Lithium-Ion Solar Battery: Definition and How it Works
The voltage of your solar panel is a significant factor in how much energy you get, as this determines what type of regulator you need to use with your lithium battery.
While solar panels are able to charge lithium batteries, solar charge controllers are required. An MPPT (Maximum Power Point Tracking) solar charge controller is an example of a solar charge controller that allows more current into the battery, leading to faster battery charging.
Lithium-ion batteries are popular for solar storage due to their high energy density, long lifespan, and decreasing cost. There are several types of lithium-ion batteries, but two types are the most commonly used for solar storage: lithium iron phosphate (LFP) and nickel manganese cobalt (NMC).
Lithium ion solar batteries are ideal for residential solar systems, providing homeowners with a reliable way to store excess energy generated by solar panels during the day. This stored energy can be used at night or during power outages, ensuring a continuous power supply and reducing reliance on the grid.
The SoC voltage chart for lithium batteries shows the voltage values with respect to SoC percentage. A Li-ion cell when fully charged at 100%SoC can have nearly 4.2V. As it starts to discharge itself, the voltage decreases, and the voltage remains to be 3.7V when the battery is at half charge, ie, 50%SoC.
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