Questions tagged [lifepo4]
All related to lithium iron phosphate (or LFP) batteries
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Layout of a LiFePo battery pack with serial and parallel cells
Due to space I need to build a LiFePo battery pack with 8 individual cells.
Each individual cell has 12V and 50 Ah, and the pack has to have 24V and 200 Ah. This would be the specific cell I plan on ...
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Charging 4 parallel banks of 4 in series LifePO4, 16 total batteries. that have been top balanced
16 each LifePO4 batteries. 12.8Vdc 300Ah (Jita), an alleged internal BMS, charge by four SunGold Power SP6548 inverters, configured so two are providing 120VAC for phase 1 and two are providing 120VAC ...
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How much charging ripple voltage is allowed while charging a LiFePO4 battery?
We are designing a buck controller to charge a LiFePO4 battery (4 series 9 parallel cells, each of 3.2 V).
Hence, we would like to charge the battery pack with 13.90 V but the buck output has got a ...
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Can LiFePo4 batteries be charged using an SMPS with adjustable voltage output?
Some Switched Mode Power Supplies offer a potentiometer to adjust their output DC voltage. Mean well's LRS-350-24 power supply for instance has an adjustable range of 21.6 ~ 28.8V. Can it be used to ...
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LiFePO4 battery charger and inverter in parallel
I've got a brand new LiFePO4 battery (200 Ah) with internal BMS, got the Blue Smart IP65 Charger from Victron Energy and an inverter.
The easiest way to connect them is in parallel (off course adding ...
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50 W solar panel and a simple PWM solar charge controller at 14.1 V to keep a 12 V 50 Ah LiFePO4 battery charged?
I have a solid-state PWM charge controller with a regulation voltage of 14.1 V. Can I safely use this to keep a 12 V 50 Ah LiFePO4 battery charged? I understand that the PWM controller is less ...
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What is the IC used for 19-cell LiFePo4 BMS design? [closed]
I am trying to design a BMS for 19-cell (19S7P) LFP battery pack, for one of the two wheeler scooter application. I can see that, there are many IC chips including MPF42790, MPF42791 etc are available ...
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Can all BMS have their load and charge ports connected together?
I bought this e-scooter LiFePo4 battery that comes with separate charge and load ports.
My goal was to then connect them together so I end up with only 2 wires and the battery will get into charge or ...
user258881
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Drop in charging current, could it be an issue in the long run?
Recently, I've noticed a slight decrease in charging current for my 8s LiFePO4 battery after around 7 charge cycles. The charger used to deliver 1.48A, but now it charges at around 1.45A. I'm ...
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Alternate way to AC charge LiFePO4 pack
Firstly, I am aware that a similar question exists.
That being said, I have built a portable power station comprised of a 24V 25Ah LiFePO4 battery in an 8S1P configuration. From this I am able to run ...
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Two-transistor latch modified to include a second input and reset
(Rewritten from scratch and with a better starting point)
I want to use a separate battery to start my engine. It's a LiFePO4 battery so it has an electronic BMS to control charging & discharging ...
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Use and monitor a LiFePO4 battery with a microcontroller
I am planning to build a small robot using a Raspberry Pi Pico microcontroller and DC motors. I am considering to use a single cell LiFePO4 battery.
After some research, it looks like many use a ...
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One battery in series never fully charges
I have two 12 V 110 Ah Eco Tree (LiFeP04) batteries wired in series with both batteries having the following technical specification:
Built-in BMS: Yes
Nominal voltage: 12.8 V
Nominal capacity: 110 ...
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USB-PD DRP from a single LiFePO4 cell
I am about starting a project with LiFePO4 pouch cells. The idea is to create a powerbank from a single cell. The powerbank must have an input/output USB C connector with 65W minimum power (100W ...
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End of life for LiFePo4 cells
Can anybody provide a reliable authoritative reference explaining succinctly why the "Remaining Useful Life" of an LFP cell would be low after capacity retention drops below 80%?
Background: ...
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Is it safe to use this weird lifepo4 charger [closed]
I have an 8S LiFePO4 battery pack which I tried to charge using my suspicious lithium battery charger. The charger applied a voltage slightly higher than the battery voltage at any moment to charge it ...
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48 V LiFePo4 BMS charge cycle
I have a question around BMS charge cycle stability.
