What's your monthly SCOP

michaels

Spies said:

As long as you don't charge for more than 6 hours total, yes.

Is your charger not IOG compatible?

Which charger

Can certainly limit myself to 6 hours on the IOG compatible charger in the day and then 6 hours overnight on the V2H charger and of course the granny charger at either of those times

Strummer22

GSHP. In Jan we generated about 4,100 kWh of heat with a SCOP of 4.3, using about 1,000 kWh of electricity. January is almost always our highest energy usage month. 

The cold spell early in the month really hit consumption. The high heat demand in this period (plus cold weather) dropped the incoming brine temp to below 4°C. The reduced source temp thereafter has reduced the SCOP. 

Spies

Feb was 2.99 for heating and 2.11 for water (turned immersion boost off)

May update with more detail later, but as before, inaccuracies due to taking readings from the MMI so true figures are likely lower

NedS

SCOP for February is 3.61 including pumps/controller etc, or 4.06 for just the heat pump (useful for comparison with oil/gas, which also incur electrical costs for pumps/controller etc).

Electrical usage (MID meter) for the heat pump alone was 449.20kWh, total house usage was 626.76kWh at an import cost of £122.65 (average 19.6p, Octopus Cosy tariff)

Heat produced was 1824.3kWh, which would have cost £132.57 for a gas boiler at the current price cap, assuming a boiler efficiency of 90% That's more than our whole house electricity bill including heating and hot water.

Even at the Ofgem price cap of around 25p per kWh, a COP of 4 beats the price of oil/gas. If you can reduce your electricity unit costs using TOU or heat pump tariffs, then significant savings are possible.

Again, I'm really happy with my SCOP over the winter, and that we've made significant savings over our previous running costs.

michaels

My COP/SCOP remains a work in progress as I don't believe the heat meter I installed (out reads 1.5c lower than in when the circulation pump is running and the heat pump is off when according to the heat pump out and in are the same) but I think I got a SCOP of about 2.5 in Jan and Feb by my calcs - sounds poor but undersized rads and pipes mean I have to a second circ pump and flow temps at 50C plus when the outside temp is below freezing which it was for a lot of Jan and the first half of Feb.  (note heating only)

However my average cost per unit of electricity with the V2h battery is below 9p so the cost per unit of heat is still well below the cost of gas so no complaints.

Spies

March stats

379kWh electricity used for 1356kWh of heating = 3.58

76kWh of electricity for 170kWh of hot water = 2.24

Managing to use a lot more of my own generation this year, last March I used 38% of 245kWh, this March I've used 57% of 320kWh and the only difference is the heatpump really

NedS

March monthly usage was 258kW for 1137kW of heat and hot water, COP of 4.40. Average price per kWh generated was 3.9p so substantially cheaper than gas.

We managed to use 48% of our solar generation and have been able to run the heat pump on solar for much of the month during sunny days (solar in March has been exceptional).

We had our ASHP and solar (3.645kWp) installed last June, and now winter is well and truly over I can say with certainty that our solar generation will easily exceed our heat pump usage for the year, so we are running on sunshine, and don't it feel good!

FreeBear

NedS said: and now winter is well and truly over

If you read the Mirror, they claim we are in for another Beast from the East later in the month. Met Office makes no mention of the impending doom.. Even so, it isn't that unusual to get frosts in April.

Strummer22

GSHP, 2.3MWh heat generated at overall SCOP of 4.9, using about 470 kWh of electricity.

Although I don't have solar (yet - ask again in about 2027!), the exceptional amount of sunshine we received in March provided plenty of solar gain. At this time of year, if it's sunny I can basically turn the heating off regardless of the temperature outside. 

It's a somewhat drafty farmhouse, so on the chilly days with no sun we chew through 30 kWh of electricity, hence comparatively high consumption despite the generally benign weather. 

NedS

FreeBear said:

NedS said: and now winter is well and truly over

If you read the Mirror, they claim we are in for another Beast from the East later in the month. Met Office makes no mention of the impending doom.. Even so, it isn't that unusual to get frosts in April.

Accepted, but even if it turns cold again, we should still generate more in April than the heat pump consumes (and with May and half of June still to come), hence my certainty that we will generate more than the ASHP consumes annually.