ᐅ Do photovoltaic systems and heat pumps share similar performance characteristics or operational experiences?

toxicmolotow schrieb:


Basically just a great technical gadget.

Well – it is a gadget. We men need these kinds of toys. With an app. With graphics. The more details, the better.

But my wife doesn’t really understand my idea of washing laundry and running the dishwasher mostly when the sun is shining… the topic of self-consumption rate hasn’t reached level 10 excitement with her yet and only causes head shaking and doubts about my sanity. . It will come. . For sure. The enthusiasm.

Until then, I will connect smart plugs to the energy management system. Then the washing machine, dryer, and dishwasher simply won’t start unless there is enough sunshine. Probably the recipe to increase acceptance. I’ll report back. It’s going to be great.

Reading all this makes me really excited about our house.

Let’s see how strong my girlfriend’s nerves will be then.

It’s time for an interim review...

A few technical details:
18x 300W Winaico panels (5.4 kWp) connected to a Fronius Symo 5.0.3.M

Installed on February 7, 2016, so about 6 months and 3 weeks in operation.

Out of 3,835 kWh produced, we were able to use 36% ourselves; unfortunately, the rest had to be fed into the grid at 12.31 cents per kWh.

That means: 303 euros feed-in tariff, minus 60 euros VAT on self-consumption and 120 euros insurance. I am deliberately excluding taxes here. After depreciation of the system and expenses, I consider this a neutral position.

However, I actually saved 375 euros that the supplier didn’t have to deliver to me.

So: 303 - 60 - 120 + 375 = 498 euros saved. On the other hand, the system costs me 864 euros per year. Overall, I pay about 30 euros per month for the first 10 years, which I consider worthwhile.

I find the self-consumption rate of 36% and the autonomy rate of 50% without storage quite respectable. It’s hard to beat that, especially since I’ve had a 25m³ (6600 gallon) pool for 2 months now, which helps with this, as can also be seen in the consumption.

Do you pay 27 cents per kWh for the electricity you consume?

How are the costs of €864 composed? Depreciation over 10 years + interest + X?

Your self-sufficiency and self-consumption rates are probably not representative, as no winter months have been taken into account.

First of all, congratulations on your results. It should be noted that the summer this year was quite poor during the first months. In a month-to-month comparison from March to August this year, we fed less electricity into the grid each month than last year. However, our self-consumption likely did not increase since we already achieved an exceptionally good result in the first year.

You are running your heat pump (heating + water) through the photovoltaic system as well—of course, that will help you achieve even greater autonomy.

However, I have to agree with @Musketier.
You will only get a meaningful overview after completing the entire year. The challenging periods are still ahead. Your self-consumption rate (consumption from total production) will increase—your feed-in to the grid will decrease—and your external electricity consumption will rise.
But this is nothing new to you—you’ve been dealing with this long enough.

Above all, the pool is quite a factor – a small power consumer that still improves the overall result. Without such an appliance, the situation looks different again.

I will find a way to implement it anyway... regardless of whether it is economical or not...