As part of our new build, we plan to install a photovoltaic system on the roof. The roof area is approximately 160sqm (1,720 sq ft), with a pitch of 25 degrees, a gable roof with one side facing northeast and the other southwest. Since we are both civil servants and income from photovoltaic systems requires approval and may later be counted towards our pension, feed-in is not an option for us.
The system is intended solely to reduce our electricity consumption. We will have a ground-source heat pump with a borehole, a 300l (80 gallons) hot water storage tank, and a ventilation system for heating. The house is designed to meet KFW 55 standard (higher efficiency is no longer possible due to the basement).
Since I am home starting at midday, appliances such as the washing machine, dryer, dishwasher, and others will mainly be used during the day.
Additionally, we live in an area with above-average sunshine and fewer cloudy days, even in winter.
We do not want a battery storage system yet, even though this means we will occasionally export surplus electricity. Once batteries become more affordable, we plan to add one later.
How should the system be sized for our needs?
The system is intended solely to reduce our electricity consumption. We will have a ground-source heat pump with a borehole, a 300l (80 gallons) hot water storage tank, and a ventilation system for heating. The house is designed to meet KFW 55 standard (higher efficiency is no longer possible due to the basement).
Since I am home starting at midday, appliances such as the washing machine, dryer, dishwasher, and others will mainly be used during the day.
Additionally, we live in an area with above-average sunshine and fewer cloudy days, even in winter.
We do not want a battery storage system yet, even though this means we will occasionally export surplus electricity. Once batteries become more affordable, we plan to add one later.
How should the system be sized for our needs?
You already have the limit set at 70%, so the 60/50% depending on the program should be no problem due to the storage system.
Besides, I am not referring to the small amount in the KfW 2xx program but to the 5,000€ (about 5,400 USD) from KfW 40+ in program 153; with two residential units, that’s already 10,000€ (about 10,800 USD)…
Also, the interest rates in the 2xx program are almost a giveaway and are below the current inflation rate, plus they are tax-deductible.
Besides, I am not referring to the small amount in the KfW 2xx program but to the 5,000€ (about 5,400 USD) from KfW 40+ in program 153; with two residential units, that’s already 10,000€ (about 10,800 USD)…
Also, the interest rates in the 2xx program are almost a giveaway and are below the current inflation rate, plus they are tax-deductible.
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Evolution14813 Apr 2017 12:59You can get €5000 anyway with KfW55. However, the additional subsidy for 40+ is not worth it either, as the extra costs are not proportional to the funding, even though current 55-standard buildings already meet almost 40-standard levels except for a few details in insulation. What use is a €5000 subsidy if comfort features like air conditioning are lost and the house becomes tens of thousands of euros more expensive? For such a minimal difference, you could really heat for a long time.
That is precisely why it can be worthwhile when a lot of “already planned” elements can be included, for example when a controlled ventilation system is desired anyway. Or when building services equipment is used for multiple residential units, so that subsidies can, for instance, double in the case of a granny flat.
Hello everyone,
Since our house (town villa) with a hip roof was completed and ready to move into in 2015, we have now also started looking into photovoltaic systems with storage.
In total, we have planned 29 photovoltaic panels (9 on the south roof + 10 on the west roof + 10 on the east roof) with a total capacity of 8.12 kWp.
Additionally, we are considering the SMA Sunny TriPower 7000 TL-20 inverter and a Mercedes battery storage system with 7.5 kWh (7.5 kWh) capacity.
This setup sounds reasonable to us, so we want to discuss our plans with our house bank soon and arrange financing over 15 years. There may also be a subsidy available for the battery storage through KfW, but we would need to coordinate this with the bank and KfW directly.
Does anyone have a similar system and can share their experience?
Best regards,
Martin
Since our house (town villa) with a hip roof was completed and ready to move into in 2015, we have now also started looking into photovoltaic systems with storage.
In total, we have planned 29 photovoltaic panels (9 on the south roof + 10 on the west roof + 10 on the east roof) with a total capacity of 8.12 kWp.
Additionally, we are considering the SMA Sunny TriPower 7000 TL-20 inverter and a Mercedes battery storage system with 7.5 kWh (7.5 kWh) capacity.
This setup sounds reasonable to us, so we want to discuss our plans with our house bank soon and arrange financing over 15 years. There may also be a subsidy available for the battery storage through KfW, but we would need to coordinate this with the bank and KfW directly.
Does anyone have a similar system and can share their experience?
Best regards,
Martin
T
toxicmolotof17 May 2017 18:25His memory will be completely overwhelmed. Guaranteed. It's still not worth it.
toxicmolotow schrieb:
He will have the buffer tank ripped apart. Guaranteed. It's still not worth it.Yep, probably the same goes for the conditions, the arrangement on the three roofs, and the wiring. But that’s exactly what the offer forum is good for. I’ll use it too when we get to that point.
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