I have a 48 V 250 Ah LiFePo4 battery connected to solar system with a 5.5 kW hybrid inverter.
The battery specs are 57.6 V float and max charge and ...
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Charging LiFePO₄ battery using TP4056
I'm working on a project that involves using a LiFePO₄ battery to power an ESP32 microcontroller without regulator to save energy.
I have a TP4056 Li-ion battery charger, which has a voltage of 4.2 V. ...
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What are the dangers of a fully charged LiFePO4 12 V, 100 Ah battery in home and only used for emergencies?
I have Goal Zero Yetis 1000X & 500x (plus several other smaller power banks) with GZ's Boulder 100 Solar case and some other 100 W solar panels I've used for camping. I mainly use all of this at ...
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Charge LiFePO4 pack with computer PSUs
I'm looking into building my own LiFePO₄ pack and I have my eye on a 50 Ah, 3.2 V cell that goes for about €50. I need 36 V, so that's 12S or €600.
I want to be able to charge it fast. On the 3.2 V ...
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Best way to detect failing batteries
I have a few IOT products scattered around long distances, they use solar and batteries to run. They are LiFePO4 12.4 V systems deployed in the South East US.
I have them report all the data available ...
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Distance between two pairs of 48 V, 5 kW LiFePO4 battery "pairs"
I am installing a large LiFePO4 battery system in my RV. I have four server rack mount 48 V, 100 Ah batteries (EG4-LifePower4). I would like to have two on each side of the RV for weight distribution. ...
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How to connect USB-to-RS485 adapter to RS485-RJ45 input of an LFP battery BMS? [closed]
I have Victron Multi 48/5000 connected to Cerbo GX. Works fine.
Now I need to connect Cerbo GX to the LFP battery, to RS485 (because no CAN input).
...
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Charge 12 V battery bank from a 24 V MPPT solar charge controller
I am planning on boondocking on my RV and am in the phase of designing the system and want to stay at 12 V. I have found the perfect solar panels for it, but the specs make them somewhat odd to wire:
...
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Identify battery chemistry
I have a small project where I would like to use a single 18650 LiFePO4 battery. Problem is that they are somewhat difficult to procure in very small quantities around where I currently live (Japan). ...
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LiFePO4 battery capacity, influence of temperature
The main question is, if Lithium Iron Phosphate batteries are regaining capacity when heated up.
Assume:
a nominal 3000mAh 3.2V cell @ 25°C
capacity at -20°C taken from datasheet is 1500mAh
battery ...
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First cell in series connection gets charged first
I have charged ~20 packs of 4S batteries and I noticed that cell connected to + on charge circuit almost always is the one who gets charged first (reaches full voltage). Is this a coincidence or is ...
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Charging a large array of LiFePO4 prismatic cells: How many is too many?
48 large (150Ah) LiFePO4 prismatic cells were wired in parallel (48P) for days to bring them all into balance; each cell metered 2.800 volts. Perfect!
It would seem possible to initially charge the ...
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Circuit diagram of LiFePo4 charger with additional battery protection
I want to design a small circuit board that includes a charge controller for a LiFePo4 battery and a protection circuit for the device behind it.
I use a vertical USB-C port for 5V Power-Input Texas ...
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Charging a LiFePO4 battery from an alternator
I have a power bank consisting of two LiFePO4 cells connected in parallel. They will used to power a range of 12 V electronics e.g. fans, fish finder, USB chargers, L.E.D lights and potentially a ...
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32650 LiFePO4 battery not charging
I have a problem charging my 32650 LiFePO4 battery. I have connected it to a 3.6 V power supply with a 1 A limit. I also connected my multimeter to check the amperage to my battery. When I start ...
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What concerns should I have when using per-cell charging in a LiFePO4 design?
I've started looking at using 26650 LiFePO4 cells in various (personal use) systems. I've been learning a lot on the topic lately, including how cell balancing systems actually work. While passively ...
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Charger for a 32650 LIFEPO4 BATTERY PACK 4S2P 12.8V 10AH -12AH
Good day. I ordered a 4s2p LIFEPO4 battery online and it odes not come with a charger. I'm wondering what specific kind of charger do I need for this battery. Specs and the link of the battery are ...
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MOSFET heats up quickly in High power 14V DC-DC bidirectional charging circuit
I am currently design the following circuit to charge a 14V LifePO4 4 cells battery while running a high power motor at 14V 24A. There are some issues that I am currently facing:
Without any diodes ...
