Offer, evaluate photovoltaic system technology

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’s not overly optimistic, that is simply a current fact.

Maybe at some point the fun of emptying the storage every day will wear off and you’ll start consuming electricity during the day as well.

Unless September is, for some reason unknown to me, an extraordinarily good month for photovoltaic power?

Not for photovoltaics, but the transition period is really the best time for storage. The nights are already very long (yes, also the evenings) and yet there is still enough from the roof to fill the storage.

But dual home office + our consumers complement the storage exceptionally well.

Why should a storage be good in the home office?
Especially then you have the opportunity to charge the car during the day, run the washing machine, dryer, etc. during the day.

So despite your facts, I can guarantee that you will not get the storage full and empty every day.

The storage may only supply the house. We have a PTH metering concept; it is not permitted 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, namely exactly when the storage is empty in the morning, I am relatively sure that we are consuming our own generated electricity.

Electricity meters balance the phases.
You have 3 phases; depending on the storage, it produces either on one or all phases.
Your consumers are mostly single-phase and then quite likely draw from another phase.
So even if the sum is zero, the likelihood is high that you are using coal power to game while feeding in your photovoltaic/storage power.

But you’re probably already noticing: the storage was also a bet for us from an ideological perspective.

How can one argue ideologically for a storage?
It does not generate electricity.

I do understand the argument regarding UPS somewhat though.

Just that alone is so German ;) So incredibly pointless that it almost hurts.

Why is that?
What sense would it make for a private person to feed electricity into the grid that does not come from a renewable energy system?
After all, the feed-in tariff is a subsidy, so the earmarking makes sense!

What sense would it make for a private person to feed electricity into the grid that does not come from a renewable energy system? The feed-in tariff is after all a subsidy, so the purpose limitation does make sense!

Exactly! So why is it then forbidden? Of course, it doesn't make sense to buy for 30-40 cents or say 18 cents - just to feed in for 8 cents ;)

Only as described here: People cannot simply take a dynamic tariff and charge the storage because they risk falling out of the Renewable Energy Sources Act.

Exactly! So why is it then forbidden? Of course, it doesn't make sense to buy for 30-40 cents or let's say 18 cents - only to feed in for 8 cents ;)

Because otherwise people start doing strange things: feeding in from the diesel generator, from the car, etc.

Just like described here: people can't simply take a dynamic tariff and charge the storage because they risk falling out of the Renewable Energy Act.

That is naturally not a problem. You are definitely allowed to charge the storage from the grid. People do that sometimes and will do so at some point in winter when the little that comes from the photovoltaic goes directly to the heating and nothing is left for the storage and it becomes dangerously empty due to its own standby consumption. Yes, at the latest then the storage draws power from the grid and that is allowed.

Because otherwise people start doing strange things: Feeding in from the diesel generator, from the car, etc.

Yes, some fools. Again: Technically it's straightforward – it's about preventing a few from possibly making a few cents from it. The rest are hindered.

That is of course not a problem. You are allowed to charge the storage from the grid. It is done occasionally and will also be done sometime in winter when the little that comes from the photovoltaic goes directly into the heating and nothing is left for the storage and it eventually gets dangerously empty due to its own standby consumption. Yes, at the latest then the storage draws power from the grid and that is allowed.

That is clear. But that is not what this is about here :-)

Unless September is for some reason an exceptionally good month for photovoltaic power that I do not know about?

The current September is already above average. You can calculate something like this with the PVGIS tool and my little BKW is currently at 131.8% of the "normal" average September ;)

Maybe someday the fun of emptying the storage every day will wear off and you’ll start consuming electricity during the day as well.

We actually consume as much electricity during the day as possible. We also fill the dishwasher(s) in the evening, but don’t run them until the next day when the sun is shining. Washing machine/dryer run exclusively when the sun is out. We optimize to that extent already.
The car only charges when the sun is out, not from the storage. That’s our personal luxury, since we don’t commute and therefore don’t rely on the car always being ready at 90%. If it has 50% and it’s dark, we don’t need to charge it.
We don’t try to force the storage to be emptied. We rather try to reduce the last 4 kWh we have to buy expensively in the morning. That’s why the goal is always for the storage to last as long as possible.
At the moment, simply so much power comes from the roof that we cover the load during the day, fill the storage, and then still feed a good amount back in.



What I don’t do, however, is give up my comfort for it. I wouldn’t skip a bath in the evening to save electricity. We don’t go that far, even though we optimize what’s possible by time of day.