Adjusting SAP from BC to the as built version with 6.8 kW of PV

[Susie]

Does anybody have a SAP with 6.8kW PV and can tell me the dwelling generation and units used and exported figures

Or

A build of 110m2 who can tell me their notional generation figures and units used.

 

 

Reason

 

I’m not sure I am going to have the funds at watertight shell stage to put as much PV ‘in’ the roof as I wanted to in the SAP completed by the architect. We are no longer with the architect and he has refunded me the SAP costs so I can not ask him for help.

 

My PV calcs show that 6.8kW would be a good amount of PV for my usage but the architect put 11.7 kW in the SAP for BC and that’s too much and too expensive.  I could pay to have another SAP calculation but this will be a very slow ‘build as you earn’ once watertight.  No other SAP elements should change but as this is showing who knows what will happen as the build progresses.

 

The PV is fed into the calculations for TER and  TPER

The notional figure for PV is calculated as 40% of the build area divided by 6.5.

So for me 135m2 x 40% / 6.5 is 8.3kWp which has a PV generation of 6672.7132

With 1586 units used in the dwelling and 5085 exported.

The generation figure is not based on my property like a MCS calculation so I think it is more general may be a notional location and possibly no account for ‘in or out all day’.

 

From the generation figures I can calculate the TER and TPER for my as built SAP to see if I still get a pass with less PV

 

My target TER is 8.41kgCo2/m2 and my dwelling is negative 2.5kgCO2/m2 and TPER target is 46.33 kWh and the dwelling is 25.54kWh so I should have some wriggle room.

 

Or any build hub member looking for a client for a Part L SAP for a house that will not be completed for years.