Domestic energy generation installation and operating method for operating a domestic energy generation installation

A method for operating a domestic energy generation installation for self-sufficient electricity supply and for CO2-neutral, self-sufficient heat supply for single- and two-family homes, comprising the steps of:

• determining or prespecifying at least one expectation time period, wherein the at least one expectation time period extends as a short-term expectation time period until energy of a regenerative energy source is once again available after the next possible sunrise,
• determining an expected load profile of an electricity consumer including the electric power consumption of said electricity consumer during the at least one expectation time period,
• determining an expected yield profile of the regenerative energy source in the at least one expectation time period, including an electrical PV power of a PV generator,
• determining or prespecifying a minimum consumption power which should at least be available for withdrawal from a storage battery unit at any one time, and/or prespecifying an end-of-discharge voltage of the storage battery unit which should not be undershot at any time,
• determining a target state of charge of the storage battery unit and an energy balance over the at least one expectation period from the expected yield profile and the expected load profile,
• determining a time range of the storage battery unit from the expected load profile, the expected yield profile and the minimum consumption power, which should not be undershot at any time, and from a currently determined state of charge of the storage battery unit and from the end-of-discharge voltage,
• operating a fuel cell unit with a fuel cell power depending on the determined time range of the storage battery unit, including switching on the fuel cell unit if the determined time range of the storage battery unit is shorter than the at least one expectation time period and/or switching off the fuel cell unit if the determined time range of the storage battery unit is longer than the at least one expectation time period,
• operating an electrolysis unit with a calculated electrolysis power, depending on the determined energy balance, including switching on the electrolysis unit if the determined energy balance is positive and/or switching off the electrolysis unit if the determined energy balance is negative.