Hello. We would also like to install a photovoltaic system and currently have three quotes. So far, we have received two, and the third one is still being prepared.
A local provider offered us the following:
40 x 410 W mono S4 half-cut modules = 16.4 kWp
Q.HOME+ ESS HYB- G3 3-phase 15.0 kWp inverter & 6.0 kW battery storage
Including installation, scaffolding, new distribution board, grounding rod, equipotential bonding bar, and all formalities and registration for just under €29,400.
The modules are arranged facing south-southwest and some towards northeast.
The second offer is almost the same price but has significantly lower kWp and comes from a company operating nationwide in Germany.
Do you think this is reasonable? I personally find it still quite expensive and am curious about the third offer. Are the components okay?
A local provider offered us the following:
40 x 410 W mono S4 half-cut modules = 16.4 kWp
Q.HOME+ ESS HYB- G3 3-phase 15.0 kWp inverter & 6.0 kW battery storage
Including installation, scaffolding, new distribution board, grounding rod, equipotential bonding bar, and all formalities and registration for just under €29,400.
The modules are arranged facing south-southwest and some towards northeast.
The second offer is almost the same price but has significantly lower kWp and comes from a company operating nationwide in Germany.
Do you think this is reasonable? I personally find it still quite expensive and am curious about the third offer. Are the components okay?
guckuck2 schrieb:
The larger the photovoltaic system, the more likely it is that some energy will be stored even during winter, yes.
However, you need to convert these small daily yields into “production hours” to see whether the household actually consumes all the energy generated. Especially when working from home. These small daily yields are still from our old, small system. The new one will have significantly higher kW peak and will deliver accordingly more. Therefore, I don’t think the household can consume everything. Although these figures were really just for January. December and January are expected to be the worst months for the battery, which makes sense. But February through November will look different.
D
DaGoodness8 May 2023 11:04guckuck2 schrieb:
The larger the photovoltaic system, the more likely it is that some energy will be stored during winter, yes.
However, you have to convert these small daily yields into "production hours" to see whether the household doesn’t consume all the energy anyway. Especially when working from home.
On the other hand, there is also a maintenance charge from the grid.
260 cycles is quite a lot. You would need to know more about the system size and personal usage habits. Individual values can be very misleading. I have a 10 kWp system on the roof and a 10 kWh battery storage.
I already started a separate thread on this topic some time ago.
In that thread, it was already pointed out that our usage behavior is not average.
Of course, the values alone don't say much. You can see that just by comparing my values with kati’s.
From January 20, 2022 to January 31, 2022, she generated 31.701 kWh with her 4.55 kWp system.
In the same period, my 10 kWp system produced 129.1 kWh.
So more than four times the yield with only twice the system size.
Therefore, many other factors play a role, such as the type of modules, system orientation, location (apparently we had a bit more sun in that period than she did), and many others.
B
Bausparfuchs8 May 2023 11:32There is the battery storage system and the associated hybrid inverter. Usually, though there are certainly other, more complex systems.
The settings for the battery are managed through the inverter. The battery is connected to the inverter and operates according to the inverter’s instructions. With a good quality inverter that is well-matched to the battery, you can configure almost everything.
For example, I have set mine so that the battery only charges when there is photovoltaic (PV) production. No energy from the grid flows into my battery. Zero! The house load is prioritized first, then the battery charges, but only when the PV system is running. When I have consumption, power is drawn from the battery until it is empty.
That way, I achieve zero grid feed-in (about 0.1 kWh per day is still used, but that can be neglected).
On a sunny day like today, I expect about 30 kWh of PV production. The battery was fully charged at around 6:00 PM (18:00). Tomorrow we have a rainy day with about 3 kWh of PV output, yet my grid consumption will still be close to zero.
My personal goal of minimizing grid consumption can only be reached with a battery. For me, it was about maximizing self-consumption. Others may want to do something for the environment or earn returns by feeding as much as possible into the grid with a fully installed rooftop system. They don’t need a battery.
If you want to bake a chicken at 10:00 PM (22:00) with a 30 kW peak (kWp) system on the roof and have to buy expensive electricity from the grid, that hurts. For me, it only hurt once – when I bought the battery.
One more thing about flexibility: I have a Huawei system installed, which runs very reliably. It’s almost infinitely expandable. I can cascade inverters, so I can add more modules to my roof and connect a standard inverter to the hybrid inverter. I can expand my battery and cascade that as well, up to what I understand is 90 kWh. I can connect a wind or water turbine, and bidirectionally charge if an electric vehicle arrives.
Recently, I read about a promotional price for a 10 kW battery storage system at 2,500 euros. So why shouldn’t it be economically viable?
Anyone installing a standard system without a battery today will need to start again in five years. Because by then batteries will be cost-effective and much cheaper. Then you start over: new inverter, smart meter, data cables, and so on. You might as well do it all at once. Batteries can always be expanded later.
The settings for the battery are managed through the inverter. The battery is connected to the inverter and operates according to the inverter’s instructions. With a good quality inverter that is well-matched to the battery, you can configure almost everything.
For example, I have set mine so that the battery only charges when there is photovoltaic (PV) production. No energy from the grid flows into my battery. Zero! The house load is prioritized first, then the battery charges, but only when the PV system is running. When I have consumption, power is drawn from the battery until it is empty.
That way, I achieve zero grid feed-in (about 0.1 kWh per day is still used, but that can be neglected).
On a sunny day like today, I expect about 30 kWh of PV production. The battery was fully charged at around 6:00 PM (18:00). Tomorrow we have a rainy day with about 3 kWh of PV output, yet my grid consumption will still be close to zero.
My personal goal of minimizing grid consumption can only be reached with a battery. For me, it was about maximizing self-consumption. Others may want to do something for the environment or earn returns by feeding as much as possible into the grid with a fully installed rooftop system. They don’t need a battery.
If you want to bake a chicken at 10:00 PM (22:00) with a 30 kW peak (kWp) system on the roof and have to buy expensive electricity from the grid, that hurts. For me, it only hurt once – when I bought the battery.
One more thing about flexibility: I have a Huawei system installed, which runs very reliably. It’s almost infinitely expandable. I can cascade inverters, so I can add more modules to my roof and connect a standard inverter to the hybrid inverter. I can expand my battery and cascade that as well, up to what I understand is 90 kWh. I can connect a wind or water turbine, and bidirectionally charge if an electric vehicle arrives.
Recently, I read about a promotional price for a 10 kW battery storage system at 2,500 euros. So why shouldn’t it be economically viable?
Anyone installing a standard system without a battery today will need to start again in five years. Because by then batteries will be cost-effective and much cheaper. Then you start over: new inverter, smart meter, data cables, and so on. You might as well do it all at once. Batteries can always be expanded later.
M
motorradsilke8 May 2023 11:56Or bidirectional charging will finally be possible, and you won’t even need a separate storage system.
motorradsilke schrieb:
Or then bidirectional charging will finally be possible, and you won’t even need a separate storage system.And the car’s battery might be strained if it has to handle so many charge and discharge cycles. I once found an example from Tesla where hundreds of cars with photovoltaic systems had no grid connection at all; the island was self-sufficient.
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