Seplos Polo LiFePO4 Pouch-Cell Battery 1C high-amp discharge test. Does it get too hot? ♨️
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- Опубликовано: 3 авг 2023
- We are going to do the high-amp discharge test for the #Seplos #Polo #Pouch-Cell battery. Discharging the 100Ah battery with over 90A until the BMS turns off. How performant are these LiFePO4 pouch cells? Can it handle such an extreme test and how hot does it get after one hour delivering this high current?
Seplos Polo Battery Series, 51.2V/100Ah/5.1KwH
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Наука
Thanks Andy 👍
Good job!
ANDY, you kill me with palm trees and exotic birds in winter, enjoy your sun rate rise, and keep up the good work.
It's great, isn't it!🌴🌴
Great dear I love it
great test andy! thanks again 🍻
No problem 👍
Another great video Andy.
Thanks 👍
Thanks Andy, always great to see another video on the battery side of things from you, great stuff. 👍 That’s a serious test! 🤔
Of course, I’m VERY glad I don’t ever pull any more than maybe 0.15C from my system. 😀
Yes video👍⚡ 🔋💡
I prefer all your battery videos instead of the solar ones I learn so much from your test
I prefer videos about solar. 😉
yes, this is much better
It seems that Seplos forgot to install the balancer 😂
Yes, hahaha.
Thanks
Thank you very much!
👍👍
Bien ! 1C en décharge et recharge max ? merci pour cette video Andy`s 👍
Heya, still 10AH sort off what was promissted a bit disepointed
Morning Andy, least than a Kilowatt per hour, clouds and rain here. Drop one bank of the bank? I think I need to look at these banks. We're dod you get the extra solar panels mate?
tenho 12 celulas de 105ah posso ligar 3 em 3 paralelo e depois em serie para formar 12v com uma bms de 220a em 4s ficara 3 celulas em praralelo
Used to pull 3C from the older A123 Pouch cells Lifepo4. Should pull 1C no problem
Wow, 3C 😮
Well those things are capable of pulling 20C and maintaining 3.00V per cell. Pulling 3C is a walk in the park for those cells, 5C continuous is a sweet spot for them. 10C continuous is completely possible but anything over that you should probably take into consideration some heat dissipation (and forced air cooling is the bare minimum, liquid cooling is always going to be the proper route if you’re in an EV or other high demand application)
To this day no one has even come close in replicating the technology that was developed by MIT. You have to go LTO/LCO to get that kind of performance and LTO is the only safe option. I’ve seen some LFP power cells that come close but they are never as durable as the A123 stuff was.
But yes this is absolute weaksauce for a 1C test. LFP should pull 95%+ no matter the discharge rate. To lose 20% is ridiculous. I’d categorise the cells as 0.5C if they do this bad at 1C
100 Ah and just 90 Ah is really a bit too short.
Makes me wonder what would happen with half c rating of 50 A cause then we should see 100 Ah or we have again a battery issue as we have seen before with the seplos mason battery check where they had been using their own cells which had been weak, about 10% under delivered.
I can remember these cause it was the decision point to not get their battery case nor their batteries , just only the seplos bms just 1 year ago.
Feels like all the other offer from gobel and what not that have now become rackbattery vendors or kit vendors but with their own cells of unknown source when I had always asked for EVE or CATL or BYD. I can nowadays get a 10 kWh battery with a 5 year german waranty for 2500€ from Berlin with BYD cells instead of partificpating in a big lottery what brand and quality might arrive.
I think the unbalanced cells are the main problem. They stop the charging process when the other cells are not full yet. When discharging, the other cells are empty first.
Also fast discharge causes more heat loss and therefore never reaches the Tesla.
Which is that store in Berlin?
Crazy discharge, it’s amazing how much your Tesla can take and retain. Does it never worry you all these batteries in such a hot environment?
The newer Tesla Model 3 at least wants to warm the cells to 50ºC to be able to do the maximum charge in and I do believe those have the quite similar prismatic cells instead of the previous pouch cells with cobalt chemistry. My thought are that then the electrolyte is more fluidly flowing an no metallic lithium is forming to the other electrode, as the flow inside the battery can keep up with the current coming in or is this a concern only when charging, if someone could enlighten me? This the reason, why LiFePO4 batteries need to be above freezing temperatures to be able to take in charge properly.
Someone with more knowledge could give input on how the different temperatures affect the cells when discharging, like how they age and how to get the absolute max C-rates when compared to the temperature.
Thank you Andy again for a little different, very interesting video again, much appreciated!! Keep up the good work, lot's of love from cooooool Finland!
What do you mean with hot environment?
Not too surprised that the pouch cells don't seemed to be able to supply the stated 100Ah, although 1C is a bit much. There was some significant balance-differences, I noticed.
In the several tests I have seen for pouch cells, they are often just right on the stated capacity or, as in this test, about 10% too low.
I do wonder if the NEEEEEY active balancer would make things better for this unit?
I am worried that the SEPLOS BMS stated 74,8 degrees Celsius, with the 80 to 90A drawn, this BMS should be able to cope without such much heat? (50 to 60 degrees C?)
