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Overview
Solar batteries allow you to store the energy generated by your solar panels for later use. Combining solar panels and solar batteries to form a ‘hybrid solar system’ provides a variety of benefits, including access to reliable backup power and independence from your utility.
But, exactly, how do solar batteries work? And, maybe most crucially, how much do they cost? Continue reading to find out.
How Solar Batteries Work
Solar batteries store the excess solar energy produced by your panels that you do not immediately use, allowing you to draw on it later.
See, solar panels create the most electricity during the middle of the day, which is also when your home needs the least amount of electricity. Excess solar energy is transmitted back to the utility grid with a standard grid-tied solar system.
When solar panels are combined with a home battery, the extra electricity is stored in the battery rather than sent to the grid. When the sun sets and your panels stop producing electricity, you can use the energy stored in your battery instead of paying for electricity from the utility.
Types Of Solar Batteries
There are four basic types of battery technology that can be used in conjunction with home solar systems:
- Lead acid batteries
- Lithium ion batteries
- Nickel based batteries
- Flow batteries
Each of these battery backup power solutions has its own set of distinguishing features. Let us look more closely at what each form of solar battery has to offer.
Lead Acid Batteries
Lead acid batteries are the tried-and-true technology in the area of solar batteries.
Deep-cycle batteries have been used to store energy for a long time, dating back to the 1800s. And they’ve been able to stay because of their dependability.
Lead acid batteries are classified into two types: flooded lead acid batteries and sealed lead acid batteries.
Lithium Ion Batteries
Lithium ion batteries are the newest additions to the energy storage family.
As the popularity of electric vehicles grew, EV manufacturers recognized the promise of lithium ion as an energy storage solution. They immediately rose to prominence as one of the most extensively used solar battery banks.
Nickel cadmium batteries
Nickel cadmium (Ni-Cd) batteries are less common than lead acid or lithium ion batteries.
Ni-Cd batteries first appeared in the late 1800s, but they were given a makeover in the 1980s that dramatically boosted the amount of energy they could store. They are popular in the aircraft industry.
Flow Batteries
Flow batteries are a new technology in the energy storage industry.
They contain a water-based electrolyte liquid that flows between the battery’s two distinct chambers, or tanks. When charged, chemical reactions take place, allowing the energy to be stored and then expelled. These batteries are becoming increasingly popular.
Batteries For Solar Panels Prices
Depending on the battery’s chemistry, a solar battery can cost anywhere from $200 to $15,000 to install.
Most residential grid-tied solar panels are paired with lithium-ion batteries, which cost anywhere from $7,000 to $14,000 to install. There are some small-capacity lead-acid batteries that can cost as little as $200, but they won’t be able to power much in your home and are typically used as emergency backup power for RVs.
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