Yes, 

A house can run on solar power alone, but it depends on several factors, including the size of the solar system, the amount of electricity the house uses, and the climate of the area where the house is located.

If the solar system is designed to provide enough power to cover all of the electricity needs of the house, and if the house is energy-efficient and uses electricity wisely, it can run on solar power alone. However, in cases where the solar system is not able to produce enough power, for example, on cloudy or shady days, the house may need to draw power from the grid.

Additionally, some household appliances and systems, such as electric vehicles or air conditioning units, require a large amount of electricity and may not be able to run solely on a solar system, especially if it is not sized accordingly. In these cases, it may be necessary to supplement the solar system with power from the grid.

Overall, a house can run on solar power alone, but careful consideration and planning are necessary to ensure that the system is able to meet the electricity needs of the house.