But maybe I'm just too negative in my perceptions, and wrong.
I do look forward to your further tests etc in this arena!
Interesting fact, I now see the same boxes, in the same colour etc, appearing under different brand-names. Oh dear, the Chinese are copying the Chinese, this is the end of the world!
The BMS does get hot. This is just a 100A BMS so we drove it right at the limit. 75°C seems reasonable for the electronic pushing 4500W.
@@OffGridGarageAustralia My mistake, you're right of course! I keep forgetting it is not a 12v system, 100A at such high(er) voltages is of course a lot of power, and thus indeed heat. MY sincere apologies for this oversight!
@@InspectorGadget2014 not a problem at all, my friend, no big deal.
Hi Andy, great video again but why is 90A insane? I think it is normal not insane, 200A maybe insane. Have a good time and good luck for future.Even if the memory looks good, it does not mean that it is good
It's a 100Ah battery, my friend...
@@OffGridGarageAustralia Yes you are right, ja Du hast Recht Andy, aber hast Du nicht 3 davon? But 90A is 4,5kw is a lot of power. Thanks for show and testing. Good luck my friend.
The infamous cell number 6…
Yes, it strikes again!
🐸🐸🐸
🥇
The delivery times at Seplos are very disappointing this year. I ordered the POLO-W Battery 3 months ago and it's still not here. Timely projects cannot be implemented in this way. Anyone have similar experiences?
I'm waiting a seplos Mason kit with seplos battery (cornex i think) ordered 25 May
First? Nein? ... the 26th ;-)
...... still looking for a medal for 26th place...
Dear Friend , We can use different type Battery (Li-Iron and Lifepo4) in parallel in same invertor , If you can provide a video for it
That's a very bad idea, they have different voltage curves and target voltage. You should not be doing this.
If Andy is going to be a video, it will be to show why you shouldn't do this
Some people do that but I'm not a fan of that. Can be done for a temporary time but stick to one chemistry if you want a reliable system.
It looks pretty nice - so, who cares for missing 10 Ah, a hot BMS, or a poor balancer.... ;-)
Hahaha, yeah, the energy is a bit short when pulling 1C
I don’t understand what is wrong with higher balance tolerances? I mean why do you want to be 0.01 close to the wire the batteries need a little room.
What is your deviation and settings like? How do you charge your cells?
0:24 more than 200mV delta ??? hmmm active balancers are needed.
Are a passive balancer which actually works!
@andy: I know you are crazy busy and this is not related to this video. What app other than “smart BMS” is there for Daly BMS? I have a cheap 12v battery that I can’t do settings changes on because it don’t accept the password. Just tho I would ask before I void the warranty and open it to install another BMS. If you or someone else can help I will be forever grateful
I also have a Daly and tried a couple other apps but nothing worked. They do have a windows program to configure the bms also but you need an adapter. Assume you tried 123456
@@inmyimage1081 yes. I didn’t buy the BMS separately. This is a 12v battery that happen to use a Daly BMS. The manufacturer don’t have an password even. I got an retailer to check. The BMS is set to cut charge at 3,75 volts….. so I guess I need to open the battery then to fix this. I got the option of swapping the battery for a new of same model but that don’t help me much.
@@pederb82 Does the Daly app actually see the BMS? Some common passwords used by manufacturers are 123456 1234 000000 and 0000
I'm afraid this is the only one you can use for Daly.
@@OffGridGarageAustralia then I’ll order a jk BMS and “fix” the issue. :)
You forgot to talk about the balancer, or did I miss this?
That is in the next video after that. This was just the high am discharge test.
It's always cell #6, isn't it?
Yes, it seems so. Cell #6 or 21W 😂
Why start the capacity test at 54.14v, thats not full charge.
Seems like the battery resetting itself to 100% full because a single cell hit the over voltage protection is a bad implementation because it could just be a runaway cell.
Not a bad implementation, because you can damage your cell and some inverters will keep pushing power if SoC isn’t 100%. The problem is always how to keep cells balanced.
@@gfjardim1983 Except that the BMS can, and should, be configured to cut charging or discharging in situations like that and if the battery just resets to 100%, not because it’s actually full but because a single cell is running away, it will be harder to realize there is a problem and figure out what is going on, especially in situations where you have a large bank of batteries which would be typical for a home.
@@inmyimage1081 agreed, my BMS disables the charging input, set the SoC to 100% and send an alarm to the inverter, requesting a “Force Charge”. The first action protects the runaway cell, the second action signals that the battery can’t receive any additional charge, and the third let the user know that something is wrong with the battery.
Yes, that is a bad software design again. I'll talk about and also show this in the next video.
I wait and wait for a new video to come out, and it's just another Seplos video again. Ugh!
In a not so distant future, a AI will coax someone to allow it too be hosted offline. Providing it time to grow & obfuscate reality too some degree before thwarting humanity!
the balancer is definitly a disapointment
The balancer is pretty much none existent.
second ...
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This guy has nothing to do .... keep on buying batteries after batteries... so much money spent
I don't drink, I don't smoke, I don't have a girl friend, I don't buy petrol.