Unused energy from this solar power array will be automatically exported to the power grid, giving the owner a credit for future electricity use on non-sunny days. When the modules continue to pump electricity to the batteries beyond their capacity, an overload occurs. It can severely damage your battery banks and make them unusable afterwards. Whenever your solar energy system generates unused solar energy, your system will transmit it back to the power grid.
Other people will end up using the energy you generate and will pay you in return. What happens to solar energy when batteries are full? When solar-powered batteries are full, any excess energy is wasted if not redirected to another location. Usually, a switch is installed to direct excess energy to auxiliary sources or simply to ensure that excess charge does not damage the battery. There are no harmful side effects from excess potential solar energy.
The panels do not overheat, the wires do not melt, etc. You simply lose energy that cannot be recovered. If this happens frequently, adding additional battery capacity will harness this energy as long as the charge controller is able to handle the additional charging current. But if ultimately this additional accumulated energy is not consumed, there is no justification for this additional capacity and expenses.
As shown above, a solar cell does not produce all of its energy all the time, but it still receives energy from the sun. Powering the grid with clean solar energy reduces the local electricity load, which is a huge benefit for all residents of the area, as this will save money for everyone. With fewer people in the house, total energy consumption decreases even though the solar system generates the same amount. If your charging (charging the battery plus the home) requires less energy than your solar panels can produce, the excess potential energy is simply wasted.
Although the costs of residential batteries are still relatively high compared to the entire solar system, some customers will install them so that they can be used to store energy during power outages, such as a storm or other catastrophic event. No, your additional solar electricity can be used elsewhere, assuming your system is connected to the power grid. Every bit of electricity sent to the grid from its solar panels is electricity that the power company doesn't have to generate by burning fossil fuels. An added benefit is that your unused solar energy will be converted into credits on your utility company's bill that you can use during the winter months or whenever you want.
If you live in one of the states with net metering, you'll be credited every time your solar panel system sends electricity to the grid. The efficiency of your solar panel will determine the amount of sunlight that can be converted into electricity. In some cases, people connect the output cables of the solar modules directly to the battery terminals. The fact is that solar panels alone have no way of understanding if the batteries are full or not.