8807px;"><td style="height: 60.8807px;">**Easy PV task**</td><td style="height: 60.8807px;">Completed at the end of [Performance task](https://help.easy-pv.co.uk/books/performance-and-consumption/page/performance-task "Performance task"), select `MCS` in [Financial task](https://help.easy-pv.co.uk/books/financial-task/page/using-the-financial-task "Using the Financial task") to use

</td><td style="height: 60.8807px;">Completed in [Consumption task](https://help.easy-pv.co.uk/books/performance-and-consumption/page/getting-started-with-the-consumption-task "Getting started with the Consumption task"), select `Easy PV` in [Financial task](https://help.easy-pv.co.uk/books/financial-task/page/using-the-financial-task "Using the Financial task") to use

</td></tr><tr style="height: 66.8892px;"><td style="height: 66.8892px;">**System size and consumption**</td><td style="height: 66.8892px;">Strict limits:

- Consumption: 1500-6000kWh
- Generation: &lt;6000kWh
- Usable battery capacity: &lt;15.1kWh

</td><td style="height: 66.8892px;">No limits on system size or consumption. Any consumption, generation or battery capacity

</td></tr><tr style="height: 48.892px;"><td style="height: 48.892px;">**Consumption profile**</td><td style="height: 48.892px;">Domestic profiles only: home all day, home half the day and out all day</td><td style="height: 48.892px;">Domestic or commercial consumption profiles. Plus the option to upload half-hourly data from customer

</td></tr><tr style="height: 66.8892px;"><td style="height: 66.8892px;">**Method**</td><td style="height: 66.8892px;">Determines self-consumption based on look-up tables specified in MGD 003, using annual generation and consumption totals</td><td style="height: 66.8892px;">Models how generation is distributed using PVGIS data, then calculates usage minute-by-minute across the entire year.</td></tr><tr style="height: 84.8864px;"><td style="height: 84.8864px;">**Additional options**</td><td style="height: 84.8864px;">Limited since it only compares annual figures and cannot factor in real-time changes.</td><td style="height: 84.8864px;">Minute-by-minute calculation means **export limits**, **inverter clipping**, **variable tariffs** and **forced charging/discharging of batteries** are factored into calculations</td></tr></tbody></table>