NewStats: 3,261,888 , 8,175,464 topics. Date: Friday, 30 May 2025 at 10:04 PM 53g5o

Intellab:

Parallel. I changed it to series an 2 hours ago.

Increase the s.....2 s aint enough to charge an 8kwh battery.

Obnoxious2001:


Send to service centre that's the only solution

I sent them an email already, like two days ago, but no reply yet.

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GloryJoyeux:


More cycles? Hmm.

6000/365 days is 16 years.

Read up on calendar aging, I don’t even know what you are arguing. You initially said they rate 6000 cycles at 0.3c and below. Unfortunately you seem to not then understand basic chemistry if you are waiting for lfp at 0.2c to give you more.

Hope you know that in the industry batteries are rates on the energy they can deliver in their lifetime. How much energy are you not expecting your cell to deliver at a measly 0.2c in its lifetime before calendar aging?

What exactly is malicious about me not showing you for free how I prompted the AI. Do you know AI prompting/querying is a skill that people pay to develop and learn?

So its the cheap, rejected and 2nd life cells most of us are using in Nigeria that are capable of 6000 cycles shey?

When we purchased the Sako 10kw battery we bought in Dec, the sales rep declared that at N2.1m we were getting cells from the "top 10 lithium battery manufacturers in china" but if we paid N2.6m we'd get cells from "the top 3".... it's obvious like most Nigerians what option we went for.

I'd prepared a proper response to you, but I've been banned 5 times already (due to that reply) so I'll have to wait till tomorrow when I can post images again.

I just hope this discussion has helped people to realise that every advice given here might not be altruistic afterall and you have to be able to read between the lines and decide for yourself.

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GloryJoyeux:


You are beginning to sound like you have a learning deficiency.

Did anyone here expect 6000 cycles from their grade B cells.

I don’t even understand your argument. If you still charge your grade B cells at 0.5C you still get more value than at 0.2C.

If you wanted and love 0.2C charging so badly why didn’t you stick with lead acid?

This same lfp along with their nmc brothers are doing 1C constantly in HV ev connections with dc super chargers, they are powering electric motors in evs deliver record 0-60mph speeds in evs, and here you are for the past 2 hours advocating for 0.2C charging.

Tbf EVs are hardly using the quality of cells we have in this market. I'm sure there's a massive, massive gap in quality. For example, The Xiaomi SU7 ultra has just a 93.7KWH battery but can output 1548 HP. Over 1MW. That's about 11C discharge. You think a Felicity battery can handle that?

Secondly, those same EVs start degrading noticeably within like five years, which may just be ~1200 cycles. The high charge and discharge rates are undoubtedly a factor.

Can your average lifepo4 cell handle 0.5c charging without issues? Why not. Would 0.2c objectively and scientifically be less stressful on the cells? Also yes. By how much is what we don't know. I think charging at 0.2-0.3c is a perfectly fine way to use lifepo4 here, especially considering the quality of cells we get.

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GloryJoyeux:


Grade A, Grade B it doesn’t matter, lfp can go 0.5C without issues.

Look at the datasheet of new LF280k it says 6000 cycles at 0.5C, now lets imagine its grade B, it is still a 0.5C discharge test. It is 0.5C till end of life, it doesn’t mean because its harvested cells it should now be 0.2C.

For crying out loud, what do you guys even think is the benefit of lfp in the first place.

I give up!

Surely this works under the assumption that battery degradation is linear, when it's factually not.

Also the whole point of my point was you using EVs as proof of the tolerance of LFP. I don't agree with that.

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@twinstaiye @Seun

Please I have been banned by spam bot 6 times while trying to reply to only one poster today? Are some of this forum more protected than others?? Please help me check all is well, in case I am banned again now

@twinstaiye @Seun

It is a big shame that we are now forced to filter healthy arguments through AI to beat this overtly aggressive spambot. A big shame. Banned 7 times in a day.

HeavenlyBang:


Tbf EVs are hardly using the quality of cells we have in this market. I'm sure there's a massive, massive gap in quality. For example, The Xiaomi SU7 ultra has just a 93.7KWH battery but can output 1548 HP. Over 1MW. That's about 11C discharge. You think a Felicity battery can handle that?

Secondly, those same EVs start degrading noticeably within like five years, which may just be ~1200 cycles. The high charge and discharge rates are undoubtedly a factor.

