ᐅ Photovoltaic System for 120 sqm of Living Space – Should the Entire Roof Be Covered?
Created on: 25 Oct 2021 23:00
K
Kalibri
Hello everyone,
I am currently looking into expanding our planned photovoltaic system.
The standard total capacity is 3.75 kWp. I have been considering upgrading it to 5 kWp.
Now, browsing through the forum, I see many examples with 10 kWp and more.
Of course, it makes sense to cover the roof as much as possible, but the price is an important factor for us.
There are two of us living in a 120 sqm (1292 sq ft) home.
What are your experiences with achieving the best possible balance between cost and performance?
I am currently looking into expanding our planned photovoltaic system.
The standard total capacity is 3.75 kWp. I have been considering upgrading it to 5 kWp.
Now, browsing through the forum, I see many examples with 10 kWp and more.
Of course, it makes sense to cover the roof as much as possible, but the price is an important factor for us.
There are two of us living in a 120 sqm (1292 sq ft) home.
What are your experiences with achieving the best possible balance between cost and performance?
A storage system is currently only economical with subsidies.
The ratio of photovoltaic (PV) system size to storage capacity should be roughly between 1.2 and 1.6.
For a 5 kWh storage system, this means at least a 6 kWp PV system, preferably 7–8 kWp.
In my opinion, a 3 kWp PV system is not economically viable. That corresponds to about 8–9 modules.
The cost for the modules alone is around 1,000, plus inverter, installation and connection at least 4,000.
An 8 kWp system should cost you around 9,000–10,000 net.
The ratio of photovoltaic (PV) system size to storage capacity should be roughly between 1.2 and 1.6.
For a 5 kWh storage system, this means at least a 6 kWp PV system, preferably 7–8 kWp.
In my opinion, a 3 kWp PV system is not economically viable. That corresponds to about 8–9 modules.
The cost for the modules alone is around 1,000, plus inverter, installation and connection at least 4,000.
An 8 kWp system should cost you around 9,000–10,000 net.
We are about to start building and have decided on a 13.29 kWp system. This will fully cover the two most powerful sides of the roof. The costs are manageable, around €16,200 (gross). You can reclaim the value-added tax, so the net cost comes to approximately €13,620, which is about €1,000 per kWp.
The purchase of the battery storage depends on subsidies available in each country. In Brandenburg, there are none, so initially, no battery storage will be installed.
The purchase of the battery storage depends on subsidies available in each country. In Brandenburg, there are none, so initially, no battery storage will be installed.
Hello,
also consider including the east/west-facing areas in your planning and possibly equipping them with modules.
For example, I have installed modules on all three sides—east, west, and south—and reached just over 13 kWp.
I also got a storage system because I received a subsidy (Brandenburg).
Otherwise, profitability is usually quite low. Now I am very satisfied, as it powers me throughout the entire night until early morning.
It also “heats/feeds” my air-to-water heat pump during the night.
also consider including the east/west-facing areas in your planning and possibly equipping them with modules.
For example, I have installed modules on all three sides—east, west, and south—and reached just over 13 kWp.
I also got a storage system because I received a subsidy (Brandenburg).
Otherwise, profitability is usually quite low. Now I am very satisfied, as it powers me throughout the entire night until early morning.
It also “heats/feeds” my air-to-water heat pump during the night.
Mahri23 schrieb:
Hello,
also consider including the east/west surfaces in your planning and possibly equip them with panels.
For example, I have panels on all three sides: east/west and south, and I reached just over 13 kWp.
I also got a battery storage system because I received a subsidy (Brandenburg).
Otherwise, the cost-effectiveness is rather low. Now I am very satisfied, as it supplies me throughout the entire night until early morning.
It also "heats/feeds" my air-to-water heat pump during the night. That was the old subsidy, which unfortunately expired several months ago. I hope a new subsidy will be available from the new year, then I will also buy a battery storage system.
An American car manufacturer from Grünheide has announced a dynamic electricity tariff, initially available only in combination with its storage system.
No longer fixed at 7 cents / 32 cents, but more affordable for the customer.
This could be the beginning of dynamic electricity tariffs and reimbursements ranging from 1 to 20 cents, depending on the time of day or electricity market trends.
This would completely change the calculation of economic feasibility.
No longer fixed at 7 cents / 32 cents, but more affordable for the customer.
This could be the beginning of dynamic electricity tariffs and reimbursements ranging from 1 to 20 cents, depending on the time of day or electricity market trends.
This would completely change the calculation of economic feasibility.
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