ᐅ Using Photovoltaic Systems for Household Electricity without Grid Feed-In Control
Created on: 28 Sep 2022 22:39
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Carlanickel
Hello,
what technical requirements are we missing to use the electricity generated by our photovoltaic system in the house without a battery storage and without the grid frequency signal (kHz) from the utility company? We would like to be self-sufficient.
To explain: We use our self-generated electricity when it is bright, but we always rely on an active connection to the existing house grid from the utility for the frequency reference. (I hope I understood our photovoltaic technician correctly, but unfortunately, he is no longer available.)
Thanks for your feedback
Carlanickel
what technical requirements are we missing to use the electricity generated by our photovoltaic system in the house without a battery storage and without the grid frequency signal (kHz) from the utility company? We would like to be self-sufficient.
To explain: We use our self-generated electricity when it is bright, but we always rely on an active connection to the existing house grid from the utility for the frequency reference. (I hope I understood our photovoltaic technician correctly, but unfortunately, he is no longer available.)
Thanks for your feedback
Carlanickel
C
Carlanickel29 Sep 2022 10:07Hello, thank you very much – also for your clear words. Then we should consider an electricity storage system; based on what you said, that seems to be the only reasonable option. The hydrogen solution still feels too new to me.
I have serious concerns about a longer power outage and was hoping there might be a simpler and more affordable way to use our electricity independently in such cases.
PS: Except for lighting, everything runs during the day, and we hardly ever watch TV. The gas heating is completely switched off except for the unfortunately necessary flame for controlling the solar thermal system (see my other question), since we have an 8 kW wood stove, and our tenant received a 6 kW wood stove years ago. We cut our own wood and currently have 10 cubic meters (12.5 cubic yards) of dry firewood stored in the garden, and next month we’ll collect quite a bit of wet wood from the forest. Since last year, we’ve only heated water for 3 hours a day; in summer the roof produces enough. Our tenant follows the same approach, as there isn’t much budget available there. As a result, ancillary costs have dropped significantly.
I have serious concerns about a longer power outage and was hoping there might be a simpler and more affordable way to use our electricity independently in such cases.
PS: Except for lighting, everything runs during the day, and we hardly ever watch TV. The gas heating is completely switched off except for the unfortunately necessary flame for controlling the solar thermal system (see my other question), since we have an 8 kW wood stove, and our tenant received a 6 kW wood stove years ago. We cut our own wood and currently have 10 cubic meters (12.5 cubic yards) of dry firewood stored in the garden, and next month we’ll collect quite a bit of wet wood from the forest. Since last year, we’ve only heated water for 3 hours a day; in summer the roof produces enough. Our tenant follows the same approach, as there isn’t much budget available there. As a result, ancillary costs have dropped significantly.
Most inverters shut down the generator when the grid is down. This is intentional, for safety reasons. Otherwise, the grid operator can never be sure that the lines are de-energized.
There are inverters with island mode or emergency power function. However, this does not supply your entire household but is implemented through separate outlets on the inverter.
Storage combined with a compatible inverter would be a solution.
There are inverters with island mode or emergency power function. However, this does not supply your entire household but is implemented through separate outlets on the inverter.
Storage combined with a compatible inverter would be a solution.
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karl.jonas29 Sep 2022 22:11It might be a good idea to consider an uninterruptible power supply (UPS) for a few critical devices. This is common for PCs and should also be sufficient for an aquarium for a while.
If you really want to supply your apartment building with power for 30 hours, you might want to look into a diesel generator. That will also work at night.
What actually happens with a photovoltaic system when an emergency generator is feeding power? Does it then supply power again? And what about the technicians who are repairing the broken cable at that time?
If you really want to supply your apartment building with power for 30 hours, you might want to look into a diesel generator. That will also work at night.
What actually happens with a photovoltaic system when an emergency generator is feeding power? Does it then supply power again? And what about the technicians who are repairing the broken cable at that time?
K
karl.jonas29 Sep 2022 22:23I just looked up and solved the issue concerning the technicians: the emergency power generator is disconnected from the grid via a transfer switch. The only question is where the electricity possibly generated by the photovoltaic system goes then...
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Carlanickel29 Sep 2022 23:09Hello, yes, my husband and I have now also realized that buying a generator is most likely the most cost-effective option. However, the question remains how we can integrate this power into the home's electrical system. But many people have already found solutions for this, for example with garden sheds, so we can figure it out too. By the way, the photovoltaic system can be switched off at the inverter, but what happens to the electricity still generated then? No idea…
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