Photovoltaics with later battery retrofit, what do I need?

Hello!

I am currently getting into the topic of photovoltaics. At the moment, I am still dealing with the bare technology, i.e., I have not yet reached the point of complicated calculations or VAT manipulations :)

I want to cover the roof of our house, which is currently being planned, as fully as possible with modules. According to the current status, we would have a gable roof facing 20° southwest with a 35° tilt. When I torture common calculators, we would probably end up somewhere in the range of 16-18 kWp, while the later mentioned inverter could handle 15 kWp if I read that correctly.

The goal, of course, is to use the sun as efficiently as possible throughout the day and possibly retrofit a storage system at a later stage. Depending on the offer, the storage might already be installed directly during construction. Ideally, the system can supply the house with three phases in the event of a power outage, even more ideally, the whole thing would work permanently similar to an online UPS (no idea if that is possible). Soon, an electric car will also be added, and there is already an OpenWB Series2 Standard+ wallbox.

Since the wallbox installer is also the local solar technician, I briefly interviewed him about photovoltaics in passing. He generally installs SMA, Fronius, Kostal, or E3DC. Google has already told me that the Fronius Symo GEN24 PLUS is a pretty nice device and also supports my backup power plans (standard is single-phase as a socket, but apparently you can upgrade to full backup "with everything"). I would like to have the Hyundai S395VG All Black panels since I do not want a blue roof.

What do I need for all this (I mean everything except cables or mounting material)? The Fronius GEN24 PLUS, the Fronius Smart Meter, panels, the EVU box for the OpenWB? BYD storage systems supposedly fit well with this.

As I said, the solar technician will surely be able to tell me this as well, but I would like to be somewhat conversant on the topic. So far, only the bare OpenWB Standard+ is available.

What exactly is the question now?

Full Black Modules are available from various manufacturers.
Storage only makes sense with subsidies ([KFW40+] etc.).
Full emergency power supply for the entire house is rarely easy to achieve.
Usually, you then need transfer switches, etc.

The question is aimed exactly at something like a switch, which you mention. As written, I want to know which devices I need for the project. So far, I know about the inverter with smart meter, the storage, and of course the modules. For example, if I also want to do surplus charging with the OpenWB, the inverter or the communication between the OpenWB and the inverter can handle that as well. Without such an inverter, I would need the EVU kit from OpenWB, for example. That's the kind of components I'm talking about :)

You asked me that in another thread. Here now from us, what exactly is the question or requirement?

To retrofit a (DC) storage, you need an appropriate inverter. That's basically it.

You don't need the EVU Kit for the oWB if the Fronius Smart Meter (or equivalent) is installed.

You asked me that in another thread. Here now from us, what exactly is the question or requirement?

:cool: Okay, then I will try to summarize it again. I want to: - optimally use the sun throughout the day (house gets KNX, at least a 4-split air conditioner and maybe a small pool with heat pump later) - store surplus and use it in times of little sun - use the storage as three-phase emergency power for the house and possibly achieve some filtering - charge the car with surplus (also from the battery) - feed in the rest, if there is any Question: - what technology do I need for this? Currently I have googled that I of course need panels, an inverter, the smart meter, a storage unit, and my wall box. Through this thread, the question arises whether I need an additional switch for emergency power operation with the mentioned wall box.

To retrofit a (DC) storage, you need a corresponding inverter. That's basically it. You don't need the EVU kit for the oWB if the Fronius Smart Meter (or similar) is installed.

Thanks! The Fronius GEN24 PLUS should be able to do that, as far as I understand. That the EVU kit is not necessary when using the Fronius smart meter sounds reasonable. Now the next question is whether I need an additional device for switching to emergency power with this inverter. As far as I understand from the Fronius website, that is not necessary, even if more than the small integrated photovoltaic point is to be used.