Tarnari
2020-05-23 00:10:32
- #1
I didn't have that on my list. Mea Culpa. Our goal is 08/2020He "plans" construction start 2021, because no installer is doing anything today
Photovoltaic system: Costs, saving potential? - Experiences?
- Erstellt am 2020-01-16 10:50:38
kati1337
2020-06-05 13:34:38
- #2
I’m sharing with you our calculation for the photovoltaic system. We are getting this version. Assumptions we based it on (and of course don’t know for sure): - Consumption values for our electricity demand, air-water heat pump + ventilation combo unit, air conditioning. - Assumption that the electricity price will continue to rise by about 2.7% p.a. (based on the statistics of recent years). - Self-consumption of 45% determined using an online calculator - 2% operating costs flat rate, which is quite optimistically calculated.
As you can see, we reach a break-even somewhere around year 16. The calculation still neglects the potential tax burden. If you include that (I wasn’t quite sure how), it can also turn out less favorable. Why we’re doing it anyway: - We expect the electricity price to rise more sharply in the coming years than before (our personal opinion) - We hope that through the continuous operation of the air-water heat pump also as a ventilation system and the synergy of photovoltaic + air conditioning, we reach a higher self-consumption than 45%. - We hope that the system can operate longer than 16 years with the assumed operating costs and then yield pure profit in the end.
Purely mathematically, as you can see, photovoltaic is no longer such a super deal as it might seem at first glance. But we’re doing it anyway with conviction.
As you can see, we reach a break-even somewhere around year 16. The calculation still neglects the potential tax burden. If you include that (I wasn’t quite sure how), it can also turn out less favorable. Why we’re doing it anyway: - We expect the electricity price to rise more sharply in the coming years than before (our personal opinion) - We hope that through the continuous operation of the air-water heat pump also as a ventilation system and the synergy of photovoltaic + air conditioning, we reach a higher self-consumption than 45%. - We hope that the system can operate longer than 16 years with the assumed operating costs and then yield pure profit in the end.
Purely mathematically, as you can see, photovoltaic is no longer such a super deal as it might seem at first glance. But we’re doing it anyway with conviction.
nordanney
2020-06-05 13:53:22
- #3
As you can see, we break even somewhere in year 16.
Well, at that price for the system, the solar installer is the one really lining their pockets. The price is a no-go and completely exaggerated. I am currently planning a system just under 10 kWp and have prices between €1,150 and €1,350, so for 2.5 times the size between €11,500 and €13,500.
kati1337
2020-06-05 13:54:28
- #4
Well, at the price of the system, the solar installer is the person who really fills their pockets. The price is a no-go and completely excessive. I am currently planning a system just under 10 kWp and have prices between €1,150 and €1,350, so for 2.5 times the size between €11,500 and €13,500.
That is probably our fault because we had it included directly by the main contractor. If we had commissioned that separately, it would certainly have become cheaper. But hindsight is always 20/20.
guckuck2
2020-06-05 13:57:08
- #5
Thoughts on the table
- first error already in household electricity consumption. Where are 4000+2800+400 = 8000?
- electricity price 2020 is said to be 0.26 cents, four columns to the right it says 0.24 working price. Huh?
- acquisition costs 9280€ for 4.2 kWp absolutely overpriced (biggest false assumption in the calculation imho). The system should cost in the range of 4600-4800€ net. Or is a storage system included that spoils the balance?
- the photovoltaics are simply too small for household consumption. The self-consumption share should therefore be relatively high. On the other hand, a storage system is particularly uneconomical, if planned.
- all taxes were forgotten. In the case of self-consumption, the VAT is missing, which negatively affects profitability. On the other hand, this only applies for 5 years (after that REDUCTION). In the other direction, the depreciation acts, which is ignored (especially with the high system price)
Ergo, start all over again.
EDIT:
Oh, that has already been commissioned?! Then the biggest mistake has already been made (moon price). Now you have to make the best of it.
To the other builders, do not commission this with the general contractor! With bad luck, they will not issue a separate invoice (= no VAT back on the acquisition). Photovoltaics can also be easily prepared with 1-2 empty conduits and then commissioned separately.
- first error already in household electricity consumption. Where are 4000+2800+400 = 8000?
- electricity price 2020 is said to be 0.26 cents, four columns to the right it says 0.24 working price. Huh?
- acquisition costs 9280€ for 4.2 kWp absolutely overpriced (biggest false assumption in the calculation imho). The system should cost in the range of 4600-4800€ net. Or is a storage system included that spoils the balance?
- the photovoltaics are simply too small for household consumption. The self-consumption share should therefore be relatively high. On the other hand, a storage system is particularly uneconomical, if planned.
- all taxes were forgotten. In the case of self-consumption, the VAT is missing, which negatively affects profitability. On the other hand, this only applies for 5 years (after that REDUCTION). In the other direction, the depreciation acts, which is ignored (especially with the high system price)
Ergo, start all over again.
EDIT:
Oh, that has already been commissioned?! Then the biggest mistake has already been made (moon price). Now you have to make the best of it.
To the other builders, do not commission this with the general contractor! With bad luck, they will not issue a separate invoice (= no VAT back on the acquisition). Photovoltaics can also be easily prepared with 1-2 empty conduits and then commissioned separately.
kati1337
2020-06-05 13:58:29
- #6
Oh yes, we also had a second offer for 7.2kwp and 14,400, also through the GU. But we did not accept that. #
That makes even less sense financially, because although we then have more panels on the roof, our self-consumption rate goes down. It only becomes really profitable if you use as much of the electricity yourself as possible and feed in little.
But that's not so easy, unless you consider a CHP/battery, but then it becomes disproportionately more expensive again, which doesn't pay off at all.
That makes even less sense financially, because although we then have more panels on the roof, our self-consumption rate goes down. It only becomes really profitable if you use as much of the electricity yourself as possible and feed in little.
But that's not so easy, unless you consider a CHP/battery, but then it becomes disproportionately more expensive again, which doesn't pay off at all.