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Are you searching for LiFePO4 state of cost charts? You’ve come to the suitable place!
LiFePO4 batteries are at the moment probably the most environment friendly vitality storage know-how. They supply vital benefits equivalent to excessive vitality density and lengthy sturdiness.
Versus their Lead-acid counterparts, LiFePO4 batteries could be extra deeply discharged (80% to 90% most really useful Depth of Discharge, as an alternative of the 50% for lead-acid batteries).
That is potential as a result of the LiFePO4 battery’s voltage is effectively maintained throughout discharge. It solely begins dropping significantly at round 20% state of cost.
In truth, you’ll be able to estimate a LiFePO4 battery’s state of cost by measuring the battery’s resting voltage. How? Through the use of our LiFePO4 State Of Cost Charts.
On this article, we’ll talk about LiFePO4 state of cost intimately. As well as, we’ll give you LiFePO4 State of Cost charts, so you’ll be able to estimate how a lot battery capability you continue to have at any second.
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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 share. 100% SoC means the battery is totally charged, whereas 0% means totally discharged.
You may calculate it utilizing:
State of cost (%) = Remaining Capability (Ah) / Whole Capability (Ah)
Understanding the state of cost of your LiFePO4 battery is useful as a result of it tells you what number of Amp-hours you’ll be able to nonetheless draw out of your battery.
For instance, in case 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 realize you’ll be able to nonetheless use roughly 140Ah out of your battery.
For this, you need to use:
Remaining capability (Ah) = State of Cost (%) x Whole 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 share of capability that has been discharged relative to the battery’s complete capability.
Subsequently, 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 set, let’s first evaluation just a few ideas:
Totally different Phrases For Voltage
- Nominal voltage is the voltage supplied by a totally charged battery underneath specified situations of temperature and cargo. It depends upon the battery’s chemistry.
- Rated Voltage is the voltage during which the battery operates reliably. Producers normally 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 collection.
- Lastly, a 48V LiFePO4 battery is achieved by connecting sixteen LiFePO4 cells in collection or 4 12V LiFePO4 batteries in collection.
| Rated Voltage | Nominal Voltage |
|---|---|
| 3V | 3.2V |
| 12V | 12.8V |
| 24V | 25.6V |
| 48V | 51.2V |
Now that we’ve bought 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 technique allows you to estimate the remaining capability of your LiFePO4 battery by measuring the battery’s voltage.
For this, you could 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, in case you measured a 13.2V voltage in your 12V LiFePO4 battery, you’ll be able to test the 12V LiFePO4 state of cost chart to ascertain that your battery’s state of cost is 70%.
Though this technique is fairly easy and simple to carry out, it’s essential to level out that the battery’s present/discharge charge 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 potential — regardless of the change within the state of cost — which makes this technique tough to use.
Figuring out SoC Utilizing The Present Integration Technique
Battery Administration Methods use this technique to find out the battery’s state of cost. That is essential as a result of the position of the BMS is to regulate your battery’s charging course of by regulating its voltage enter and output, stopping any damages to your battery.
Subsequently, 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 inside monitoring system does this integration. To measure the SoC your self (utilizing a voltmeter and LiFePO4 state of cost charts), follow 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 |
desk for a 12V LiFePO4 battery
And its corresponding curve:
Supply: Climatebiz
As beforehand talked about, you’ll be able to 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 possibility for photo voltaic battery programs, particularly for small-scale initiatives.
Vital observe: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values offered within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s consumer guide can present extra correct data in your particular LiFePO4 battery.
Vital observe: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values offered within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s consumer guide can present extra correct data in your particular LiFePO4 battery.
24V LiFePO4 Battery Voltage Chart
Right here we current the LiFePO4 state of cost chart for 24V LiFePO4 battery programs:
| 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 |
desk for a 24V LiFePO4 battery
And its corresponding curve:
Supply: Climatebiz
A 24V LiFePO4 could be obtained by connecting two 12V LiFePO4 is collection.
Vital observe: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values offered within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s consumer guide can present extra correct data in your particular LiFePO4 battery.
48V LiFePO4 Battery Voltage Chart
Right here we current the final certainly one of our LiFePO4 state of cost charts for 48V LiFePO4 battery programs
| 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 |
desk for a 48V LiFePO4 battery
And its corresponding curve:
Supply: Climatebiz
48V LiFePO4 batteries aren’t widespread, particularly for small-scale photo voltaic battery programs.
Additionally, be very cautious and use insulating gloves when dealing with 48V battery programs. As a tough rule of thumb, 50V is ample to drive a probably deadly present via the human physique.
Vital observe: Voltage values can barely differ for every LiFePO4 battery, so be suggested that the values offered within the following tables are for reference solely. Furthermore, checking your LiFePO4 battery’s consumer guide can present extra correct data in 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 section during which the battery maintains a continuing voltage whereas the present step by step decreases.
As soon as the present reaches a sure low level (depends upon the C-rate), the charging course of is accomplished, and the battery is totally charged.
Examine your LiFePO4 battery’s Consumer Handbook to search out the really useful charging present and charging voltage to optimize the charging course of and reduce stress in your battery.
Whereas the absorption time might range from one model to a different, the typical really useful 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 mustn’t exceed half-hour to forestall overcharging.
Is LiFePO4 A Strong State Battery?
Not precisely.
The at the moment out there and broadly used LiFePO4 batteries usually are not solid-state batteries since their electrolyte isn’t strong; 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 that may allow you to perceive the distinction between them:
Strong State Battery
A solid-state battery is a brand new battery know-how that makes use of a strong electrolyte, as an alternative of the liquid or gel electrolyte present in conventional lithium batteries, equivalent to Lithium Iron Phosphate (LiFePO4).
This battery know-how continues to be within the levels of growth. Nonetheless, it’d change into commercially out there quickly, because it gives many benefits over the present applied sciences, equivalent 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
Subsequently, in contrast to Strong-State batteries, LiFePO4 batteries don’t include a strong electrolyte; the electrolyte is liquid.
To summarize, the at the moment out there LiFePO4 batteries usually are not solid-state batteries, however there might be a Lithium Iron Phosphate solid-state battery sooner or later if researchers determine a option to make them effectively.
By How A lot Can LiFePO4 Batteries Be Discharged?
Not like Lead-acid batteries (which really useful DoD is 50%), LiFePO4 batteries could be frequently discharged to 100% DoD with out struggling any main efficiency points. Nonetheless, doing so can drastically scale back your LiFePO4 battery’s life cycle.
Subsequently, if you wish to get probably the most out of your LiFePO4 battery, you need to test the consumer guide for the really useful most Depth of Discharge (DoD).
Normally, producers suggest a DoD of 80% for LiFePO4 batteries. After that, you need to recharge your battery.
This apply maximizes your LiFePO4 battery’s life cycle and total efficiency.
Last Ideas
Regardless of the excessive upfront price, a LiFePO4 battery gives many benefits for photo voltaic vitality storage programs, equivalent to larger DoD, lengthy sturdiness, larger vitality density, and light-weight.
However to get pleasure from all of the perks your LiFePO4 gives, it’s 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 aware of these ideas, you need to use the LiFePO4 State Of Cost Charts offered on this article to find out your battery’s state of cost. This will turn out to be useful when you could estimate how a lot capability your battery can nonetheless present.
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