48V vs 51.2V LiFePO4 Batteries, What’s The Difference?

Just answering a viewer’s question. Hope this helps! Have questions as well? Put in comments and I will try to help best I can!

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[upcountryprepper]

Thanks for this video I use 12v but great info

[solardiyhobbyandrevies]

Haven’t made it that high in voltage yet. 24 volt is my biggest system. Thanks for the heads up if I ever build a bigger system.

[JR-xwdk]

I have seen some listings that were 15s, but in the image they would have a blank one to make it look like a 16s. Not good.

[jeffhuntley]

I learned something new today. Thank you!

[Sylvan_dB]

I strongly recommend to avoid the 15S batteries. These standards are all originally derived from lead-acid which would be 2.1v/cell with 24 cells in series (24S), or an operating range of 42v to 58v. The 15S LiFePO4 peaks out under 55v. The 16s LiFePO4 is more universal, being the same as 4x12v in series or 2x24v in series, both resulting in 16S LiFePO4 cells.

[junkerzn]

The industry standard for LiFePO4 "48V" batteries is (and has always been) 16s. That is 51.2V nominal, 56.8V charge target, and a 53.6V-54.0V float. At 48.0V a 16s battery will be 95% empty. This makes it highly desirable.

Some vendors tried to lowball people by selling 15s packs because they could advertise them as "48V" even though they were one cell short of the standard. It turned into a marketing mess and unfortunately a lot of people fell for it and got stuck with them. A 15s pack is 48.0V nominal, 53.25V target, 50.25V-50.625V float.

The problem with 15s is that 95% discharged will be down at 45.0V and many inverters and other pieces of gear have higher low-voltage cut-offs and so are unable to use the full capacity of the batteries. Plus at higher power levels the voltage sag will cause warning bleeps, whistles, beeps, and creeps and... it gets annoying.

They cannot be mixed. People should definitely go with 16s in all circumstances and avoid 15s LiFePO4 batteries.

-Matt

[mendozaconsultation]

Ever heard off the Paoweric 12v 300ah lifepo4 Battery.?

[overlooord]

Do you know if the newer Growatt inverters only will work with their own batteries?
Ex. the MOD10KTL-XC in the specs it says it's only compatible with their ARK-XC battery. My question is becourse those are quite expensive compared to other non-growatt batteries and i'm worried that I will be "Vendor locked" if i buy a Growatt inverter.

My 8kw Outback Radian inverter has a max safe operating voltage of 65vdc listed in the factory specs. so I built 2x 300a 17 cell LifePo4 batteries to give me 54.4v battery packs that I charge to 60.2vdc.. This creates a far more efficient low end when the system stops pulling current from the batteries at 49.6v thus the electronics are not pulling a higher rate of amps which cause more heat and stress.. I could if it was an emergency run them down to 45v but this is the point that damage is occurring to both the batteries and inverter so I rally have no desire or plans for this.. Beware that 5.12kw capacity because this is unsafe max charge to that unsafe minimum charge where cell degradation happens and the lifespan of the cells is vastly reduced.. At no lower than 2.8v and no higher than 3.6v per cell you double the life of the battery over the 2.5v and 3.65v discharge/charge cycle for maybe 5 amps of current..

[billm]

Thanks for the explanation! I appreciate your efforts! 🙏🏼🫡