ᐅ Photovoltaic system with future battery upgrade: What do I need to consider?
Created on: 28 Sep 2021 20:12
A
Araknis
Hello!
I am currently getting familiar with the topic of photovoltaics. At the moment, I am still focused on the basic technology and have not yet reached the point of dealing with complicated calculations or VAT issues 🙂
I want to cover the roof of our house, which is currently in the planning stage, as fully as possible with solar panels. According to the current plan, we have a gable roof facing 20° southwest with a 35° pitch. When I use common online calculators, the results suggest a system size of around 16-18 kWp, while the inverter mentioned later seems to support 15 kWp, if I understand correctly.
The goal is, of course, to make the most efficient use of sunlight throughout the day and possibly to retrofit a battery storage system later on. Depending on the offer, the battery might be installed directly during construction. Ideally, the system could supply the house with three-phase power during a blackout, and even better if it could operate continuously like an online UPS (I’m not sure if that is possible). An electric vehicle will also be added soon, and we already have an OpenWB Series2 Standard+ wallbox installed.
Since the wallbox installer is also the local solar technician, I briefly interviewed him about photovoltaics. He typically installs SMA, Fronius, Kostal, or E3DC systems. Google has already shown me that the Fronius Symo GEN24 PLUS is a pretty good inverter and supports my backup power plans (standard has single-phase output via socket, but it can apparently be upgraded to full backup with all phases). For panels, I would like to use the Hyundai S395VG All Black because I don’t want a blue-colored roof.
What exactly do I need for this (I mean everything except wiring or mounting materials)? The Fronius GEN24 PLUS inverter, the Fronius Smart Meter, the panels, the utility connection box for OpenWB? From what I understand, BYD batteries are compatible.
As I said, the solar technician will surely be able to tell me all this, but I would like to be somewhat knowledgeable as well. So far, only the bare OpenWB Standard+ is installed.
I am currently getting familiar with the topic of photovoltaics. At the moment, I am still focused on the basic technology and have not yet reached the point of dealing with complicated calculations or VAT issues 🙂
I want to cover the roof of our house, which is currently in the planning stage, as fully as possible with solar panels. According to the current plan, we have a gable roof facing 20° southwest with a 35° pitch. When I use common online calculators, the results suggest a system size of around 16-18 kWp, while the inverter mentioned later seems to support 15 kWp, if I understand correctly.
The goal is, of course, to make the most efficient use of sunlight throughout the day and possibly to retrofit a battery storage system later on. Depending on the offer, the battery might be installed directly during construction. Ideally, the system could supply the house with three-phase power during a blackout, and even better if it could operate continuously like an online UPS (I’m not sure if that is possible). An electric vehicle will also be added soon, and we already have an OpenWB Series2 Standard+ wallbox installed.
Since the wallbox installer is also the local solar technician, I briefly interviewed him about photovoltaics. He typically installs SMA, Fronius, Kostal, or E3DC systems. Google has already shown me that the Fronius Symo GEN24 PLUS is a pretty good inverter and supports my backup power plans (standard has single-phase output via socket, but it can apparently be upgraded to full backup with all phases). For panels, I would like to use the Hyundai S395VG All Black because I don’t want a blue-colored roof.
What exactly do I need for this (I mean everything except wiring or mounting materials)? The Fronius GEN24 PLUS inverter, the Fronius Smart Meter, the panels, the utility connection box for OpenWB? From what I understand, BYD batteries are compatible.
As I said, the solar technician will surely be able to tell me all this, but I would like to be somewhat knowledgeable as well. So far, only the bare OpenWB Standard+ is installed.
R
RotorMotor29 Sep 2021 08:59I am not aware of any hybrid inverter over 10 kW, or has there been any new development?
And it definitely makes more sense to install 18 kWp rather than messing around with storage gadgets.
So you would simply need to look for an off-grid capable battery inverter.
And it definitely makes more sense to install 18 kWp rather than messing around with storage gadgets.
So you would simply need to look for an off-grid capable battery inverter.
Update: For a true three-phase backup power solution with the GEN24, you also need 2 contactors, 2 relays, and a 12 V auxiliary relay, as well as RCD and circuit breakers. You can either assemble it yourself according to the wiring diagram or purchase a ready-made system from an external manufacturer. The switchover time to battery power is reportedly about 90 seconds during a power outage, but this can be managed for critical devices.
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Deliverer4 Oct 2021 14:24If you don’t want to burn through a lot of money, skip the battery storage and especially the expensive backup power system. You’ll spend five figures just for having an extra hour of electricity every five years compared to others. In an emergency, that’s all the battery can realistically provide anyway.
For now, install solar panels to cover your entire roof area. (In winter, 50 kWp is still too small. Especially if you have a battery and an electric car.) And if your inverter fails in 15 years AND battery prices have dropped to a quarter of what they are now, you can easily upgrade or retrofit then.
For now, install solar panels to cover your entire roof area. (In winter, 50 kWp is still too small. Especially if you have a battery and an electric car.) And if your inverter fails in 15 years AND battery prices have dropped to a quarter of what they are now, you can easily upgrade or retrofit then.
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