ᐅ Is it practical to install a photovoltaic system on the west or east side of a building?
Created on: 5 Jan 2020 18:42
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kaho674
Hello,
we are wondering whether we should install a photovoltaic system on the roof in the near future. The empty conduits for it are already in place. However, we have a hipped roof. On the south side, there is just over 20m² (215 sq ft) available for the system. Would it make sense to also use the west (or east) side to increase the area, even if the sun doesn’t hit it at the optimal angle?
we are wondering whether we should install a photovoltaic system on the roof in the near future. The empty conduits for it are already in place. However, we have a hipped roof. On the south side, there is just over 20m² (215 sq ft) available for the system. Would it make sense to also use the west (or east) side to increase the area, even if the sun doesn’t hit it at the optimal angle?
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hampshire15 Jan 2020 10:06If photovoltaic systems are considered purely as a financial instrument, they can play a good role in an investment portfolio as a safe asset—just like other types of investments. This modern, oversimplified either-or thinking seems to be a common pastime upon closer examination.
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boxandroof15 Jan 2020 10:07hampshire schrieb:
Now the calculation without subsidies at an electricity price of 30 cents per kWh: Two comments from me regarding the calculation:
1) The high self-consumption is a special case.
2) According to the calculation, the storage system saves €70 per year at a one-time cost of €1500. From today's perspective, this excludes any payback of the storage system. The storage is only subsidized by the photovoltaic system and worsens both the account balance and the environmental footprint (production, storage losses). A lot still needs to change before a storage system becomes cost-effective. Whether a home needs an electricity storage system is another question altogether.
@ntsa86 Sorry, I can’t say anything about that yet.
My system was completed in December. It was commissioned and officially reported as operational in January, and I am still waiting for the installation of the bidirectional meter and generation meter.
However, I expect a self-consumption rate of 50% or more. That is quite high for the average user, but two households are connected to our photovoltaic system. In both households, the women are at home either full-time or from 2 p.m. onwards. This means I can actually schedule every load of laundry, every dryer cycle, and every dishwasher run during the sun hours. Additionally, I sometimes run a dehumidifier in the basement during summer, which I can, of course, set on a timer to operate during daylight hours. In one household, no electricity is needed for cooking during the heating season because there is a wood stove.
For all these reasons, I expect to achieve a self-consumption rate of over 50% even without a battery storage system.
My system was completed in December. It was commissioned and officially reported as operational in January, and I am still waiting for the installation of the bidirectional meter and generation meter.
However, I expect a self-consumption rate of 50% or more. That is quite high for the average user, but two households are connected to our photovoltaic system. In both households, the women are at home either full-time or from 2 p.m. onwards. This means I can actually schedule every load of laundry, every dryer cycle, and every dishwasher run during the sun hours. Additionally, I sometimes run a dehumidifier in the basement during summer, which I can, of course, set on a timer to operate during daylight hours. In one household, no electricity is needed for cooking during the heating season because there is a wood stove.
For all these reasons, I expect to achieve a self-consumption rate of over 50% even without a battery storage system.
I finally took the plunge and ordered a 25.6 kWp system. It is scheduled to be commissioned in April.
In mid-March, the cabinet plans to discuss the future of the cap again and, if necessary, approve a transitional solution.
According to the current expansion status, the cap is expected to be reached no earlier than May. Factors such as the current weather conditions and supply chain issues (coronavirus) are slowing down the expansion for now.
Is it still worth it? Given the current price level (around 1,000€/kWp), definitely.
@kaho674 if you want, I’m happy to share my calculations and local suppliers.
In mid-March, the cabinet plans to discuss the future of the cap again and, if necessary, approve a transitional solution.
According to the current expansion status, the cap is expected to be reached no earlier than May. Factors such as the current weather conditions and supply chain issues (coronavirus) are slowing down the expansion for now.
Is it still worth it? Given the current price level (around 1,000€/kWp), definitely.
@kaho674 if you want, I’m happy to share my calculations and local suppliers.
We have since had a conversation with a provider. It was quite disappointing. They only offered systems with storage and cloud options. The feed-in tariff (which is already very low) would expire before we connected to the grid. So, without storage, the electricity would essentially be given away. However, the storage alone costs 10,000.
We are now skeptical about this. If nothing changes from the government’s side, we won’t be able to afford it.
We are now skeptical about this. If nothing changes from the government’s side, we won’t be able to afford it.
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