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Questions tagged [lifepo4]

All related to lithium iron phosphate (or LFP) batteries

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Do typical LiFePO4 BMSes react to voltage drop properly in case of charging high voltage cutoff?

Typical LiFePO4 BMSes have several protections: Temperature protection (low, high) High current / short circuit protection Low voltage protection during discharge High voltage protection during ...
juhist's user avatar
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1 vote
1 answer
41 views

Selecting the generator frequency for an active battery balancer

I started researching ways to balance batteries and settled on capacitive balancers. I found a diagram on them and most of them use NE555 to generate a square wave with a frequency of ~7 kHz and a ...
minto's user avatar
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1 answer
45 views

LiFEpo4 issues and concern

I have a 200AH LiFEpo4 battery and I bought an inverter, my inverter has 4 output AC socket if I connected the 1st socket to airconditioneer and and the 2nd socket to the charger continue charging ...
LOVE-LIGHT LIFE's user avatar
0 votes
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22 views

24S Lifepo4 battery draining

I built a 24s lifepo4 battery for my golf cart. I’m having an issue where under load cell 2 drops voltage while all others barely drop. Is this indicative of a bad cell? Or a poor connection? Any help ...
Cody Brown's user avatar
1 vote
1 answer
60 views

How can I protect a DC/DC converter when VIN is floating?

I'm using a L6902 (https://www.st.com/resource/en/datasheet/l6902.pdf) to charge a 4 cell lifepo4 pack (with a solid BMS). Do I need a diode on the converter output (PACK+) to prevent the converter ...
alexlroemer's user avatar
0 votes
1 answer
43 views

Does this battery pack allow load sharing setup?

I would like to use a pre-assembled 12V-rated LiFePO4 battery pack such as the one advertised here. Due to nature of intended use I'm currently focusing on a charging setup where the load is connected ...
lucenzo97's user avatar
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63 views

Switching 12V 50A with Arduino

I'm in the middle of building a DIY Powerstation with a 500W modified sine wave inverter. The battery is of type LiFePo4 and rated at 12.8 50Ah. The datasheet of the battery states that they recommend ...
Patrick's user avatar
  • 101
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1 answer
62 views

MPPT controller or charger into battery mangement IC?

Is it possible to add an MPPT controller (or charger?) upstream of a battery management IC that lacks solar input, as a means of supporting a solar power source? I'm finding battery management ICs ...
davegravy's user avatar
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0 answers
25 views

1 Solar panel to 2 mppt, to 2 separated batteries

In my motorhome I have 1 solar panel (500w) to a one victrom mppt 30A, to one battery 100A of lifePo4. Now I need more battery because i have a new 12v fridge, so I bought other battery 230A lifepo4, ...
Neme Hdg's user avatar
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0 answers
61 views

LiFePo4 Battery's BMS is clipping when my relay switch kicks-in

simulate this circuit – Schematic created using CircuitLab My trolling motor had no "kill-switch" that would turn the motor off should I get dumped into the water. So I purchased a ...
FishingFool's user avatar
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44 views

Adding one cell in parallel to help a bad cell in a LiFePO4 Batteries bank

I have a 8 cell 200ah GBS 24v battery bank on my boat. It is 6 years old and cycled about 1000 time probably. Just some background first: I bought the 8 cells from china direct as 2 x 12v packs. ...
SV Savannah's user avatar
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243 views

replacing a "li-ion" HFC (3,2v) battery

I have a device with containing 4 x (allegedly) "Li-Ion" HFC batteries in serial but voltage is not 3.7 but 3.2V. labelled values "Li-Ion 3.2v HFC1450 series 500mAh 1.6Wh" Just ...
Daniel Perez's user avatar
0 votes
1 answer
74 views

How to reduce voltage for step up converter input?

I'm planning to do something you will probably advise me not to - diy a sub $50 lifepo4 charger. So far (I think) I've got it figured out - I'll use boost converters in parallel, which should work if ...
php_nub_qq's user avatar
0 votes
0 answers
55 views

How to clean water damaged Lifepo4 batteries

What is the best way to clean water damaged rusted lithium Lifepo4 batteries? I have six used 16sXp 48v 5kwh server rack batteries that look to have been sitting in water and have rusted. There is ...
Justin Graham's user avatar
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0 answers
31 views

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 ...
Claudiu's user avatar
0 votes
0 answers
21 views

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 ...
Gary Fuller's user avatar
2 votes
2 answers
706 views

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 ...
Vishal Jha's user avatar
1 vote
1 answer
258 views

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 ...
A.Jesin's user avatar
  • 111
-1 votes
2 answers
338 views

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 ...
user348431's user avatar
1 vote
1 answer
70 views

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 ...
Preserved's user avatar
1 vote
1 answer
71 views

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 ...
ABD's user avatar
  • 11
1 vote
1 answer
288 views

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 ...
user avatar
0 votes
1 answer
158 views

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 ...
Shalan's user avatar
  • 103
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0 answers
79 views

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 ...
Flint's user avatar
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0 votes
0 answers
137 views

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 ...
Jonas's user avatar
  • 237
2 votes
2 answers
220 views

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 ...
A Dark Divided Gem's user avatar
0 votes
0 answers
89 views

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 ...
FrozenMind's user avatar
2 votes
0 answers
85 views

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: ...
John Rix's user avatar
  • 159
-2 votes
1 answer
111 views

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 ...
Akshat Sharma's user avatar
0 votes
0 answers
315 views

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. ...
Santiago Mercante's user avatar
2 votes
2 answers
3k views

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 ...
Ryan's user avatar
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1 vote
3 answers
472 views

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 ...
php_nub_qq's user avatar
2 votes
1 answer
70 views

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 ...
Dat_guy_who_hangs_out's user avatar
0 votes
1 answer
234 views

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. ...
mark1234's user avatar
  • 122
0 votes
1 answer
165 views

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). ...
Kirby's user avatar
  • 101
0 votes
1 answer
180 views

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: ...
vcliment89's user avatar
1 vote
0 answers
136 views

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). ...
laolux's user avatar
  • 143
1 vote
0 answers
41 views

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 ...
Jogitech's user avatar
  • 760
1 vote
0 answers
70 views

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 ...
Ri Di's user avatar
  • 1,039
1 vote
0 answers
144 views

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 ...
MorningCloud's user avatar
0 votes
0 answers
777 views

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 ...
ZolosBerry's user avatar
1 vote
1 answer
1k views

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 ...
adamsmalley's user avatar
0 votes
0 answers
265 views

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 ...
Abu Bakar's user avatar
0 votes
0 answers
43 views

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 ...
The Busy Wizard's user avatar
-1 votes
1 answer
269 views

Charger for a 32650 LIFEPO4 BATTERY PACK 4S2P 12.8V 10AH -12AH

Good day. I ordered a 4S2P LiFePo4 battery online and it does not come with a charger. I'm wondering what specific kind of charger I need for this battery. Specs and the link of the battery are below. ...
prime72's user avatar
0 votes
0 answers
89 views

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 ...
Ricochet3004's user avatar
1 vote
1 answer
252 views

Replacing a 12 V, 19 Ah lead-acid battery with a 12 V LiFePO4 battery

I have a Stanley PPRH7DS battery charger that came originally with a 12 V, 19 Ah lead-acid battery. This battery has since given up the ghost and I am looking to replace it. Last summer I constructed ...
Varwulf's user avatar
  • 11
1 vote
2 answers
566 views

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 ...
Prithivi Raj's user avatar
1 vote
0 answers
116 views

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 ...
Jartron's user avatar
  • 11
0 votes
1 answer
103 views

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 ...
sreategui's user avatar