ᐅ Photovoltaic Systems: Advantages, Disadvantages, Experiences, and Is It Worthwhile?
Created on: 9 Jul 2014 11:42
F
Fortuna86
Hello,
I would like to know your opinions on the topic of photovoltaic systems.
The plan is for a house with 140 sqm (1507 sq ft) with a south-facing roof.
Is financing such a system worthwhile?
What are your personal experiences in this area?
Do you have to feed the electricity into the grid, or is it allowed/possible to use it yourself?
Are there any special incentives or subsidies available?
What disadvantages does installing such a system have (please don’t mention “appearance”)?
I would like to know your opinions on the topic of photovoltaic systems.
The plan is for a house with 140 sqm (1507 sq ft) with a south-facing roof.
Is financing such a system worthwhile?
What are your personal experiences in this area?
Do you have to feed the electricity into the grid, or is it allowed/possible to use it yourself?
Are there any special incentives or subsidies available?
What disadvantages does installing such a system have (please don’t mention “appearance”)?
I’m currently considering getting a battery storage system.
It’s a bit unfortunate because it’s too late for subsidies now (just missed out on the €1,000 (about $1,100) grant, part of the 10,000 Homes Battery Storage Program), but it is what it is. I’ve had a Kostal Plenticore 8.5 Plus inverter installed already, just in case I decide to go for it, so now I only need the battery. My solar installer gave me a price yesterday: €3,750 (about $4,100) net plus installation for the BYD BOX HV 6.4 kWh (6.4 kilowatt-hour) version.
Question: My system on the south-facing roof is 8.68 kWp (kilowatt peak).
1. Does it make sense to get a BYD HV battery with 7.7 kWh (7.7 kilowatt-hour) capacity given the system size?
2. I usually get home between 4 and 6 p.m. and can currently charge my electric car (14 kWh battery capacity) for about 2 hours with approximately 3.1 kW from my system. After that, there’s naturally less photovoltaic energy until it gets dark. At some point, I start drawing electricity from the grid. It would be problematic if the car drains the battery until, say, 10 p.m. and the household loads overnight (controlled ventilation, refrigerator, water heating, etc.) require more than the car used!
Does having a battery make sense with the car? Or is increasing self-consumption with an additional battery disproportionate because of the electric vehicle? Without a battery (considering the car itself as storage), I expect a self-sufficiency rate over 40% (rough estimate).
...and please don’t tell me to just get a bigger battery.
It’s a bit unfortunate because it’s too late for subsidies now (just missed out on the €1,000 (about $1,100) grant, part of the 10,000 Homes Battery Storage Program), but it is what it is. I’ve had a Kostal Plenticore 8.5 Plus inverter installed already, just in case I decide to go for it, so now I only need the battery. My solar installer gave me a price yesterday: €3,750 (about $4,100) net plus installation for the BYD BOX HV 6.4 kWh (6.4 kilowatt-hour) version.
Question: My system on the south-facing roof is 8.68 kWp (kilowatt peak).
1. Does it make sense to get a BYD HV battery with 7.7 kWh (7.7 kilowatt-hour) capacity given the system size?
2. I usually get home between 4 and 6 p.m. and can currently charge my electric car (14 kWh battery capacity) for about 2 hours with approximately 3.1 kW from my system. After that, there’s naturally less photovoltaic energy until it gets dark. At some point, I start drawing electricity from the grid. It would be problematic if the car drains the battery until, say, 10 p.m. and the household loads overnight (controlled ventilation, refrigerator, water heating, etc.) require more than the car used!
Does having a battery make sense with the car? Or is increasing self-consumption with an additional battery disproportionate because of the electric vehicle? Without a battery (considering the car itself as storage), I expect a self-sufficiency rate over 40% (rough estimate).
...and please don’t tell me to just get a bigger battery.
KingSong schrieb:
Our setup is almost exactly the same as yours, just without air conditioning. My self-sufficiency for June 2019 was 95%, July 2019 91%, and August 2019 90%.
We have 9.2 kWp on the roof and a 10.5 kW battery storage.3.6 kWp south-facing, 1.8 kWp west-facing (5.4 kWp total)and an LG 7 kWh battery storage, which can be charged at about 6 kW. So roughly half of what you have. What did you pay?
W
WilhelmRo3 Sep 2019 08:56boxandroof schrieb:
188 kWh/16% self-consumedboxandroof schrieb:
approx. €50 savingsI thought that for self-consumption, you pay 15 cents per kWh instead of about 30 cents per kWh, so a 15-cent saving. That would be: 188 * 0.15 = €28
Did I make a mistake, or did you just estimate? 🙂
Best regards
Andre77 schrieb:
Anyone have a tip on how/where to get the KFW 270 as a standalone product?
Thanks! KFW for, for example, photovoltaic systems is available only from €100,000, for instance at Deutsche Bank.
KingSong schrieb:
Our setup is almost exactly like yours, just without air conditioning. My self-sufficiency for June 2019 is 95%, July 2019 is 91%, and August 2019 is 90%.
We have 9.2 kWp on the roof and a 10.5 kW battery storage. Those are the kind of numbers you can expect with a battery storage system; sounds good.
WilhelmRo schrieb:
I thought with self-consumption, you have to pay 15¢/kWh instead of around 30¢/kWh, so a savings of 15¢.
That would be: 188 * 0.15 = €28.
Am I mistaken or were you just estimating? : )
Best regards Why would you have to pay for self-consumption?
You’d just miss out on the feed-in tariff; maybe that’s what you mean.
B
boxandroof3 Sep 2019 09:111. I did not have to buy the 188 kWh (about €0.26).
2. In my case (no small business exemption), I have to pay 19% VAT on self-consumption for 5 years (using approximately €0.24/kWh as the basis) and permanently pay tax on the self-consumption (at €0.11/kWh). I probably do not pay income tax due to exemption thresholds for this type of income.
Of course, I lose the feed-in tariff for the self-consumed electricity.
Out of the €50, €40 remain.
2. In my case (no small business exemption), I have to pay 19% VAT on self-consumption for 5 years (using approximately €0.24/kWh as the basis) and permanently pay tax on the self-consumption (at €0.11/kWh). I probably do not pay income tax due to exemption thresholds for this type of income.
Of course, I lose the feed-in tariff for the self-consumed electricity.
Out of the €50, €40 remain.
@Lumpi_LE Thanks!
@others
How can you get the favorable interest rates if you didn’t mention KFW 270 right away during the property financing and probably didn’t apply for it? There must certainly be some who decided on a photovoltaic system after or during the construction.
@others
How can you get the favorable interest rates if you didn’t mention KFW 270 right away during the property financing and probably didn’t apply for it? There must certainly be some who decided on a photovoltaic system after or during the construction.
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