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.
Lumpi_LE schrieb:
Yeah, and you need that many days first. Just counted, I could have drawn more than 4 kWh from a battery on 18 days... For me, a 3 kWh battery would probably be enough, but the cost is barely any lower, so it’s not worth it at all.
A DIY solution could be an option; there are guides for a 2 kWh battery for 2000€, but even that doesn’t pay off. Only 18 days, oops? If I understand my meter correctly, I fed 2300 kWh back into the grid over the last 4 months alone. And those months weren’t even that great.
It’s not just about generating electricity, you also have to use it. In summer, the photovoltaic system shuts down around 8...9 p.m. and starts up again at 5...6 a.m. During the 10 hours in between, I consume 1-2 kWh. When the heating is on, the consumption is naturally higher, but at the same time, there isn’t as much energy coming in that could be stored.
Lumpi_LE schrieb:
It’s not about the energy being produced, but you also have to use it. In summer, the photovoltaic system shuts off around 8 to 9 p.m. (20 to 21 h) and starts again between 5 and 6 a.m. (5 to 6 h). During the roughly 10 hours in between, I consume 1 to 2 kWh. Of course, when the heating is on, consumption is higher, but there’s also less energy being generated that could be stored. I assume I’ll empty the battery every day with the electric car. So, there’s no shortage of consumption. What will be interesting is the battery management system—when and how it will act. The ideal approach would be a control system where the photovoltaic system is used as long as its output is sufficient to charge the car. After that, the battery storage would be accessed.
By the way, my photovoltaic system is currently producing 248 watts, which isn’t even enough to power the refrigerator.
dab_dab schrieb:
If the electric car were parked in the garage during the day, you’d effectively have a (mobile) storage device...Exactly! That’s why I believe that, in theory, my self-sufficiency rate without a storage system is over 30% (which is the commonly quoted household self-consumption).Zaba12 schrieb:
Exactly! That’s why I believe that, theoretically, my self-sufficiency rate without a storage system is over 30% (which corresponds to the commonly cited self-consumption rates).And with that, a stationary storage system would be even less worthwhile for you.Similar topics