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Are you searching for LiFePO4 state of cost charts? You’ve come to the suitable place!

LiFePO4 batteries are presently probably the most environment friendly power storage expertise. They supply important benefits comparable to excessive power density and lengthy sturdiness.

Versus their Lead-acid counterparts, LiFePO4 batteries may be extra deeply discharged (80% to 90% most beneficial Depth of Discharge, as a substitute of the 50% for lead-acid batteries).

That is attainable as a result of the LiFePO4 battery’s voltage is nicely maintained throughout discharge. It solely begins dropping significantly at round 20% state of cost.

Actually, you possibly can estimate a LiFePO4 battery’s state of cost by measuring the battery’s resting voltage. How? By utilizing our LiFePO4 State Of Cost Charts.

On this article, we’ll focus on LiFePO4 state of cost intimately. As well as, we’ll offer you LiFePO4 State of Cost charts, so you possibly can estimate how a lot battery capability you continue to have at any second.

Foreword

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What Is A LiFePO4 State Of Cost

A LiFePO4 State of Cost (or SoC) expresses the current capability of the battery relative to its complete capability. This definition applies to different battery chemistries.

State of Cost is given in proportion. 100% SoC means the battery is absolutely charged, whereas 0% means absolutely discharged.

You’ll be able to calculate it utilizing:

State of cost (%) = Remaining Capability (Ah) / Complete Capability (Ah)

Figuring out the state of cost of your LiFePO4 battery is useful as a result of it tells you what number of Amp-hours you possibly can nonetheless draw out of your battery.

For instance, should you measured your 12V 200Ah LiFePO4 battery’s voltage and concluded — utilizing the LiFePO4 state of cost charts supplied on this article — that its current state of cost is 70%, then you possibly can nonetheless use roughly 140Ah out of your battery.

For this, you need to use:

Remaining capability (Ah) = State of Cost (%) x Complete Capability (Ah)

So within the instance above, the Remaining Capability (Ah) = 70% SoC x 200Ah = 140Ah

The inverse of State of Cost is the Depth of Discharge (or DoD). It refers back to the proportion of capability that has been discharged relative to the battery’s complete capability.

Due to this fact, in case your battery’s DoD is 40%, its state of cost is 60%.


How is LiFePO4 State Of Cost Decided?

To know how the state of cost is decided, let’s first assessment a couple of ideas:

Completely different Phrases For Voltage

  • Nominal voltage is the voltage supplied by a totally charged battery beneath specified circumstances of temperature and cargo. It will depend on the battery’s chemistry.
  • Rated Voltage is the voltage by which the battery operates reliably. Producers often around the nominal voltage of batteries to offer their rated voltages.
  • The precise measured voltage of a battery decreases because it discharges.
  • Open circuit voltage is the voltage measured between the battery terminals with no load utilized. It’s proportional to the battery’s state of cost.

LiFePO4 Battery Voltage

  • A LiFePO4 battery is an meeting of a number of LiFePO4 cells. The variety of cells in a battery will decide its nominal voltage.
  • The nominal voltage of a LiFePO4 cell is 3.2V
  • A 12V LiFePO4 battery is achieved by connecting 4 LiFePO4 cells in sequence.
  • Lastly, a 48V LiFePO4 battery is achieved by connecting sixteen LiFePO4 cells in sequence or 4 12V LiFePO4 batteries in sequence.
Rated Voltage Nominal Voltage
3V 3.2V
12V 12.8V
24V 25.6V
48V 51.2V
Values for LiFePO4 cell/batteries

Now that we’ve obtained this out of the best way, let’s take a look at how one can estimate the state of cost by measuring the open-circuit voltage:


Figuring out SoC Utilizing The Voltage Technique

This methodology allows you to estimate the remaining capability of your LiFePO4 battery by measuring the battery’s voltage.

For this, it is advisable use a voltmeter (or multimeter) to measure the battery’s open-circuit voltage (when there’s no present) and use the suitable LiFePO4 state of cost chart to test the capability that corresponds to the voltage studying.

For instance, should you measured a 13.2V voltage to your 12V LiFePO4 battery, you possibly can test the 12V LiFePO4 state of cost chart to determine that your battery’s state of cost is 70%.

