Good morning everyone,
I wanted to ask what your house’s electricity consumption is at night when everything is quiet and sleeping, so what is running continuously?
We have a newly built house, moved in summer 2019. Our building services include underfloor heating (air-to-water heat pump), controlled mechanical ventilation (runs at full power 3 times a day for 2 hours each, then reduced), a photovoltaic system, and otherwise the usual nighttime appliances (phone charger plugged into USB outlet, e-bikes charging occasionally, 2 TVs on standby, Alexas on standby, etc.).
At night, we have a continuous consumption of about 232W (with ventilation running at reduced power and when the heat pump is not producing). I can see this in the app for the photovoltaic system. From 0:00 to 6:30 a.m. we consume about 2.8 kWh.
How about you?
Best regards
I wanted to ask what your house’s electricity consumption is at night when everything is quiet and sleeping, so what is running continuously?
We have a newly built house, moved in summer 2019. Our building services include underfloor heating (air-to-water heat pump), controlled mechanical ventilation (runs at full power 3 times a day for 2 hours each, then reduced), a photovoltaic system, and otherwise the usual nighttime appliances (phone charger plugged into USB outlet, e-bikes charging occasionally, 2 TVs on standby, Alexas on standby, etc.).
At night, we have a continuous consumption of about 232W (with ventilation running at reduced power and when the heat pump is not producing). I can see this in the app for the photovoltaic system. From 0:00 to 6:30 a.m. we consume about 2.8 kWh.
How about you?
Best regards
Ybias78 schrieb:
You should get a photovoltaic system. It’s definitely worth it.I tend to agree. Or consider an energy audit; you can easily save around 30% while maintaining the same quality of life. There’s no need to throw money away, and it’s also good for the environment.Dogma schrieb:
Our annual consumption is about 11,000 kWh. The household consists of 4 people, controlled residential ventilation (runs 24/7), split air conditioning (also runs 24/7 in summer), home automation + energy recovery ventilation, server cabinet (1 data server [24/7], telephone system, router + modems, etc.), garden pumps, garden lighting, and much more.
Is the consumption very high? Yes... but I don’t care, I allow this for myself/us (we don’t smoke or drink for that). The listed devices are not sufficient to explain the 11,000 kWh. Or did you forget to mention the heat pump in your list?
Otherwise, it’s hard to explain in my opinion.
Ybias78 schrieb:
You should get a photovoltaic system. It’s definitely worth it. Basically, I agree with you. But don’t solar panels lose efficiency year by year?
Because of that, it might never really pay off. I don’t know how many kWp I can fit on the roof, but if we assume 10 kWp, how much output do you actually get after the inverter? Let’s say 8.5 kWh in the first year (is that even correct?).
With 11 MWh (11,000 kWh) per year, that’s roughly 1.25 kWh, let’s say 2 kWh since most consumption happens in summer but also the highest photovoltaic generation (we’re just calculating maximum generation regardless of how many days there actually would be).
- What do I do with the remaining 6.5 kWh? Batteries have always been too expensive to make it worthwhile.
- What does the system cost, 10 to 15k€ (without battery)? If I calculate 12k€ and divide by 3k€, it would take 4 years to pay off, if it weren’t for degradation, winter, and bad days that I have deliberately left out here. So I’m assuming 6 to 8 years.
- When should photovoltaic modules be replaced?
These were just some quick thoughts I had. I might be completely wrong. My photovoltaic information is already a few years old, and I haven’t really kept up with it since then.
guckuck2 schrieb:
The mentioned appliances don’t account for the 11,000 kWh. Or did you forget to include the heat pump in your list? Otherwise, I don’t really see any explanation, in my opinion. No, I don’t have a heat pump. The heating is gas-based. I believe the number because I see it on my annual bill. The technical equipment alone already consumes quite a lot. The server cabinet alone, I think, uses about 350 Wh. The control cabinet with the controller uses around 120 Wh even without any other appliances (apart from the controller), so almost 40% is gone already, and I haven’t even included air conditioning, lighting, cooking, etc. for the whole year.
Dogma schrieb:
Basically, I agree with you. But don’t solar panels degrade in performance year after year?
So it might never really pay off. I’m not sure how many kWp I can fit on the roof, but if we assume 10 kWp, how much energy would come out after the inverter? Let’s say 8.5 kWh in the first year (is that even correct?).
With 11 MWh (11,000 kWh) per year. That’s roughly 1.25 kWh, let’s say 2 kWh since most consumption happens in summer, which is also when most photovoltaic generation occurs (we’ll just assume maximum production regardless of how many days that really applies to).
- What do I do with the remaining 6.5 kWh? Batteries have always been too expensive upfront to be worthwhile.
- How much does a system cost, 10,000 to 15,000 € (without battery)? If I calculate 12,000 € and divide by 3,000 €, I get 4 years until break-even, if it weren’t for degradation, winter, and cloudy days that I have deliberately left out. So realistically, I’m estimating 6 to 8 years.
- When should photovoltaic modules be replaced?
These were just some quick thoughts I had. I could very well be wrong. My photovoltaic knowledge is also a few years old and I haven’t looked into it since. You have a warranty that guarantees the panels will produce a certain kW output for x years.
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