ᐅ Hillside House in the Southwest Palatinate – Our Home Construction 2.0
Created on: 9 Sep 2022 18:13
K
kati1337
Good evening everyone
I’m starting a small collection thread here for photos and progress updates on our second building project.
We’ve already moved to the Palatinate region to be closer to the construction site. Now we’re watching eagerly and happily as our (hopefully final) dream home takes shape near family.
One big challenge still ahead of us is the facade design. I really love the Nordic style with brickwork and mullioned windows. That won’t be possible here for two reasons: firstly, no one here can do bricklaying, and secondly, it would stand out too much. We will be going with a rendered facade. How to design the colors of the facade and windows to still create some country house / cottage charm is currently still a work in progress mentally.
Otherwise, I’m sharing our plans here and how it will eventually be built.
The support pillar marked near the kitchen island could be removed for a small extra cost, so that will be gone.
The room for “garden equipment” under the garage will get a partition wall for structural reasons.
It won’t be fully finished living space like in the house, but underfloor heating will be installed, along with a lockable door and a window. It’s meant to store garden tools but also some of the building services equipment, since the utility room (HAR) is quite small, and maybe be used as a party room.
We had three construction companies in the final selection. In the end, we chose the “doer” – a builder recommended to us here by friends and family. No website, no smartphone, but he is on site every day himself working in overalls. He has a very good reputation in this area and now rarely builds single-family homes. We were a bit lucky through personal connections and a very friendly initial phone call to get our foot in the door. So far we are very satisfied with this choice.
I’m starting a small collection thread here for photos and progress updates on our second building project.
We’ve already moved to the Palatinate region to be closer to the construction site. Now we’re watching eagerly and happily as our (hopefully final) dream home takes shape near family.
One big challenge still ahead of us is the facade design. I really love the Nordic style with brickwork and mullioned windows. That won’t be possible here for two reasons: firstly, no one here can do bricklaying, and secondly, it would stand out too much. We will be going with a rendered facade. How to design the colors of the facade and windows to still create some country house / cottage charm is currently still a work in progress mentally.
Otherwise, I’m sharing our plans here and how it will eventually be built.
The support pillar marked near the kitchen island could be removed for a small extra cost, so that will be gone.
The room for “garden equipment” under the garage will get a partition wall for structural reasons.
It won’t be fully finished living space like in the house, but underfloor heating will be installed, along with a lockable door and a window. It’s meant to store garden tools but also some of the building services equipment, since the utility room (HAR) is quite small, and maybe be used as a party room.
We had three construction companies in the final selection. In the end, we chose the “doer” – a builder recommended to us here by friends and family. No website, no smartphone, but he is on site every day himself working in overalls. He has a very good reputation in this area and now rarely builds single-family homes. We were a bit lucky through personal connections and a very friendly initial phone call to get our foot in the door. So far we are very satisfied with this choice.
kati1337 schrieb:
Back then, we consumed over 60% of the energy ourselves, and that without any storage. A colleague has been regularly bothering me with screenshots of his energy self-sufficiency, so I recalculated it.
Total consumption in 2022 with heat pump and electric car: 8.7 MWh
Grid consumption in 2022: 6.1 MWh
If I now assume being completely self-sufficient for the entire period from March through November inclusive, I would save a maximum of €1048 per year.
Probably significantly less, since 1. the storage system is rarely fully charged during transitional periods, never empty in summer, and I didn’t factor in missed savings.
For you, it would take only 8 years to break even. If you include interest, it would be longer. So you might as well participate – the money spent on the garage door is never recovered anyway 😉
For me, it doesn’t pay off because I would also need a new inverter. Unfortunately.
OWLer schrieb:
A colleague has been regularly teasing me with screenshots of his energy self-sufficiency, so I recalculated it myself.
Total consumption in 2022 with heat pump and electric car: 8.7 MWh
Grid supply in 2022: 6.1 MWh
If I now assume being completely self-sufficient from March through November, the maximum yearly savings would be around €1048.
Probably significantly less, since 1. the battery rarely gets fully charged during the transition periods, never empties in summer, and I didn’t account for lost savings.
For you, that would mean only 8 years until the investment pays off. If you include interest, it would take longer. So you might as well join in now—the money spent on the garage door never returns 😉
For me, it doesn’t pay off, since I would need a new inverter as well. Unfortunately. That roughly matches our calculation. We have currently assumed €7800 for the battery alone – he gave us a discount of about €2000, which I should partly assign to the battery as well.
