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Is it worth getting a battery with solar panels?

Yes, getting a battery along with solar panels can be worth it for several reasons:

Energy Independence

With a battery, you can store the excess electricity generated by your solar panels during the day and use it at night or during periods of low sunlight. This allows you to become less reliant on the grid and have a more self-sufficient energy system.

Increased Energy Utilization

Without a battery, any surplus electricity generated by your solar panels that is not immediately consumed is typically sent back to the grid. However, with a battery, you can store and utilize this excess energy, maximizing the utilization of the solar power you generate and reducing waste.

Backup Power

In the event of a grid outage or power failure, a battery can provide backup power to your home. This is particularly beneficial if you live in an area with unreliable grid access or if you prioritize having a reliable power source during emergencies.

Time of Use Optimization

Some utility companies have time-of-use pricing, where electricity costs vary throughout the day. By storing electricity during low-cost periods and using it during high-cost periods, you can potentially save money on your energy bills.

Environmental Impact

By combining solar panels with a battery, you can further reduce your carbon footprint. The stored energy allows you to rely less on fossil fuel-generated electricity, leading to a greener and more sustainable energy solution.

How many batteries do you need to run a house on solar?

Firstly, it depends on the size of your house and the energy needs of its appliances. A larger house with more appliances will require more energy storage capacity. Secondly, the amount of solar energy your panels generate during the day will play a significant role.

Ideally, you would want to store enough energy in batteries to power your house during the night or on cloudy days when solar production is limited. To calculate the number of batteries, you'll need to consider their capacity, expressed in kilowatt-hours (kWh), and the desired level of autonomy, or how many days you'd like to rely solely on stored energy.

For example, if your house consumes an average of 30 kWh per day and you want three days of autonomy, you would require a battery bank with a capacity of at least 90 kWh. Keep in mind that battery efficiency, depth of discharge, and other factors may affect the calculations.

We can use the following formula to calculate the required number of batteries:

Number of batteries = (Daily energy consumption × Days of autonomy) / Single battery capacity


Daily energy consumption is the average amount of electricity your household consumes per day, measured in kilowatt-hours (kWh).

Days of autonomy is the number of consecutive days you want the batteries to support your household without solar energy input.

Single battery capacity is the energy storage capacity of each individual battery, measured in kilowatt-hours (kWh).

Please note that this formula provides a basic estimation, and there may be other factors to consider such as battery efficiency, maximum depth of discharge, and energy losses in the system.

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