Single-family house photovoltaic system with 30KW

I think I will stay under 25 kWp.

You can also already install the modules and only connect those over 25 kWp later as a new system. The same applies for the 30 limit with income tax.

I estimate the annual consumption at 4.5 kW, since I also want to install 2 or 3 air conditioning split units.

With heat pump and air conditioning, rather expect 6,000 kWh. If you assemble it yourself, the whole thing even pays off with the 8 cent feed-in tariff. Therefore: fill up the roof!

The same applies to the 30 limit for income tax.

That is wrong. The total output per operator counts. The only trick here would be if 2 systems are run separately by each (spouse) partner. However, the time component does not matter again; they can be installed simultaneously, of course as separate systems with separate inverters.

To my knowledge, it is not possible to exceed the 25 kWp limit per connection. However, I am not 100% sure about that just from gut feeling.

I have two storage units: one with 42kWh and one with 84kWh.

The great thing about them is: they even have wheels and a steering wheel, so I can drive them on vacation!

As long as they do not feed back into the system, they are technically more consumers than storage. I am definitely curious about bidirectional charging. Unfortunately, neither our system nor our BEV can do that at the moment. It’s a pity that even as an island solution, it’s still a complete rarity.

I am definitely curious about bidirectional charging. Unfortunately, currently neither our system nor our BEV could handle it.

Oh, how long have we been waiting for that. Since when did VW want to equip its ID fleet with the possibility of bidirectional charging?
Oh, there are legal issues in Germany. And what about tenant electricity models?

That doesn’t work right now either. Problems with billing.

It remains to be noted that it is not due to the generation of renewable energies but to the bureaucracy in the country and its disastrous infrastructure.
A lot would be possible. However, that is not always in the interest of grid operators, electricity companies, and politics.

That is very pessimistic. Yes, real V2G does not exist anywhere relevant outside of research projects. Understandable, because an unpredictable feed-in participant enters the market without integrating into the existing processes there. That may be irrelevant with 5 cars, but in larger numbers they destroy the grid frequency. At the same time, this is only interesting for old contracts that still have high feed-in tariffs. For everyone else it makes no difference or is only disadvantageous, then one could have fed directly into the grid from the roof. This will only become interesting once dynamic tariffs for feed-in become available.

V2H is already purchasable, so far only as DC and at absurd prices, but from now until mid-2025 some AC wallboxes from well-known manufacturers are announced. V2G ready, but that will not be allowed either, just like currently feeding in from the battery in the basement is not permitted.

Tenant electricity has significantly improved with Solar Package 1? or 2?! If that is relevant for you, it is now not perfect but worlds better! Due to the mandatory installation of IMS and the permission of virtual total meters, only meters for end users, producers, and once for the grid connection are necessary. So one more 2-way meter than is necessary anyway. Via software you can define arbitrary distributions and at the same time no longer have to act as an energy supplier towards the tenants. They keep their contract with the supplier of their choice as usual and pay you their share of the consumed photovoltaic electricity. Your selling price can be designed as you want, tax is partly somewhat special, but as a landlord you have to deal with it more anyway than employees.

that is also relatively clearly stated in the letters from the Federal Ministry of Finance: The systems count per taxpayer or partnership. Thus, for the exemption, 2 independent systems up to 30kWp are possible. I would be interested to know how proof can be provided that they do not belong jointly to the spouses but separately. In most cases this will probably fail beforehand, because the grid operator will throw up his hands when asked about a 60kWp system.

Since when did VW actually want to equip its ID fleet with the possibility of bidirectional charging.

It has been possible for a long time. In what time have you been stuck?

“With the Hauskraftwerk S10 E COMPACT from the Volkswagen partner E3/DC, you supply your home with solar energy and cover all household consumption as much as possible with your photovoltaic system thanks to the Home Energy Management System (HEMS). The system automatically controls the DC charging station to use solar power specifically for mobility, optimize the degree of self-sufficiency, and increase your safety during a longer power outage. This allows you to ensure that your ID. is charged primarily or exclusively with solar power. In addition, ID. models with a suitable battery size from 77 kWh and ID. software 3.5 from factory or higher can be integrated into the system as mobile storage. Even if energy is supplied to your home, 20% of the battery capacity always remains in the vehicle.”