Hello everyone,
I have tried to learn about photovoltaic systems, but so far I have mostly come across very optimistic (Google) advertising offers. Here in the forum, I have mainly read critical (mostly older) posts.
About my concern:
We are currently planning a (pitched roof) new build for early 2017 with a south/east and north/west orientation, and so far we have followed the classic gas condensing boiler/solar thermal system with a hot water storage tank concept. A colleague at work brought photovoltaics to my attention. When he told me that he (theoretically) generates 3500 kWh/year with a system he bought for 7000€ about three years ago (but without a battery storage), I became curious.
I would like to know how realistic it is to achieve such output with an investment of around 10,000€ and to use it entirely on your own? We currently live in an apartment (3 people) and consume about 3800 kWh/year. Of course, I have quickly dismissed the idea of an easy profit from the “fast market”...
If even remotely possible, I would appreciate any literature or pricing information for such a project.
I have tried to learn about photovoltaic systems, but so far I have mostly come across very optimistic (Google) advertising offers. Here in the forum, I have mainly read critical (mostly older) posts.
About my concern:
We are currently planning a (pitched roof) new build for early 2017 with a south/east and north/west orientation, and so far we have followed the classic gas condensing boiler/solar thermal system with a hot water storage tank concept. A colleague at work brought photovoltaics to my attention. When he told me that he (theoretically) generates 3500 kWh/year with a system he bought for 7000€ about three years ago (but without a battery storage), I became curious.
I would like to know how realistic it is to achieve such output with an investment of around 10,000€ and to use it entirely on your own? We currently live in an apartment (3 people) and consume about 3800 kWh/year. Of course, I have quickly dismissed the idea of an easy profit from the “fast market”...
If even remotely possible, I would appreciate any literature or pricing information for such a project.
Hello,
I am interested in hearing the opinions of the experts here in the forum regarding our project:
A KfW 40+ house built with timber construction (not timber frame) with two apartments, definitely including photovoltaic panels, as we plan to purchase an electric vehicle as a second car within the next three years. With KfW 40+ and two apartments, we receive an additional €10,000 repayment bonus compared to KfW 40 without photovoltaic and battery storage, which would cover almost half of the system cost.
My questions are:
What does the economic feasibility look like when the repayment bonus for photovoltaic and battery storage is included?
How large should the photovoltaic system and battery storage be in this case?
I tend toward a larger photovoltaic system (at least 10 kWp and approximately 6 kW battery) due to the electric vehicle, which can mostly be charged during the day. The roof is sufficient for this: a north-facing shed roof with a 9° (degree) angle, so the photovoltaic system would be mounted on supports. Additionally, about 4 kWp would be installed on the south façade and the 12-meter (39 feet) wide south balcony with a lower tilt of about 20° (degrees).
I am interested in hearing the opinions of the experts here in the forum regarding our project:
A KfW 40+ house built with timber construction (not timber frame) with two apartments, definitely including photovoltaic panels, as we plan to purchase an electric vehicle as a second car within the next three years. With KfW 40+ and two apartments, we receive an additional €10,000 repayment bonus compared to KfW 40 without photovoltaic and battery storage, which would cover almost half of the system cost.
My questions are:
What does the economic feasibility look like when the repayment bonus for photovoltaic and battery storage is included?
How large should the photovoltaic system and battery storage be in this case?
I tend toward a larger photovoltaic system (at least 10 kWp and approximately 6 kW battery) due to the electric vehicle, which can mostly be charged during the day. The roof is sufficient for this: a north-facing shed roof with a 9° (degree) angle, so the photovoltaic system would be mounted on supports. Additionally, about 4 kWp would be installed on the south façade and the 12-meter (39 feet) wide south balcony with a lower tilt of about 20° (degrees).
K
Knallkörper23 Nov 2016 10:15As mentioned before and discussed many times, the storage system is not cost-effective. It will be even less worthwhile if you already have storage in the form of your electric vehicle!
L
laien.haft25 Nov 2016 12:53Knallkörper schrieb:
As previously mentioned and often discussed, the storage system is not cost-effective. It especially won't be worthwhile if you already have storage in the form of your electric vehicle! ... because the vehicle is always parked at home when the sun is shining?
laien.haft schrieb:
... because the vehicle is always parked at home when the sun is shining? Especially since electricity is also generated when the sun isn’t shining.
laien.haft schrieb:
... because the vehicle is always parked at home when the sun is shining?No, but the profitability of the battery storage mainly depends on it being charged and discharged as fully and as often as possible during its (short) lifespan. This does not happen if, for example, the photovoltaic system is too small or if there are other large consumers (heat pump, electric car), meaning self-consumption is already quite high even without storage.
I’ll link to myself here:
https://www.hausbau-forum.de/threads/hat-sich-schon-jemand-mit-dem-sog-store-paket-der-fa-Solarwatt-befasst.16947/#post-159294
If KFW40+ standard can be achieved and only the storage system and visualization are missing—i.e. photovoltaic, controlled mechanical ventilation with heat recovery would be implemented regardless of the subsidy, and the building already meets KFW40 insulation standards (which should be quite easy with timber construction)—and there are two residential units, then the storage system becomes worthwhile because it is practically free.
L
laien.haft17 Dec 2016 14:54Alex85 schrieb:
No, but the profitability of the storage system largely depends on it being charged and discharged as often as possible during its (short) lifespan. This does not happen if, for example, the size of the photovoltaic system is too small or if there are other large consumers (heat pump, electric vehicle), meaning self-consumption is already quite good even without storage.
I’ll link myself:
https://www.hausbau-forum.de/threads/hat-sich-schon-jemand-mit-dem-sog-store-paket-der-fa-solarwatt-befasst.16947/#post-159294
If KFW 40+ standard can be reached and only the storage system and visualization are missing, i.e. photovoltaic, controlled residential ventilation with heat recovery would also be implemented without subsidies, and the building already meets KFW 40 insulation standards (probably very easy with timber construction), plus two residential units are added – then the storage system is worthwhile because it is practically free.... I’m late to this, but better late than never:If a small business is registered according to §19 UStG, value-added tax on self-consumption is waived.
If no small business is registered, input tax on the system costs can be reclaimed, but value-added tax on self-consumption applies.
The statement about coupling photovoltaic systems, battery storage, and battery electric vehicles is not entirely accurate or is at best too generalized, but I won’t go into more detail here.
Have a nice day.
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