Sorry for the long, long gap since my last post - we’ve been busy applying what we learnt on this project to many others around the UK.

We finally have a year’s worth of data, represented (rather boringly, sorry) in the graph below:

A bit of background about the electricity consumption number:

• it includes all electricity used onsite - i.e. MVHR fans, air source heat pump for heating and hot water when needed and lighting and appliances etc.
• we now have a meter on the MVHR, so will be able to attribute proportion of consumption to that (i.e. ventilation, non-renewable heating and hot water) later this year once we have a full 12 months’ data.
• it assumes 50% of the PV system’s energy was consumed onsite.

The gas is for cooking only.

If we assume that half of the electricity consumed was for lighting and appliances, then the other half was for fans, heating and hot water via the MVHR. Over the 195m2 of (“treated”) floor area, this 2,500 kWh consumption equates to 12.8kWh per m2 per year - this is exactly the same number that we predicted in our PHPP model. Amazing!