Lithium Iron Phosphate batteries, also known as Lifepo4 batteries and LFP batteries, are a type of lithium-ion battery with lithium iron phosphate (LiFePO4) as the cathode material.
Lithium iron phosphate batteries have the advantages of high capacity, long cycle life, high temperature stability and high discharge power.
LFP batteries have 4 to 5 times the cycle life and 8 to 10 times the discharge capacity of conventional lithium batteries.
At the same weight, LFP batteries are 30-50% lighter than ordinary lithium batteries. Therefore, they are highly valued in energy storage, electric vehicles, commercial batteries and other related fields.
In solar systems, the use of LiFePO4 is becoming increasingly popular. Many solar charge controllers now support charging of LiFePO4.
In this article we will discuss the parameter setting for LiFePO4 charging in a solar controller.
What is a Solar Charge Controller
A solar charge controller is a necessary component of any solar system. It monitors and controls the charging of the battery bank. By setting proper parameters, your solar charge controller can ensure that all batteries are charged to their fullest potential.
mppt and pwm are the two most common types.
The following discussion will cover some parameters you may want to adjust on your solar charge controller in order to optimize charging of lithium iron phosphate battery banks.
How LiFePO4 Batteries Work
The LiFePO4 battery is a new type of lithium-ion battery that uses lithium iron phosphate as the cathode material.
LiFePO4 batteries have many advantages over regular lithium batteries: they are lighter, more durable and have higher discharge power.
LFP batteries function differently than traditional lithium-ion batteries and when charge with solar charge controller, the parameter setting must specified.
Solar Charge Controller Settings for Lifepo4 Batteries
Solar controller settings include battery type selection, battery voltage selection, charge voltage and disconnect voltage parameters setting.
Battery type selection: Lifepo4 batteries can be charged with solar systems using charge controllers designed for lithium ion (Li-ion) batteries.
There are different codes for different battery types and voltages, choose the correct LFP code.
Battery voltage selection: The battery voltage must match the battery voltage.
if is a 12V battery, choose the 12V mode, and 24V system, choose 24V mode.
Charge voltage: This is the maximum charger output voltage that will be allowed to charge your Lifepo4 battery pack.
if is a 12v lifepo4 battery, set the boost charge voltage to 14.4V.
24V system, multiplied by two.
Disconnect voltage: This is the voltage at which your controller will disconnect power from your solar panels.
if is a 12v lifepo4 battery, set the overvoltage Disconnect setpoint to 16.0V.
same as lead acid and gel batteries.
Frequently Asked Questions
What is the charging voltage of a 12V LiFePO4 battery?
The charging voltage of a 12V LiFePO4 battery is around 13.8-14.4 volts, depending on the charge controller you are using.
What voltage should I charge my LiFePO4 battery?
The voltage you should charge your LiFePO4 battery depends on the solar controller you are using and the voltage of battery pack.
Some solar controllers allow for charging at 14.4 volts or higher for a LifePo4 Battery
Always check with your solar controller manufacturer to make sure that they are compatible with your Lifepo4 battery pack before setting any parameters.
What is the best charger setting for LiFePO4?
The best charger setting for LiFePO4 batteries is usually around 13.8-14.4 volts with a charge current of 50-100 mA.
What should battery settings be on solar charge controller?
The battery voltage should match the battery voltage of solar PV output voltage. charge current should be set according to solar controllers’ parameters.