Can your average lifepo4 cell handle 0.5c charging without issues? Why not. Would 0.2c objectively and scientifically be less stressful on the cells? Also yes. By how much is what we don't know. I think charging at 0.2-0.3c is a perfectly fine way to use lifepo4 here, especially considering the quality of cells we get.

Only time will tell bro. I have a mini grid in Aba with 10 pieces of Felicity 17.5kw battery and 6 pieces of Valto 16kw battery connected to 10 inverters (Valto has been to my site in person). We cycle daily and charge close to 0.5c. This is the 13th month in operation. There is no issue so far. Only time will tell if your theory holds up about less cycle life due to high charging rate.
Total DC System size is 350kw (Approx 600 pieces of 550 watts solar , diff manufacturers) Daily load demand is 315kw.
At 0.2c, the business will not make economical sense,. Not enough sun during rainy season to charge the batteries to full. My own research prior to starting the business and consultancy reports shows that 0.5c for lfp has no detriment on battery. I knew calendar aging will do me in rather than battery degradation.
My experience is based on real actual daily business experience
Here at my job in Atlanta, we have an electric car pool with DC fast charging. We have cars on the pool going on 5 years with no sign of battery degradation so far.

@Gloryjoyeux is more knowledgeable on this subject than me and can shed more light into this subject.

AndroBlaze:
@twinstaiye @Seun

Please I have been banned by spam bot 6 times while trying to reply to only one poster today? Are some of this forum more protected than others?? Please help me check all is well, in case I am banned again now

Bros, no body is saying you are wrong, you might be right but only time will tell.

GloryJoyeux:


Hi,

As an academic, I know your type. Because you have interests in a field doesn’t make you a professional, neither does it give you the go ahead to blindly argue for a cause with a seasoned professional. I will never argue a field you are a professional in but I will choose to learn.

My responses here are usually apt and well grounded, everyone can attest to that, and that is because I’m a seasoned professional.

My recent phd internship was with a contractor on electrify america, we installed and commissioned dc fast chargers for vw group and did one in San Francisco. I have also interned at Siemens in . Amongst others.

Now back to this argument.

Here is the big picture!

If you always charge at 0.2C, you waste time that could’ve been used to return energy also calendar aging eats into the battery life before cycles are fully used.

If you charge at 0.5C, you extract maximum value before time-based degradation sets in.

The extra charging time drags out your use of the battery, making it more likely that the battery degrades from age before you finish using its full cycle life. 0.5C gets the job done faster, and within the safe window of calendar aging — making it more efficient in the real world.

Many people believe charging a LiFePO₄ battery at 0.2C is better because it’s “gentler” and might increase lifespan — but when you consider real-world energy use, charging time, and unavoidable calendar aging, this strategy backfires.

In real-world use, 0.2C is a waste of time. There is no practical advantage over 0.5C, only the illusion of one.

I won’t respond to you anymore on if topic.

This response seems to be based more on assumptions than on what was actually said, addressing a point that wasn’t raised—perhaps in an effort to make a larger statement and fulfill a feeling of self.

To clarify for those genuinely interested:

Do I primarily charge my batteries at 0.2C or lower? No.

Have I ever told anyone they should charge at 0.2C or lower? No. I’ve always said: charge at whatever suits your needs. If that happens to be around 0.2C, then you’re in a good position to enjoy longer battery life.


Is it true that charging at 0.2C generally leads to better battery longevity compared to 0.5C? Yes, it is. All available data and discussions I’ve seen here this principle—slower charge rates tend to preserve a battery’s health over time.

So, while some may prefer to give fixed instructions, others—like myself—aim to share information that helps people understand the topic and learn .This should hopefully arm them with the ability make informed choices.

Best regards.

AI filtered

AI and Theories everywhere..
Make una dey try test and show workings.

Never depend on what some inverter display shows. For PV generation.

Tested 2 inverter:
one overstates PV input while the other slightly understate PV input

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KA24DETT:

Bros, no body is saying you are wrong, you might be right but only time will tell.

Its fine. It definitely did not start off about being right or wrong. It's just about providing as much information as possible for people to learn and choose their own path.

You can't have true understanding if you stick with what is said without understanding why it is said. Even if I don't agree with knowledge, I will still post it and acknowledge it, and I believe we all do that in certain ways in our dealings in life. .

AndroBlaze:


This response seems to be based more on assumptions than on what was actually said, addressing a point that wasn’t raised—perhaps in an effort to make a larger statement and fulfill a feeling of self.

