At night, the equipment runs on batteries. And here is the worst. Battery power is significantly more expensive than a power outlet. Batteries are expensive and need to be replaced periodically. Is it only an option to consider. During the day - solar panels, at night - from the outlet. In this case, a two-tariff meter must be installed. Electricity is cheaper at night. and still, make an electric stove. The tariff with electric stoves is even cheaper. It depends on the region.