Consultation for photovoltaic systems

We have a consumption of 3900 kWh, of which 975 kWh come from the grid.

Battery BYD 5.2 kWh: 1510 kWh charged, 1174 kWh discharged. 290 full cycles. Efficiency 78%.
Well, the inverter is wrongly sized, my mistake (5 kW instead of 3.2 kW).
8600 kWh yield from a 10 kWp SSW system on a flat roof (5°).

If I only consider the discharged energy, that is 1174 kWh * 0.285 cents per kWh = €330 savings.
The loss of 1510 kWh * 0.10 cents per kWh = €151 feed-in tariff (+ the standby consumption when the battery is not charged) counters that.
I don't know how I could justify the investment of €5300?

The storage was free by a lucky coincidence. Otherwise, it would never have paid off.

Edit: If I had invested the €5300 gross in additional panels, that would correspond to an increase of 4 kWp; with about 860 kWh per kWp/year that would be around €344. Definitely better invested.

You built yourself a nice photovoltaic system. You consume just under 1000 kWh per year from the grid. The savings amount to 3000 kWh.
It doesn't get much better than that. That is exactly my goal. And you can see from this example very clearly that it can be achieved.

I'm not building this stuff for nothing. But when I look at Baerbock, I don't foresee anything good. By now, you are almost insulted as a loser if you have been getting your electricity from a so-called cheap provider for years.

But let's wait a few more months for the storage calculation. At maybe 45 or 50 cents per kWh for electricity consumption.

It's like with a Proxon air heater. When there is an airflow, it gets cold. Even with warm air. Then you don't even have a chimney in the expensively built Okal house and have to heat very expensively with radiators. I'm curious what will happen if it gets minus 25 degrees for 4 weeks and the great heat pumps have to run at full capacity. It will be exciting.

And if you look around?
Of 50 French nuclear power plants, 16 are currently broken. The German nuclear power plants are shut down. Plus coal power plants.
Nord Stream II is not wanted, gas storage tanks are empty. Instead of Russian gas via pipeline, liquefied gas from the USA is wanted.
In addition, a huge increase in electricity consumption. E-cars, infrastructure, heat generation, etc.

I really don’t know how they want to manage that.

You can read about this, among other things, at the Fraunhofer Institute.

So you really throw all topics together cheerfully and strongly polemicized, .

Baerbock has nothing and absolutely nothing to do with the current electricity prices, providers, or anything else.

Air heat pumps do not cause a "cold draft" when properly designed. With a correctly planned heat pump, nobody in a new building who wants to live environmentally consciously really needs a chimney.

At -25°C over 4 weeks, even the normal wood stock of today's single-family homes is quickly depleted and they are then allowed to heat with radiators, they just don't have any at home right now.

The fact that 16 nuclear power plants are defective and France is currently experiencing extremely high electricity prices (usually higher than in Germany on the stock exchange) only shows that it is right to choose the path away from nuclear power in the long term.

No one claimed that the one-sided German path towards Russian gas is good. We can thank Gerhard and then 16 years of the CDU for that. To bring the circle back to the beginning: that has nothing to do with Baerbock either. You can think what you want about her, but she hasn't destroyed anything so far. That was a colorful mix of CDU/FDP/SPD and at some point also the Greens as junior partners of Schröder.

So while writing my post, I briefly visited Twitter. This picture of her caught my eye, taken after her visit to Lavrov. That must have really taken a toll on her. I have never seen the pretty one so swollen and worn out. That inspired me to deviate from the original topic.

In my opinion the discharge quantity, i.e. losses already deducted. That’s also how my value is calculated.

Actually, one should take the energy on the DC side when charging the battery. Simply put, the rectified current flowing into the battery (*voltage*time*). The losses of the discharge quantity are partly converted into heat at the inverter. Due to the low base load overnight, the large inverter, and the unfavorable efficiency.
Additionally, standby consumption and self-discharge(?), these must have been energy previously in the battery. So the truth is probably somewhere between the two quantities?!

You have built yourself a nice photovoltaic system. You consume just under 1000 kWh per year through grid supply... The savings amount to 3000 kWh.
It doesn’t get much better.

Well, it could be better. The system is self-installed on our garage. I should have fully covered the house directly while the scaffolding was still up, i.e. East+West. That would increase self-consumption, especially in the morning and evening, during the transitional period and in winter. I would have much preferred that over the storage….

I have never seen the pretty one so swollen and worn out.

Some media reported that she had contracted conjunctivitis.