Electricity surplus: The power grid is only there to sell electricity

On-grid and off-grid with identical GEMINI next generation houses. Off-grid is only more difficult to finance because the income from electricity sales is missing.

Grid connection is only to sell electricity


It has been this way for thousands of years: some farmers sell their harvest immediately, when everyone else is also selling, and get a poor price. Some can store their crop and sell it at a much better price.

This story repeats itself when selling electricity. Depending on the size and additional photovoltaic areas, a GEMINI next generation house is equipped with 100 to 200 kWh of batteries.

This is beneficial to the community because it avoids, for example, the use of inefficient peaker power plants in the evening, when the sunlight decreases and at the same time the demand for electricity increases.

Simply more photovoltaic


Certainly carport or garage with photovoltaic. But maybe a covered sitting area in the garden? Or a garden fence made of bifacial photovoltaics?

How should new photovoltaic surfaces be integrated into the system? As simple as possible, of course, which is why we are developing our own inverter in cooperation with an established manufacturer. This will be a single-phase water-cooled 5 kW inverter, which can be arbitrarily assigned to one of the 3 three-phase phases. The allocation is done dynamically via the on-board computer. Also several batteries can be installed. Which battery is charged or discharged by which inverter is also decided by the on-board computer.

Already in the 70 m² version there will be space for up to 12 of these 5 kW inverters. 6 of them are for the house roof, 2 more for garage or carport for 2 cars. 4 more can be mounted for additional photo­voltaic systems. To be compatible with the low light system, 720 cells are assigned to each inverter. This can be 10 modules with 72 cells or 12 modules with 60 cells.

side effect autarky

All the equipment to be able to sell as much electricity as possible, all the technology for minimum self-consumption, has a side effect: autarky up to 55° north latitude without any other equipment, just the standard version. Except for very unfavorable locations, such as extreme fog holes or a steep mountain just south of the house.