Investing in Solar Batteries: Is It Worth Going Beyond Solar Panels?

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As Idahoans from Boise to Mountain Home embrace sustainable energy, solar batteries have emerged as a pivotal component in maximizing energy independence. At Idahome Energy, we often field questions about the costs and benefits of adding a solar battery to your system. Let’s explore whether investing in solar batteries is worthwhile and how it can enhance your solar experience in Treasure Valley.

Understanding the Costs of Solar Batteries

Adding a solar battery to a solar panel system typically increases the initial investment by over $10,000. This substantial cost prompts many homeowners in Meridian, Kuna, and beyond to wonder if the benefits justify the expense.

Are Solar Batteries Worth It?

In general, the value of installing a solar battery hinges on achieving greater savings over the life of the battery than the cost of owning and maintaining it. Here are several scenarios where a solar battery proves its worth:

  • Time-of-Use Savings: For residents of Boise on time-of-use tariffs, where electricity prices vary throughout the day, a solar battery allows you to store cheap solar energy generated during the day and use it during expensive peak hours.
  • Demand Charge Reduction: In areas like Eagle, where electricity bills include demand charges based on the highest rate of electricity used during billing periods, solar batteries can help manage consumption and lower costs.
  • kWh Arbitrage: Homeowners can take advantage of kWh arbitrage by storing surplus solar energy or battery power and exporting it to the grid when rates are highest. It’s important to note that this a credit on your utility account rather than a direct payment, which can still significantly offset monthly electricity costs depending on the time of year and utility rates. This strategy can enhance the financial returns of your solar investment by reducing net energy costs over time.

What Are Solar Batteries?

Solar batteries store the electricity generated by your solar panels for later use. When assessing batteries, consider two main features:

  • Rated Power Output: This is the maximum load that the battery can handle at one time, measured in kilowatts (kW).
  • Energy Storage Capacity: This indicates how much electricity (in kilowatt-hours, kWh) the battery can store.

For instance, a battery with a 5 kW power rating and a 10 kWh storage capacity can sustain a 5 kW load for two hours, or a smaller 1.25 kW load for eight hours.

Types of Solar Batteries and Their Lifespans

Solar batteries vary primarily in their chemistry, which influences their lifespan and efficiency. Common types include lithium-ion and lead-acid batteries. The lifespan typically ranges from 10 to 15 years, depending on usage and maintenance.

Calculating Your Solar Battery Needs

  • To Power a House: The number of batteries needed depends on your home’s energy use and the capacity of the batteries. For average energy needs in Meridian or Kuna, 1-2 batteries may be all that is needed.
  • To Go Off-Grid: Going off-grid usually requires a more extensive setup to ensure power availability at all times. This might mean multiple batteries depending on your total energy consumption.

More Solar Panels or More Batteries?

The decision between adding more solar panels or batteries depends on your energy goals. If your aim is to maximize energy production, additional panels are the way to go. If you seek to enhance energy independence and manage energy costs better, investing in batteries can be advantageous.

Idahome Energy’s Top Battery Pick: Tesla Powerwall 3

At Idahome Energy, we specifically recommend the Tesla Powerwall 3 for several compelling reasons:

  • Efficiency and Reliability: The Tesla Powerwall 3 is known for its high efficiency, meaning it converts a higher percentage of solar energy into usable electricity. This is crucial in maximizing the returns on your solar investment.
  • Seamless Integration and Large Inverter Capacity: It features a built-in inverter system capable of handling full electrical panel access, supporting continuous loads up to 60 amps. This capability allows it to power entire homes comfortably, ensuring that even high-demand appliances can operate without interruption.
  • Balanced Output and Storage: Offering a balance of 13.5 kWh energy storage capacity and a continuous power output of 11.5 kW, it meets the needs of most households in Boise, Eagle, and surrounding areas. Tesla will also be releasing expansion packs for extra storage capacity needs.
  • Smart Energy Management: With its smart capabilities, the Tesla Powerwall 3 allows homeowners to monitor and adjust their energy usage in real-time, optimizing for energy savings and efficiency.


For Treasure Valley residents considering solar batteries, the investment can be substantial but worthwhile under the right circumstances. Whether you’re looking to cut down on energy costs in Eagle, increase independence in Kuna, or manage peak rates in Boise, a solar battery can be a valuable addition to your solar system. If you’re ready to explore how solar batteries can fit into your energy strategy, contact Idahome Energy. Our experts are here to help you navigate your choices and ensure that your solar system meets and exceeds your expectations.

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