Electricity prices have been rising for months. With one of your own photovoltaic system (short: PV) you make yourself to a large extent independently from the market and thus also from inflation and price increases. Especially profitable is the investment when you only have to buy a little more expensive electricity from the grid. If you have a few tips note, you can your ownconsumption increase and thus compensate for the sunless times.
the yield of your solar system depends on various factors. Next to the investment costs or the costs for repair and maintenance, the amount of the self-consumption a crucial role in this. Because you can only save a lot with a PV system if the costs for the electricity you generate are significant lower fail than those for electricity from the grid. With electricity prices soaring, worth it the investment is all the more worthwhile. This factors play into the yield of your solar system:
- investment costs
- Operating costs (repair and maintenance)
- Yield of your PV
- Cost of electricity from the grid
- Amount of the feed-in tariff
- Lifetime (estimate)
- Interest when taking out a loan
The electricity generated with a PV system costs around 8 to 12 cents per kilowatt hour (kWh). Electricity from the grid currently costs an average 37 cents. If you were 100% self-sufficient, you would get between 28 and 32 cents per kilowatt hour save up. And the higher the electricity costs rise, the faster amortized your PV system.
You might also be interested in: Planning a solar system: These 6 factors influence the profitability of your PV
How to calculate your savings:
The savings of one higher self-consumption can be calculated relatively easily by multiplying the electricity price of your energy supplier by the amount of solar electricity that you actually use yourself.
Here one Calculation example for a family of four, for which we assume a grid electricity price of 37 cents and the operation of a solar system with 6 kilowatt peak (kWp). The solar system produces a total of around 5,400 kWh of solar power per year.
- 37 cents mains electricity costs
- * 1,620 kWh solar power consumption (corresponds to 30 percent of 5,400 kWh)
- = approx. 600 euros savings per year
- 37 cents mains electricity costs
- * 3,780 kWh solar power consumption (corresponds to 70 percent of 5,400 kWh)
- = approx. 1,400 euros savings per year
In both cases, in addition to the savings in electricity costs, there is also the EEG remuneration for feeding in excess electricity. As the example calculation shows, a solar system is worthwhile all the more, the more higher own consumption is lost. There are various options for this, some of which you already have at the planning of your PV system should be taken into account.
Own solar system: 5 tips for high self-consumption
1. Solar system with power storage essential for high self-consumption
In the Night or at cloudy weatherif your PV system produces no or less electricity, your electrical installations and electrical devices will automatically do the same electricity from the grid provided. To avoid this, a battery storage the best possibility. excess electricity is saved and supplies you with energy when your solar system is not producing. You also have the option of combining your PV system with a power storage unit to retrofit.
You can find out more about solar power storage in this article: How useful is a solar system with storage? Costs for acquisition & operation – what will play into your hands in 2023
2. The right orientation of your PV for the greatest possible yield
Also the right one alignment of your PV system is important for the highest possible self-consumption rate. However, with this option you should already before installation deal with. To what extent you the plant optimal can align depends on the existing houses locationpossible shading and the nature of the roof. If you are building your house from scratch, you have the option of already aligning it with the planning to include. You can achieve maximum yields with one south orientationbut an east-west orientation is also worthwhile.
You can find out more about the optimal alignment of your solar system in this article: Table reveals what yield is possible – 5 optimization tips
3. Increase self-consumption with a heat pump
heat pumps use the energy from the environment and convert it into warmth around, which you can then use for heating. To do this, they need electricity. If this can be done with electricity from the grid, it is of course an expensive affair. However, the connection to your solar system is a good opportunity to increase the self-consumption of solar energy and at the same time to heat save up.
Also see this article on the subject of heat pumps and PV: Combining a solar system with a heat pump: This component completes the successful team!
4. Control household appliances in a targeted manner: Use electricity when it is produced
If you domestic appliances If you use it in a targeted manner, you can also increase your own requirements. This works best if you, for example, washing machine, tumble dryer or dishwasher runs when the PV system produces electricity – so during the day. For example, if you go to work before sunrise and come home late, you have the option of using the devices with a timer to set in motion. If your house with a corresponding Smart home system equipped, you can also do this via a apartment take care of. When it comes to water-using devices, make sure you check with yours beforehand insurance agree whether they water damage takes over if you are not at home while doing the laundry.
5. SmartHome and energy management systems for optimal utilization
into a Smart home system you can too energy management system to implement. This allows you to know the exact times of the use of the devices set and also change during the course of the year. Washing machines, dishwashers and the like start up when the PV system produces electricity. But not only that: Such systems get themselves data from the internetfor example this weather at your location. If about within a day different weather conditions prevail – cloudy in the morning, sunshine in the afternoon – the devices settle down right time in progress.
We have summarized more about saving energy with SmartHome for you here: Saving energy with Smart Home: How can that work – is it worth retrofitting?
Increase self-consumption: conclusion
Both rising electricity prices is the increase of self-consumption of your generated solar power is of great importance. Self-consumption has large impact on returns your PV system. To increase this, you have various possibilitieswhich are easy to implement if they are already in the planning of the solar system are included.
Another advantage the highest possible self-consumption is the grid stability. Around a quarter of the German energy mix comes from wind power. You cannot control the strength of the wind. On days when strong winds blow across a large area, wind turbines feed a larger amount of electricity into the grid. This can lead to overload or fail. This does not affect you as the operator of a PV system, or only to a certain extent. the Danger a grid overload is accompanied by increased self-consumption lower.
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