To clarify for those genuinely interested:

Do I primarily charge my batteries at 0.2C or lower? No.

Have I ever told anyone they should charge at 0.2C or lower? No. I’ve always said: charge at whatever suits your needs. If that happens to be around 0.2C, then you’re in a good position to enjoy longer battery life.


Is it true that charging at 0.2C generally leads to better battery longevity compared to 0.5C? Yes, it is. All available data and discussions I’ve seen here this principle—slower charge rates tend to preserve a battery’s health over time.

So, while some may prefer to give fixed instructions, others—like myself—aim to share information that helps people understand the topic and learn .This should hopefully arm them with the ability make informed choices.

Best regards.

AI filtered

Bros, yall are saying the same thing. Your theory is that 0.2c increases longevity which might be true. He is saying 0.5c does not affect longevity but rather calendar ageing will do you in before the battery dies from high charge rate.. He is more geared towards efficiency rather than longevity. Both things can be right.
Its the same with lead acid and tubular battery charging with solar. Not enough sun hours to go through the charging cycle (bulk, absorb and float). Most lead acid batteries die of sulfation.

This chart should be helpful

fuckboys:
what about a 4mm solar cable on a 4 420w cworth s on 2pS2p Connections on 12v system.

That's 2parallel series 2parallel

HeavenlyBang:


Just now just now.

my belle Dey sweet me, I run go carry one before I hear sold out.

Mrreed:
This chart should be helpful

thanks chief

Dam5reey1:
AI and Theories everywhere..
Make una dey try test and show workings.

Never depend on what some inverter display shows. For PV generation.

Tested 2 inverter:
one overstates PV input while the other slightly understate PV input

That one that overstates is the weird one

fuckboys:
I didn’t get the battery anymore bro, I ended up returning it the next day and collecting 420w s with it. I ended up buying 4pcs of 420w Cworth s.


I have been looking for a great battery deal for a long time, this is the best deal of the decade. 3.6kwh for 450k is crazy.

I'm sure you have run tests on it, how's the performance so far? Meet your standards?

Kokatrends:


I'm sure you have run tests on it, how's the performance so far? Meet your standards?

someone on this thread already did a capacity tests on it and I was very satisfied with the performance.

fuckboys:
I didn’t get the battery anymore bro, I ended up returning it the next day and collecting 420w s with it. I ended up buying 4pcs of 420w Cworth s.


I have been looking for a great battery deal for a long time, this is the best deal of the decade. 3.6kwh for 450k is crazy.

450k for 3.6kwh is not even as crazy as you think, Deriy offers similar price for brand new Grade A cells with smart bms and you can monitor voltage of individual cells

Apparently you can't have it all in this battery market .

CuteMaro:

450k for 3.6kwh is not even as crazy as you think, Deriy offers similar price for brand new Grade A cells with smart bms and you can monitor voltage of individual cells

Apparently you can't have it all in this battery market .

Deriy no dey group, Haisic battery saving life..
Not sure any individual will lay their hands on Deriy at that price anymore.

Anyways, I just recharged the batteries back and it took in 291AH..

Selling it off at 420k, for willing buyer, I have about 20kwh batteries and 2 units of 100AH 12V I can play with. This 3.6kw is unnecessary to keep in Lab.

I am covering the warranty stated on the batteries in any case.


Teardown was aborted due to Build quality. Unless I remove Laser welding cells cannot be revealed fully.

fuckboys:
someone on this thread already did a capacity tests on it and I was very satisfied with the performance.

Oh yes, maybe I wanted teardown 😂

I'm so curious what they packed inside to be able to sell at that price.

Makes me want to go the 12V route all over again. I hope it serves you well.

Dam5reey1:


Deriy no dey group, Haisic battery saving life..
Not sure any individual will lay their hands on Deriy at that price anymore.

Anyways, I just recharged the batteries back and it took in 291AH..

Selling it off at 420k, for willing buyer, I have about 20kwh batteries and 2 units of 100AH 12V I can play with. This 3.6kw is unnecessary to keep in Lab.

I am covering the warranty stated on the batteries in any case.


Teardown was aborted due to Build quality. Unless I remove Laser welding cells cannot be revealed fully.

I observed that this Haisic no get 24v batteries

You say?

ManAdii:

I observed that this Haisic no get 24v batteries