If I now assume 200 charge cycles per year for the battery (is that realistic?), with a capacity of 12.8 kWh, I get 12.8 * 200 = 2560 kWh of saved grid consumption. Calculated with the current electricity price, that would be 2560 x €0.4 = €1024 savings per year.
€7800 / €1024 = about 7.6 years until the battery pays for itself.
The warranty is 10 years.
This assumes that electricity won’t get cheaper than €0.4/kWh. If it became more expensive, that would improve the return on investment.
For simplicity, I have ignored losses. They should definitely be considered—what would be the approximate amount?
Hello,
Your calculation doesn’t quite add up.
You can estimate charging/discharging losses at about 5% each way. So, for your 2560 kWh saved, you actually had to feed in 2816 kWh prior, for which you receive no feed-in tariff. That means you give up earnings of €0.075 x 2816 = €211. And you save 2560 kWh x €0.33 = €844. Overall, not €1024 savings but only €633. Now, if you factor in an interest rate of 3% on your €7800 purchase price (which you could almost get as a saving account interest), that’s another €234 less.
This leaves you with savings of about €400 on a €7800 investment. Your return on investment (ROI) is therefore not 7.6 years but 19.5 years!
And that’s assuming the storage system operates at full capacity for that long, which seems rather unlikely...
In forums related to photovoltaic systems, the common opinion is that storage is usually not economically viable, and it’s better to invest the saved money into expanding the solar array on the roof.
Best regards,
Andreas
Your calculation doesn’t quite add up.
kati1337 schrieb:
If I assume 200 charge cycles per year for the storage system (is that realistic?), then with 12.8 kWh it’s 12.8 * 200 = 2560 kWh saved from the grid. Applying the current electricity price, that would be 2560 x €0.40 = €1024 savings per year.
€7800 / €1024 = about 7.6 years until the storage pays for itself.
It comes with a 10-year warranty.
This is based on the assumption that electricity won’t get cheaper than €0.40. If it gets more expensive, that would improve the payback.
To simplify, I left out losses. Those definitely need to be considered—what would be a rough estimate?
You can estimate charging/discharging losses at about 5% each way. So, for your 2560 kWh saved, you actually had to feed in 2816 kWh prior, for which you receive no feed-in tariff. That means you give up earnings of €0.075 x 2816 = €211. And you save 2560 kWh x €0.33 = €844. Overall, not €1024 savings but only €633. Now, if you factor in an interest rate of 3% on your €7800 purchase price (which you could almost get as a saving account interest), that’s another €234 less.
This leaves you with savings of about €400 on a €7800 investment. Your return on investment (ROI) is therefore not 7.6 years but 19.5 years!
And that’s assuming the storage system operates at full capacity for that long, which seems rather unlikely...
In forums related to photovoltaic systems, the common opinion is that storage is usually not economically viable, and it’s better to invest the saved money into expanding the solar array on the roof.
Best regards,
Andreas
andimann schrieb:
Hello,
Your calculation isn’t quite right.
You can estimate charging and discharging losses at roughly 5% each way. So, for your 2560 kWh, you actually need to supply 2816 kWh beforehand, for which you don’t receive any feed-in tariff. That means you lose 7.5 cents times 2816, which equals 211 euros. On the other hand, you save 2560 kWh times 0.33 cents, which is 844 euros. So the total saving is not 1024 euros but only 633 euros. Now, if you add an interest rate of 3% on the 7800 euro purchase price for the battery (which you could almost get from a savings account), that’s another 234 euros less.
That leaves you with a saving of 400 euros on an investment of 7800 euros. Your return on investment (ROI) is therefore not 7.6 years but 19.5 years! And that’s only assuming the battery lasts at full capacity for that long, which is rather unlikely…
In forums about photovoltaic systems, the general opinion is that batteries are usually not economically worthwhile, and it is better to invest the saved money into expanding the solar array.
Best regards,
AndreasDo I really have to deduct it twice? So the lost feed-in tariff of €0.08 currently, yes, that has to be offset. But considering only a savings of 33 cents seems like double counting, or am I missing something? If I were to draw the electricity from the grid instead of the battery, wouldn’t I pay 40 cents, not 33?
I have also read the forums you mentioned, but they sometimes refer to very different prices than 7,800 euros for a 12.8 kW battery.
Jasmin schrieb:
Hello, what roof orientation do you have (gable roof, right)?
Two years ago, we decided to cover the entire roof and not to include the attic. Looking back, unfortunately, we have a hip roof. The main orientation of our roof is east-west.
Did you also get an offer for a complete coverage of your roof? No, we do not have a gable roof. The current layout is planned with the offered system as follows:
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