I have a project in which I design a house that runs completely on renewable energy sources. When I put in solar energy, the batteries are said to use the sun's light and store the energy for later use. My question is if those batteries have some kind of fossil fuels in them or would use fossil fuels?

Oh, yes. I wasn't careful enough. Thank you :).

:-)

You're welcome.

The batteries used in solar energy systems, such as those used in a house that runs on renewable energy, are typically not made to use or contain fossil fuels. These batteries are designed to store energy produced by solar panels, which convert sunlight into electricity. They work by utilizing a chemical process to store and release energy.

There are various types of batteries commonly used in solar energy systems, including lead-acid batteries, lithium-ion batteries, and other advanced battery technologies. None of these battery types require or use fossil fuels as part of their operation.

Lead-acid batteries are the older and more traditional type of battery commonly used in renewable energy systems. They consist of lead plates and an acid electrolyte solution. These batteries do not involve the use of fossil fuels, but they do require periodic maintenance, such as adding distilled water to the electrolyte.

Lithium-ion batteries are a more modern and popular choice for solar energy systems. They utilize lithium-ion chemistry to store and release energy. These batteries are rechargeable and do not require any fossil fuels for their operation.

It's important to note that while the batteries themselves may not use fossil fuels, the electricity used to charge these batteries may come from a variety of sources, including fossil fuel-based power plants. However, for a truly renewable energy system, it is recommended to use a combination of solar panels, battery storage, and other renewable energy sources (such as wind or hydro power) to minimize or eliminate the use of fossil fuels in the overall energy generation and storage process.

http://www.jiskha.com/display.cgi?id=1389218496

But I thought that batteries and power inverters would be different.

Please read Damon's answer carefully. He discussed the source of power for batteries.