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My 15S BMS of LiFePO4 battery stack outputs 15.9 V (the entire pack measures 48 V)
I have a LiFePO4 stack of 15S and 3P configuration.
Everything was working fine until I broke the pack and divided it into two packs of 8S and 7S, and connected both via jumper wires. Now the pack ...
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Adding 12V power supply to existing Solar MPPT load circuit
I have a camper which has a small 12v power system consisting of a 50w solar panel, a generic 20ah LiFeP04 battery, an a 15A Victron MPPT controller whose 12v load output feeds directly to a fuse ...
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Will it be safe to give 14.7 VDC to this network switch rated for 12VDC? [closed]
I have a number of video devices and a 1GbE network switch which are being powered by a 12VDC LiFePo4 battery via a DC power distribution module, using powerpole connectors.
All of the devices are ...
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General design approach to LiFePO4 charging
I'm trying to design a charging circuit for a 12V 120Ah LiFePO4 battery pack from a DC generator. Part of the project that the battery powers contains a Pi, and I'm not sure whether it's clever to ...
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How to combine two 48 V DC power sources for redundancy?
CONTEXT:
I am building a new system to power my servers rack. There will be 2 separate LifePo4 battery packs of 48 V 50 Ah, each with their own charger connected 24/7. This will act as a UPS.
From ...
user258881
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Can DC DC converter (CCCV) + BMS charge Lithium Polymer batteries
I need some help in clarifying my understanding on charging Lithium Polymer batteries.
Context:
I am trying to build DIY vacuum cleaner bot. For that I need a LiPo batteries which bot could charge ...
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LifePO4 + regular charger
What happens if I try to charge a LiFePO4 battery from the car alternator?
I have a X30 LiFePO4 battery (https://cara-tech-24.eu/en/electric/278-powerxtreme-x30-battery-lifep04-battery.html) in my ...
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LiFePO4 Battery, fuse, and resistor needs when using a 12V DC to 120V AC inverter?
I am new to micro power grids and learning how to use DC-power storage with AC-powered devices. In researching the topic I have read some unsubstantiated points I want to clarify.
Battery: Apparently ...
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Charging 3.2V 6000mAh LiFePO4 batteries (32700)
I bought one 3.2 volt 6Ah LiFePO4 battery, which is called 32700:
For charging, I have a lot of li-ion TP4056 charging modules, but I have read that these batteries differ from lithium-ion batteries.
...
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50 amp hour and 100 amp hour lifepo4 batteries in series
I have four 12 V, 50 amp hour lifepo4 batteries running in series, so 48 V. I need to increase the capacity of the battery bank. Can I get four 100 12 V amp hour batteries and create 4 sets of 150 amp ...
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Regulating 12.8 V, 240 W from a LiFePO4 to 12 V for computer
I have a LiFePO4 12.8 V, 20 Ah capable of 244 watts. I am trying to power a computer that needs regulated 12 V that will need 200 W. The regulators I find on Amazon don't cut it. The ones that handle ...
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LiFePO4 or 'Standard' lithium (Chinese cell) pack for e-moped build
I am trying to build my own e-moped for university in Hawaii and I am in need of some advise for the right pack. I currently have two orders awaiting payment on alibaba. They are both 48v 50ah and I ...
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Possibly connect second charger to Lithium Iron Phosphate battery
I have a sump pump system that includes a 12 volt backup sump pump. It is managed by this Pump Spy system: https://www.amazon.com/PumpSpy-PS2000-Battery-Internet-Monitoring/dp/B07N8FY4L9
I have a ...
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Current limiting at 100 amps
What options exist for limiting current in this scenario?
I have been searching for an option and it looks like I need to reduce the field on the alternator but I don't understand enough to know if ...
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Can LiFePO4 BMSes be connected in parallel without causing charge/discharge issues?
I have two LiFePO4 battery packs in 4S configuration: one with 2x4 cells (4S2P) and one with 3x4 (4S3P) cells. Each pack has a 4S BMS.
Are there any potential issues with connecting those two in ...
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Charging LiFePO4 with high voltage but low current?
I'm trying to charge a 230 volt 24 kW bank of LiFePO4 batteries.
It's difficult to generate the right charging voltage because it needs about 250 volts and most inverters don't do that. It's usually ...
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