In the same breath, if your household electricity demand increases or is significantly greater than what your solar batteries can provide or your solar energy system can generate, your solar batteries won’t receive enough energy to charge them. Battery damage. Simple wear and tear can result in a solar battery being unable to charge.
However, if the power generated exceeds the solar battery’s capacity, it can overcharge the system. An overcharged solar system can severely damage a battery’s life. As soon as a solar battery reaches full charge, the inverter and charge controller must step in to mitigate risks by handling excess power.
What Happens to Solar Power When Batteries are Full: A Comprehensive Guide - Solar Panel Installation, Mounting, Settings, and Repair. When the batteries in a solar power system are fully charged, any excess electricity generated by the solar panels is usually sent back into the grid if the system is grid-tied.
The charge controller protects batteries and solar panels by managing the energy flow. Battery charge controllers stop electricity flow when they signal that batteries are full. Many solar power systems incorporate inverters and charge controllers to ensure trickle charging and redistribute excess charges.
Blown fuse. There may be fuses in your solar battery that will trigger if the battery gets too hot or if there is a short circuit. Once blown, the fuses will need to be replaced for the battery to recharge again. Your solar system will come with a charge controller, either separate from or built into the inverter.
When you draw power from the panel, some of that solar radiation is converted to useful energy and dissipated somewhere else. When you do not draw power from the panel, that power still must be dissipated somewhere; thermodynamics and all that. Thus it is dissipated in the panel.