ᐅ A photovoltaic system that pays for itself and breaks even on a monthly basis
Created on: 19 Nov 2019 07:35
G
Golfi90
Hello everyone…
Is it possible, in general terms, to install a photovoltaic system on a roof that pays for itself every month?
In other words, does it generate enough electricity so that a loan taken out for the system is covered by the savings on our electricity bills?
What is the current cost per square meter for a photovoltaic system, including installation and everything else? And how much electricity can it produce if installed on a south-east hip roof with a 28° pitch?
I have absolutely no idea about the amounts involved—both the cost of such a system and the electricity it generates.
We would probably need to install a battery as well… I also don’t know what that would cost.
A few experiences would be great, possibly even with concrete financing tips or personal stories.
Is it possible, in general terms, to install a photovoltaic system on a roof that pays for itself every month?
In other words, does it generate enough electricity so that a loan taken out for the system is covered by the savings on our electricity bills?
What is the current cost per square meter for a photovoltaic system, including installation and everything else? And how much electricity can it produce if installed on a south-east hip roof with a 28° pitch?
I have absolutely no idea about the amounts involved—both the cost of such a system and the electricity it generates.
We would probably need to install a battery as well… I also don’t know what that would cost.
A few experiences would be great, possibly even with concrete financing tips or personal stories.
There are two households.
In both, the women are at home around midday, so the washing machine, dryer, and dishwasher can all be scheduled for that time.
One apartment has a wood stove. In winter, cooking is usually never done with electricity there, and the electric kettle for tea is not needed either.
About 8% of the consumption comes from two dehumidifiers running in the basement during the summer months to maintain a good level of humidity. I can set these to operate around midday using a timer.
As you can see, there are several factors on our side that support the idea that 50% is quite realistic, so I have based my calculations on that.
In both, the women are at home around midday, so the washing machine, dryer, and dishwasher can all be scheduled for that time.
One apartment has a wood stove. In winter, cooking is usually never done with electricity there, and the electric kettle for tea is not needed either.
About 8% of the consumption comes from two dehumidifiers running in the basement during the summer months to maintain a good level of humidity. I can set these to operate around midday using a timer.
As you can see, there are several factors on our side that support the idea that 50% is quite realistic, so I have based my calculations on that.
Specki schrieb:
There are two households.
In both, the women are home around midday, so the washing machine, dryer, and dishwasher can all be scheduled for that time.
One apartment has a wood stove. So in winter, cooking with electricity and using the electric kettle for tea is usually not necessary.
About 8% of the consumption comes from two dehumidifiers running in the basement during the summer months to keep the humidity at a good level. I can set these on a timer for midday as well.
As you can see, there are several factors in our case that suggest 50% self-sufficiency is quite realistic, so that’s what I assumed for myself. Except for the dehumidifiers, the described setup does not differ from the 30% self-sufficiency figure. To my knowledge, 30% is already the maximum with the woman home at midday and running the dryer and washing machine.
With my electric car but no battery storage, I expected a maximum of 40%.
But that’s irrelevant. It was still a good decision regarding the photovoltaic system.
Interesting calculation. Thanks for that. I find the cost per kWp quite expensive for such a large system. Isn’t it already in the lower nine-hundreds range? Are those full black modules?
I’ll be able to tell you in a year whether my assumption was correct.
If an electric car arrives in a few years, the situation will definitely look much better since it is usually at home during the day. This way, I can probably cover about 90% of the electricity needed for the car with my photovoltaic system.
By the way, you don’t always have to quote the entire previous post.
Regards
Specki
If an electric car arrives in a few years, the situation will definitely look much better since it is usually at home during the day. This way, I can probably cover about 90% of the electricity needed for the car with my photovoltaic system.
By the way, you don’t always have to quote the entire previous post.
Regards
Specki
Zaba12 schrieb:
I find the cost per kWp in euros quite expensive for such a large system. Isn’t it usually already below 900 euros per kWp? The offer is reasonable; it also depends on the configuration. We are planning a 26.3 kWp (26.3 kW) system ourselves and have only received two offers in this region. One based on SolarEdge is priced at €940 per kWp (€940 per kW), and one based on SMA is €900 per kWp (€900 per kW) (both from the same provider). All other quotes we obtained are above €1000 per kWp (€1000 per kW).
Zaba12 schrieb:
I find the cost per kWp/€ quite high for such a large system. Shouldn’t it already be in the lower 900 range? Are these full black modules? Sorry, I must have missed that.
The house was built in 1964 and has a mortar ridge. This ridge will be completely replaced with a dry ridge, as it’s no longer in very good condition and will likely deteriorate further due to the movement of the tiles.
In addition, there will be a snow guard on one side of the house, about 16 m (52 feet) long.
If you estimate these two items at around €2,000, the price comes to about €886 per kWp.
Since both are carried out by the solar installer and also due to the photovoltaic system, I included them in my profitability calculation.
Regards
Specki
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