My running costs v passive or similar house

macgabhs

Is there any interest in reviving this thread?

I am in my new build about 9 months now. It is not a passive house so mods feel free to move this post to a separate thread if you wish. It is a 270m2 house with A2W heat pump as the only heating and DHW source, MHRV & 2Kw PV array. I have been tracking my energy usage since we moved in. The chart attached shows the average day and night usage based on readings from my ESB meter.

Currently showing a steady 6kWh during the day and 4kWh at night but the heating is off and only DHW is on. I'm fairly happy with the running cost but am really interested in knowing how I am comparing to other similar spec houses.

Cheers

Steve

air

macgabhs wrote: »

Is there any interest in reviving this thread?

I am in my new build about 9 months now. It is not a passive house so mods feel free to move this post to a separate thread if you wish. It is a 270m2 house with A2W heat pump as the only heating and DHW source, MHRV & 2Kw PV array. I have been tracking my energy usage since we moved in. The chart attached shows the average day and night usage based on readings from my ESB meter.

Currently showing a steady 6kWh during the day and 4kWh at night but the heating is off and only DHW is on. I'm fairly happy with the running cost but am really interested in knowing how I am comparing to other similar spec houses.

Cheers

Steve

Seems excellent for such a huge house but you should invest in an energy monitor, hard to do much with that few data points.

macgabhs

I have an open energy monitor installed for the past week which gives me realtime monitoring of PV generation, whole house demand and how much pv is being used/exported. It's too soon really to tell anything much from the data so would like to get a feel for what's typical in terms of electricity usage in a modern well insulated house with a heat pump. Next step is to try and adjust our usage to maximise the use of self generated electricity. Or decide if we should just be running things at night.

Calahonda52

total kWH for the period of occupancy divided by the area and grossed up fro a full year will give you a number which you can compare with a BER Cert rating, any other "similar" comparisons is not useful unless you know the occupancy and HW load and appliance load.

re: used/exported
are you exporting back to grid?

Metric Tensor

It would help contextualise the figure OP if you included a few more details about occupancy.

How many people live in the house and are you there all day or is the house empty on weekdays between 8 and 6.

For example the energy usage for a retired couple would be completely to that of a young family of five in the exact same house.

ht9zni1gs28crp

macgabhs wrote: »

I have an open energy monitor installed for the past week which gives me realtime monitoring of PV generation, whole house demand and how much pv is being used/exported. It's too soon really to tell anything much from the data so would like to get a feel for what's typical in terms of electricity usage in a modern well insulated house with a heat pump. Next step is to try and adjust our usage to maximise the use of self generated electricity. Or decide if we should just be running things at night.

Id love to know how your getting on with the Open Energy Monitor, I nearly bought last year but just wasnt 100% sure on the system I needed and its set up. I still havent a real time system in place as I couldnt find anything equal or better on the market.....

PM me if you prefer to save hijacking this thread.

Thanks

macgabhs

It's a two adult one child house that is unoccupied Monday to Friday 8-5. I understand what you mean on the kWh/m2/y figure for comparisons. Mines working out at 34kWh/m2/y when the current usage over 9 months is projected forward. However I'm more interested in real world figures than what's on a BER cert so perhaps if anybody wishes to reply with similar figures the following info is worth quoting (filled in with my data)

Floor area - 270m2
Heating - A2W
Supplementary heating - none
Ventilation - MHRV
Occupants - 2 adults 1 kid house empty mon to Friday 8-5
Renewable sources - 2kw solar pv
Measured energy use - 34kWh/m2/y (extrapolated from 9 months data)

On the solar pv what I mean by exported is unused energy given back to the grid for free.

So far I'm finding the open energy monitor very good. It was fiddly to install as the clamps need to go in a very tight space but didn't take very long. Once it's setup it's very nice to use and there are loads of customisable settings to suit what you want so hours of fun ahead tinkering with it. Most obvious thing that it has highlighted so far is that cooking is heavy on electricity!