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.
Sascha aus H22 Nov 2016 20:10It only makes sense if you want to generate a large part of your own electricity consumption to combine photovoltaic panels with a related storage system. The problem, however, is that both together are too expensive—in other words, you end up paying more per kilowatt-hour generated and stored than if you were to get it from the grid.
Whether it is economically worthwhile over the long term (since both storage systems and photovoltaic installations eventually need replacement) depends on the electricity price you expect in the future. The general consensus here is that, from an economic perspective, it is not worthwhile today and that prices would have to "skyrocket" for it to make sense.
Whether it is economically worthwhile over the long term (since both storage systems and photovoltaic installations eventually need replacement) depends on the electricity price you expect in the future. The general consensus here is that, from an economic perspective, it is not worthwhile today and that prices would have to "skyrocket" for it to make sense.
One kWh of self-generated electricity, stored in a battery system and then used again, costs at least 40 cents. Usually more.
Photovoltaics alone can definitely be profitable. Consuming your own electricity is more beneficial than feeding it into the grid, so it generally makes sense to store energy. However, with the technologies currently available, this is not cost-effective today.
Photovoltaics alone can definitely be profitable. Consuming your own electricity is more beneficial than feeding it into the grid, so it generally makes sense to store energy. However, with the technologies currently available, this is not cost-effective today.
G
Goldi0911122 Nov 2016 22:35I am currently also considering using a gas condensing boiler combined with photovoltaic panels instead of a gas condensing boiler and solar thermal system, with the option to add a storage unit later (possibly in 10 years). I think this “pays off” more than solar thermal... at least, that’s my gut feeling about the return on investment.
On the other hand, I seriously wonder how a family of three can consume 3,500 kWh in a single apartment?
On the other hand, I seriously wonder how a family of three can consume 3,500 kWh in a single apartment?
With a gas condensing boiler combined with photovoltaic (PV) panels, the question arises how to meet the energy savings regulation requirements regarding the renewable share of heat generation. To incorporate photovoltaics effectively, for example, a buffer tank with an electric heating element is needed. Using the PV electricity directly for heating, basically an "immersion heater," seems to me to be a waste, as solar thermal systems are more efficient for this purpose.
A mechanical ventilation system with heat recovery can provide the renewable share.
Photovoltaics combined with a heat pump appears to be a good combination.
A mechanical ventilation system with heat recovery can provide the renewable share.
Photovoltaics combined with a heat pump appears to be a good combination.
Goldi09111 schrieb:
On the other hand, I seriously wonder how a three-person family uses 3,500 kWh (in an apartment?).Quite simple: an older freezer, regular cooking and baking, an aquarium or terrarium, a child who often forgets to turn off the lights, various devices on standby (TV, receiver, gaming console, ...), use of a dryer...
And just like that, you quickly reach 3,900 kWh. So it’s not surprising at all.
S
Steffen8023 Nov 2016 08:34Goldi09111 schrieb:
On the other hand, I seriously wonder how a family of three can consume 3,500 kWh (in an apartment?). Oh, wonder of wonders 🙂 Some even manage 7,500 kWh with just two people.. okay, last year we used 8,500 kWh with three of us.
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