ᐅ Photovoltaic System: How Many kWp Are Sufficient for a House?

Zaba12 schrieb:

By the way, the dryer uses 6 kWh

That is extremely high if accurate. Modern heat pump dryers typically use about 1–1.5 kWh per drying cycle.
So saving 5 kWh per cycle at 27 cents per kWh equals a potential saving of €1.35 per drying cycle.
In that case, purchasing a new dryer pays for itself very quickly.

miho schrieb:

Here (steep south-facing installation), April was by far the best month since 2017. For you, with the east/west setup, summer might still improve a bit, but the sunny and cool days in the past weeks have been really great for generation.

Yes, I’m aware of that. But honestly, with my large system, it’s not that relevant. Even when it’s heavily overcast, it still produces between 2 and 4 kW, and I rarely exceed that with my own consumption.

Zaba12 schrieb:

I can already take that worry away from you. Just consider that after the time change, from 5 p.m. (17:00) onward, there’s no more generation, and all the household activity starts then—not to mention the heat pump (at least in our case, or do you have gas heating?). You can only mitigate that by shifting the dryer, washing machine, cooking, and baking to midday. Even then, without a storage system, I wouldn’t expect 40% self-sufficiency on an annual average.

Well, we still have a gas heating system in the old house (unfortunately), so no heat pump. Things would definitely be different with a heat pump, no doubt! But even then, I could cover a lot of my own electricity use with the system if I only ran it during the day.
We don’t do much cooking in winter because we have a wood stove. So during the dark months, the electric oven might be used every two weeks or so; otherwise, everything runs on wood. The dryer hardly ever runs anymore since the little one is out of diapers. We can also schedule the washing machine and dishwasher quite well.

Well, in July we’ll be making some changes. Since the whole house will no longer be occupied by family and we’ll be renting out an apartment, the photovoltaic system will only be connected to our apartment. From then on, I can monitor a full year and will be wiser a year later about how much we can really achieve. I think it will come out at around 60%, but that’s just an estimate from someone who has only had a system for a short time. And I know that estimate is very optimistic, but I’m familiar with...

Here are the promised values from yesterday, the first day. Until sunset, we achieved 65% self-sufficiency. Then, showers were taken and hot water was prepared (air-to-water heat pump). The heating system has not yet been connected (SmartGrid). Otherwise, no hot water preparation would have taken place.