Do solar panels need to use photovoltaic DC cables to connect to batteries?

No need. To generate electricity from solar panels, you do not need to use a photovoltaic DC cable to connect to the battery. You can also connect the solar panel directly to the battery. The electrical energy generated by the solar panel can be instantly stored in the battery for use by electrical equipment. The battery has the ability to store electrical energy and provide stability. Solar cells, also known as “solar chips” or “photocells”. a type of device that uses sunlight to directly produce flakes of optoelectronic semiconductors that generate electricity. Simple solar cells cannot be used directly as energy sources. To realize power supply, multiple solar cells need to be connected in series, parallel and tightly sealed in the composing.