Though this methodology is fairly easy and simple to carry out, it’s essential to level out that the battery’s present/discharge fee and temperature considerably have an effect on the voltage.

As well as, the design aim of a battery is to offer a voltage as fixed as attainable — regardless of the change within the state of cost — which makes this methodology tough to use.


Figuring out SoC Utilizing The Present Integration Technique

Battery Administration Techniques use this methodology to find out the battery’s state of cost. That is essential as a result of the function of the BMS is to manage your battery’s charging course of by regulating its voltage enter and output, stopping any damages to your battery.

Due to this fact, the BMS should constantly monitor voltage, amperage, and state of cost.

To calculate the SoC, the BMS measures the battery’s present and integrates it with respect to time.

The battery’s inner monitoring system does this integration. To measure the SoC your self (utilizing a voltmeter and LiFePO4 state of cost charts), persist with the Voltage Technique.


12V LiFePO4 Battery Voltage Chart

Right here we current the LiFePO4 state of cost chart for 12V LiFePO4 batteries:

State of Cost Voltage
100% (charging voltage) 14.4V
100% (open circuit) 13.5V
99% 13.4V
90% 13.3V
70% 13.2V
40% 13.1V
30% 13.0V
20% 12.9V
10% 12.8V
1% 10.8V
0% 9.5V
State of Cost (SoC) x Measured Voltage
desk for a 12V LiFePO4 battery

And its corresponding curve:

12V lifepo4 state of charge chart
State of Cost vs. Measured Voltage (at 25ºC or 77ºF) curve of a typical 12V LiFePO4 battery
Supply: Climatebiz

As beforehand talked about, you possibly can roughly estimate the state of cost (the battery’s remaining capability) by its relaxation voltage (when not charging or discharging, zero present).

12V LiFePO4 batteries are a preferred choice for photo voltaic battery methods, particularly for small-scale initiatives.

Necessary notice: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values introduced within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s person guide can present extra correct data to your particular LiFePO4 battery.

Necessary notice: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values introduced within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s person guide can present extra correct data to your particular LiFePO4 battery.


24V LiFePO4 Battery Voltage Chart

Right here we current the LiFePO4 state of cost chart for 24V LiFePO4 battery methods:

State of Cost Voltage
100% (charging voltage) 28.8V
100% (resting voltage) 27.0V
99% 26.8V
90% 26.6V
70% 26.4V
40% 26.2V
30% 26.0V
20% 25.8V
10% 24.6V
1% 21.6V
0% 19V
State of Cost (SoC) x Measured Voltage
desk for a 24V LiFePO4 battery

And its corresponding curve:

24V lifepo4 state of charge chart
State of Cost vs. Measured Voltage (at 25ºC or 77ºF) curve of a typical 24V LiFePO4 battery
Supply: Climatebiz

A 24V LiFePO4 may be obtained by connecting two 12V LiFePO4 is sequence.

Necessary notice: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values introduced within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s person guide can present extra correct data to your particular LiFePO4 battery.


48V LiFePO4 Battery Voltage Chart

Right here we current the final one in all our LiFePO4 state of cost charts for 48V LiFePO4 battery methods

State of Cost Voltage
100% (charging voltage) 57.6V
100% (resting voltage) 54.0V
99% 53.6V
90% 53.2V
70% 52.8V
40% 52.4V
30% 52.0V
20% 51.6V
10% 49.2V
1% 43.2V
0% 38V
State of Cost (SoC) x Measured Voltage
desk for a 48V LiFePO4 battery

And its corresponding curve:

48V lifepo4 state of charge chart
State of Cost vs. Measured Voltage (at 25ºC or 77ºF) curve of a typical 48V LiFePO4 battery
Supply: Climatebiz

48V LiFePO4 batteries aren’t widespread, particularly for small-scale photo voltaic battery methods.

Additionally, be very cautious and use insulating gloves when dealing with 48V battery methods. As a tough rule of thumb, 50V is ample to drive a probably deadly present by way of the human physique.

Necessary notice: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values introduced within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s person guide can present extra correct data to your particular LiFePO4 battery.


