What Happens When a Solar Battery is Full?

Where does solar go when batteries are full?

If you’ve recently added battery storage to your solar system or plan on doing so, it’s only natural you’d have questions about how these batteries work. Solar panel installers from Murrieta to San Diego hear this question frequently: Where does excess solar energy go if the battery is full?

Solar batteries have a limited amount of energy they can retain in a single charge. But what happens when the battery is fully charged? Depending on your specific setup, the excess energy can move to several different places. Read on.

Where does solar go when batteries are full?

What happens to your excess solar energy will depend on the type of solar system you have.

Hybrid Inverters & the Grid

If you use a hybrid inverter system or have a solar system without battery backup, the produced energy will be either stored in the inverter or sent back into the grid for credit. Having your solar system connected to the grid is useful if you don’t want to worry about running out of power or wasting power when your batteries are fully charged. However, these types of systems can’t work during power outages, which can be a problem for many homeowners, especially those who live in areas with frequent natural disasters.

Off-Grid Systems

If your solar system is not connected to the grid, you are completely reliant on your setup to power the appliances in your home. This is a great way to store excess energy and use it during peak demand hours when energy rates are at their highest, as well as during power outages. However, this also means that you won’t be able to use the grid as backup any longer.

An off-grid solar system doesn’t have a back-up solution. When its batteries are full, the energy has nowhere else to go. Luckily, modern solar batteries designed for off-grid systems have much higher capacities than those designed for grid-tied systems. And since they can take in so much energy, they also tend to take quite a bit longer to charge. If your battery bank is properly sized for your energy needs, you’ll be quite unlikely to run out of storage at any point.

How do I know when my solar batteries are fully charged?

The method used for checking the charge of your solar battery will depend on the type of battery you have:

  • Lithium-ion batteries typically come with specialized charging systems and charge controllers. These devices are used both to charge the battery properly and measure its current charge level.
  • The charge of lead-acid batteries can also be checked using a charge controller, although many hydrometers and voltmeters can also be used. Additionally, you can also tell the charge of your battery by looking at the inverter, since many of them have led lights that indicate if the battery is charging or not.

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How do I know when my solar batteries are fully charged?

Whether you need help properly sizing the inverter for your solar system, want to know if a 2000 watt inverter can run your fridge, or need any other solar-related question answered, Action Solar is at your beck and call. We work with a team of qualified and experienced technicians who know all the ins and outs of solar systems, which enables us to provide Riverside County residents with dependable and efficient solar services.

If you are interested in gaining independence from the grid and avoiding ToU rate increases, make sure to check out our website and learn more about the state-of-the-art lithium batteries we offer. With Action Solar and cutting edge technology on your side, you’ll get to enjoy clean energy and incredible savings in no time. Give us a call today!