How to Store and Sell Excess Solar Energy with Batteries

Many homeowners and businesses are turning to solar panels to generate clean, renewable energy. However, not all the energy generated by solar panels is used by the facilities themselves. This surplus energy can be stored in batteries or sold back to a local utility company. In this article, we’ll explore the possibilities and benefits of storing and selling excess solar energy with batteries.

Storing Excess Energy with Batteries

It is indeed possible to store the excess electricity generated by solar panels in batteries before selling it back to the local utility company. This practice has become increasingly popular as battery technology has advanced, making affordable and efficient energy storage a feasible option for many.

The range of storage capacities for batteries is extensive, from small portable power banks to massive grid storage systems in container farms. For home use, the most common storage systems range from 5 to 20 kilowatt-hours (kWh), such as the Tesla Power Wall. These systems allow homeowners to store energy generated during the day and use it during peak hours, reducing their overall energy costs.

Practical Considerations for Storing Energy

While it is possible to store excess solar energy in batteries and sell it back to a utility company, there are some practical considerations to keep in mind. The key is to match the timing of energy generation with demand. Here are some factors to consider:

Energy Demand Timing: During sunny days, solar panels generate the most energy. If your energy usage during these times is lower than the generation, you can store the excess energy in batteries for later use. Battery Lifespan: Batteries have a limited lifespan, typically around 10 to 15 years. Therefore, you need to factor in the replacement costs and environmental impact over time. Utility Rates: Your utility company often offers different rates for energy consumption and production. Understanding these rates can help you decide whether storing and selling the energy is financially beneficial.

For example, the best night rates might be as low as 17 cents per kWh, while the feed-in peak payback rate could be as high as 22 cents per kWh. However, the utility company may charge up to 38 cents per kWh during peak usage times.

In this scenario, it makes more economic sense to use the stored energy during peak hours rather than selling it back to the grid. This approach can significantly reduce your electricity costs and promote a more sustainable energy use.

Conclusion

Storing excess solar energy in batteries and selling it back to a local utility company is a viable and effective strategy. With advances in battery technology and more favorable utility rates, this practice is becoming increasingly accessible to homeowners and businesses. By carefully managing your energy generation and consumption, you can reduce your carbon footprint and save money in the long run.

To learn more about solar energy storage and how to optimize your energy usage, consider consulting with a professional in the field of renewable energy or exploring certified resources online.