What Is The Absorption Time For A LiFePO4 Battery?

In comparison with Lead-Acid Batteries, LiFePO4 batteries have a extra easy charging course of.

Battery Chemistry Charging Phases Common Charging Time
Lead-Acid batteries Bulk, Absorption, and Float 10 hours
LiFePO4 batteries Fixed Present (CC) and Fixed Voltage (CV) 4 hours

“Absorption” is an idea borrowed from the charging profile of Lead-Acid batteries. It refers back to the charging part by which the battery maintains a relentless voltage whereas the present regularly decreases.

As soon as the present reaches a sure low level (will depend on the C-rate), the charging course of is accomplished, and the battery is absolutely charged.

Verify your LiFePO4 battery’s Person Handbook to search out the beneficial charging present and charging voltage to optimize the charging course of and decrease stress in your battery.

Whereas the absorption time could fluctuate from one model to a different, the typical beneficial absorption time for LiFePO4 batteries at a charging voltage between 14.2V and 14.6V is round quarter-hour.

For instance, Battery Born Batteries recommends an absorption time of roughly 20 minutes per battery. In the meantime, Canbat recommends 6 minutes of absorption time.

Nonetheless, the absorption time of LiFePO4 batteries shouldn’t exceed half-hour to forestall overcharging.


Is LiFePO4 A Strong State Battery?

Not precisely.

The presently accessible and broadly used LiFePO4 batteries should not solid-state batteries since their electrolyte isn’t stable; it’s liquid.

Nonetheless, there are solid-state batteries currently being developed that use LiFePO4 battery supplies (just like the cathode), though many challenges are but to be overcome, as LiFePO4 supplies are recognized for having the problem of poor solid-state diffusivity.

Right here’s a bit of knowledge on solid-state batteries and LiFePO4 batteries which may assist you perceive the distinction between them:


Strong State Battery

A solid-state battery is a brand new battery expertise that makes use of a stable electrolyte, as a substitute of the liquid or gel electrolyte present in conventional lithium batteries, comparable to Lithium Iron Phosphate (LiFePO4).

This battery expertise remains to be within the phases of improvement. Nonetheless, it’d change into commercially accessible quickly, because it affords many benefits over the present applied sciences, comparable to security and better sturdiness.


Lithium Iron Phosphate Cells

LiFePO4 cells are made from the next elements:

  • Cathode: LiFePO4
  • Anode: Graphite 
  • Electrolyte: Lithium Salts in an natural solvent
  • Separator: Polyethylene microporous membrane

Due to this fact, in contrast to Strong-State batteries, LiFePO4 batteries don’t include a stable electrolyte; the electrolyte is liquid.

To summarize, the presently accessible LiFePO4 batteries should not solid-state batteries, however there may very well be a Lithium Iron Phosphate solid-state battery sooner or later if researchers work out a solution to make them effectively.


By How A lot Can LiFePO4 Batteries Be Discharged?

Not like Lead-acid batteries (which beneficial DoD is 50%), LiFePO4 batteries may be frequently discharged to 100% DoD with out struggling any main efficiency points. Nonetheless, doing so can drastically cut back your LiFePO4 battery’s life cycle.

Due to this fact, if you wish to get probably the most out of your LiFePO4 battery, it is best to test the person guide for the beneficial most Depth of Discharge (DoD).

Normally, producers advocate a DoD of 80% for LiFePO4 batteries. After that, it is best to recharge your battery.

This apply maximizes your LiFePO4 battery’s life cycle and general efficiency.


Closing Ideas

Regardless of the excessive upfront value, a LiFePO4 battery affords many benefits for photo voltaic power storage methods, comparable to greater DoD, lengthy sturdiness, greater power density, and light-weight.

However to get pleasure from all of the perks your LiFePO4 affords, it’s very important that you just perceive how your battery works and the connection between some primary battery specs, like life cycle, nominal voltage, depth of discharge, and state of cost.

When you’re conversant in these ideas, you need to use the LiFePO4 State Of Cost Charts introduced on this article to find out your battery’s state of cost. This will come in useful when it is advisable estimate how a lot capability your battery can nonetheless present.

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