ᐅ Waiving Feed-in Tariffs: Is It Always Feasible? Storage System Prices?
Created on: 18 Jul 2022 12:52
N
NBN2022
Hello everyone,
we are planning a small 5.7 kW peak system. We are still undecided about whether to include a battery storage or not. Through our installer, we have been offered a battery with 5.12 kW capacity for just under €10,000. That seems very expensive to me. Is it usually possible to get it cheaper if added later? Including installation?
My main question is this: assuming an annual electricity generation of 5,000 kWh, minus self-consumption (depending on whether there is a battery or not), there is not much left to sell back to the grid operator. Plus, the “effort” with the tax office... Despite simplifications for smaller systems, as far as I know you still have to handle the VAT return... We would gladly do without those few euros entirely if it means we are completely “off the hook” regarding the tax office. Is that possible?
Thank you very much for your help!
we are planning a small 5.7 kW peak system. We are still undecided about whether to include a battery storage or not. Through our installer, we have been offered a battery with 5.12 kW capacity for just under €10,000. That seems very expensive to me. Is it usually possible to get it cheaper if added later? Including installation?
My main question is this: assuming an annual electricity generation of 5,000 kWh, minus self-consumption (depending on whether there is a battery or not), there is not much left to sell back to the grid operator. Plus, the “effort” with the tax office... Despite simplifications for smaller systems, as far as I know you still have to handle the VAT return... We would gladly do without those few euros entirely if it means we are completely “off the hook” regarding the tax office. Is that possible?
Thank you very much for your help!
I mentioned it above: charging an electric car. There are definitely other major power consumers as well. Once I have my computer running again, it will also draw several hundred watts, at least when I’m gaming. We might still consider getting an air conditioning unit, which also uses a significant amount of power continuously.
And you could install one facing each direction to have more evenly distributed free electricity throughout the day...
And you could install one facing each direction to have more evenly distributed free electricity throughout the day...
i_b_n_a_n schrieb:
The only thing I don’t get is the point of running several of these. ONE balcony power system nicely covers the baseline power consumption from the refrigerator and other appliances, etc. But every additional balcony power system feeds energy in without compensation because it’s exempt from registration. Well, you just can’t always count on clear skies and sunshine. One or two extra modules might be “too much” in perfect weather but could be just enough to cover the baseline consumption on cloudy days.
You have to calculate what makes more sense. It might actually not be such a bad idea to feed in excess power for free on the few top-weather days and then, in contrast, produce just enough photovoltaic electricity on our fairly frequent cloudy days.
D
Deliverer19 Jul 2022 13:23A few basic rules of thumb for beginners:
- On cloudy days, you still get about 30% of the maximum output.
- On rainy days and cloudy winter days, output drops to around 10%.
- It’s often cloudy — something you only really notice when you check the solar monitoring app.
- Electric cars start charging at about 1.6 kW (inefficient).
- Average heat pumps draw between 200 and 2000 watts.
- More than half of the possible output, given the weather, typically occurs between 10 a.m. and 4 p.m.
- Often, you get less energy than expected, especially in the mornings and evenings when you usually want more.
- One year after installation, many regret not having installed a larger system right away.
- Solar power can be addictive.
Deliverer schrieb:
A few basic rules of thumb for beginners:
- On cloudy days, you still get about 30% of the maximum output.
- In rainy weather and on cloudy winter days, about 10%.
- It’s often cloudy – you only realize this when you check the photovoltaic app...
- Electric cars start charging inefficiently at around 1.6 kW.
- Average heat pumps draw between 200 and 2000 watts.
- More than half of the possible output, given the weather, is typically generated between 10 a.m. and 4 p.m.
- Often, the output is less than you expect, especially in the mornings and evenings when you always wish for more.
- A year after commissioning, you regret not having installed a larger system right away.
- Photovoltaics are addictive.
I’d like to add:
- The stove quickly draws between 1000 and 2000 watts.
- The dryer quickly draws between 1000 and 2000 watts.
We have 395-watt modules totaling just under 10 kWp capacity. In the mornings, we hover around 600 watts, even though the sun is almost shining directly on them. During the day, 6000 to 8000 watts feed into the grid, but in the evening it quickly drops back down to about 600 watts. These are our figures with the current sunny weather and a southeast orientation.
During the day, the washing machine and dryer are running. If the stove is also on, the power gets tight. The house has a baseline load of about 400 watts.
You can imagine how it will be in winter or on cloudy days. As @Deliverer says: you end up regretting having installed such a small system.
Thank you for your many responses! So, to summarize: I can voluntarily waive the feed-in tariff. I assume I would notify the utility company about this. Then I would give away my surplus energy.
Do you have any opinions on storing surplus energy in a battery or in the cloud? There seem to be various views on this... I find the idea of the cloud very appealing. However, I am a complete beginner in this field.
Do you have any opinions on storing surplus energy in a battery or in the cloud? There seem to be various views on this... I find the idea of the cloud very appealing. However, I am a complete beginner in this field.
D
Deliverer20 Jul 2022 13:07Storage has already been addressed; economically and environmentally, it currently does not make sense. You have to be willing to afford it, but it is possible.
And the "cloud" exists only in marketing. In reality, these are simply electricity supply contracts aimed at selling EVEN more expensive storage systems to customers while hiding the true costs. Many parties benefit from these offers, but not the customer.
So, the answer is no twice over, if money still matters.
And the "cloud" exists only in marketing. In reality, these are simply electricity supply contracts aimed at selling EVEN more expensive storage systems to customers while hiding the true costs. Many parties benefit from these offers, but not the customer.
So, the answer is no twice over, if money still matters.
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