Evaluate offer, photovoltaic system technology

Hi,

Unfortunately, I have to be a spoilsport again. Your acquisition costs are not 6800 €, but 6800 € with interest and compound interest over 7 years. At about 4% currently, that is 8950 €. So, with the current electricity prices, you are adding about 500 euros.

Best regards,

Andreas

I am still quite satisfied with it, as we calculated somewhat pessimistically in places and I also hope that the unit won’t give up the ghost on the day the warranty expires. Besides, I like consuming the electricity that comes from our roof. There is nothing greenwashed or certificate-traded there. ;)

Edit: Also, if we calculate with interest rates, we should also take into account the likelihood of rising electricity prices.

I am still quite satisfied with it, since, as I said, we calculated pessimistically in some places and I also hope that the unit won’t give up the ghost on the day the warranty expires.

So you call one full cycle a day pessimistic?
That is simply absolutely overly optimistic.

And just because you manage to empty the battery frequently doesn’t mean that it makes sense.
For example, you could certainly schedule many consumers during the day, and in summer the days are simply longer.
You won’t be able to meaningfully empty such a huge battery every day.

Besides, I like to consume the electricity that comes from our roof. Nothing is greenwashed or certificate-traded there. ;)

And running it through a battery isn’t greenwashing?
And beware, it doesn’t have to be the case that the battery feeds into the phase where you are currently consuming. ;-)

Also, if we are calculating with interest, we should also factor in the probability of rising electricity prices.

You are right. The question is whether the increase in electricity prices will offset the financing costs of the storage?!? No one can say that at the moment, and you will only know in 10 years. As I already wrote; a storage system is basically a bet on rising electricity prices.

But I can well imagine that it feels good to consume "your own" electricity!

Best regards,
Andreas

You have to see it that way sometimes, not every technical installation in a house "pays off" from an economic perspective. No one calculates wiring, etc. either.

With , you also have to consider that two people work from home, both like to play Powergames, they have a heat pump, an electric car, and ventilation. And yes, with the storage system you also have to take the production footprint into account, but I trust to try to plan their electricity consumption in such a way that they minimize grid consumption and essentially reduce it to zero. And there I do see relief for the grids themselves.

And, I also have to agree with . We urgently need widespread variable electricity tariffs. It simply has to succeed that everyone starts thinking about their consumption and control. And in this case, it doesn’t matter that the "rich" can afford the expensive times more easily—they can already afford more now.

And yes, not everyone can shift every type of electricity consumption in a grid-friendly way, but everyone should also take a look at the features of their electrical devices... like time-controlled switching on and off, for example. It’s also such a hype that kitchen appliances/white goods should be smart, so then actually use them ;)

So you call a full cycle every day pessimistic?
That is simply absolutely overly optimistic.

And just because you manage to empty the storage frequently, doesn’t mean that it is sensible.
For example, you could surely shift many consumers to the day and in summer the days are simply longer.
You won’t be able to sensibly empty such a huge battery every day.

Well, we have been doing it for 19 days now, and we had it completely full 19 times, and completely empty 19 times in the morning?
In the morning, we draw between 0 and 4 kWh from the grid, that’s it so far. That is not overly optimistic, that is simply fact at the moment.
Unless September is for some unknown reason an exceptionally good month for photovoltaic power?
I’m not saying the storage pays off as well for other families as it does for us. But with dual home office + our consumers, the storage complements extraordinarily well.

And beware, it does not have to be that the storage feeds into the phase where you are currently consuming. ;-)

The storage is only allowed to feed the house. We have a PTH measuring concept, and it is not permissible to charge or discharge the storage via the grid. Since we feed in surplus and it must be ensured that no non-Renewable-Energy-Law electricity can be fed into the grid.
Since we currently draw a maximum of 3-4 kWh from the grid, and precisely then when the storage is empty in the morning, I am quite sure that we consume our own generated electricity.

You are right there. The question is whether the increase in electricity prices balances out the financing costs of the storage?!? Nobody can say that at the moment and you will only know in 10 years. As I already wrote; a storage is basically a bet on rising electricity prices.

That is true, although I find 4% somewhat optimistic? But I don’t know either, I’m not familiar with fixed deposits. Fairly speaking, when we ordered the storage, fixed deposit rates were not yet at 4% - so I couldn’t have known back then either. ;)
And we have a significantly lower burden on electricity installments monthly thanks to the storage. This freed-up money, which I don’t have to deposit with the supplier, I could also invest. We can then offset that against the financing costs again. ;)
But you probably realize: The storage was also a bet for us from an ideological point of view. We are happy every day when we look at autonomy. And if there is a power outage (which is not so rare in this area) we can continue working or cooking.
All of that together is already worth the 500€ over 7 years to me. ;)

Since we feed in surplus, it must be ensured that no non-renewable energy law electricity can be fed into the grid.

Just that is so typically Germany again ;) So utterly pointless it almost hurts.