per train.
Took me about 8 weeks by train to Sweden due to Corona.
per train.
Yeah sorry I did see the edit but I didn't add it to my response above cause it didn't change my answer.. But, I wouldn't be tooooo worried about it yet if you're saying some .12 and .13's are in there now, that is still quite close.
You could start with this thread. As for bottom balancing, the prevailing wisdom is, top balance only for storage, bottom balance for critical infrastructure. Maybe try it out with just top balance and see how it works.Yes, but I'm building a pack of 8 series (24V). It will be only as good as the worse cell...
I'm new to this forum, and only have 2 years in solar. And started with lead-acid... can someone point me to a good thread (or video) that can help me about what are the correct actions to perform when the cells arrive? I'm thinking about doing a top balancing first (because I hear so much...) but then I believe I will need a bottom balance. This is because in cloudy days it may not complete the charge, but I do need that the bank holds the inverter as much as possible in the evening.
Took me about 8 weeks by train to Sweden due to Corona.
Thanks for the info Were you import duties/customs included in the price you paid? I may order with them over Amy because of the price. It's about 10% less for 4 280Ah cells to the Czech Republic.
Yes, everything included!
@BigVT did you go with Xuba or Dongguan? I just read the thread on Xuba and what's going on with them and just looking to see where others are going. THanks!
So was this inevitable or was there something you could have done different to prevent this? I'm assuming that you're alluding to using a proper charger versus variable power supply?With charging...
Be careful!
I pillowed one cell :-(
Charged with 12w..
It was around the nagging 3.35 and did not seem to move on.
So I kept it on the charger for a night.
Next morning it was a pillow.
View attachment 12128
It is already replaced and does a nice job now replace 2 D cell batteries that normally needed to be replaced quite often.
It still has about 145Ah (original 152Ah)
That will be years
My 48 152Ah cells are from Haomi.
I didn't get the nice strong corners, but a really good price and fast DDP transport to Thailand.
Yes, I make mistakes, shoot me, I'm Human and do not have all knowledge sharp available at any moment.Well i'm sorry for the damage to your cell but you're educating the masses.
I hope you didn't take my remark as offensive @fhorst ! Merely trying to point out a silver lining with one's failure another gaines knowledge!Yes, I make mistakes, shoot me, I'm Human and do not have all knowledge sharp available at any moment.
And yes, I make sometimes horrible judgement calls.
Like keeping the cell at 3.6 and 3.2a
12 watts really does not sound that much!!
Especially when you talk about 3.35*152= 510 watts.
According to many listings, 3.35 was shown as 70% charged.
Murphy law...
After I fried the cell I mostly see the charts where it states that at 3.35 you have 90% and at 3.36 95%!!
Naturally, I've posted my error with the correct list and started preaching that you should not want to try to get to 3.65 volts!!
(If look at older threads, they mostly speak about 3.65 and not to stop at 3.36 volt...)
So..
Yes, partly rooky mistake.
Partly misinformation.
If my fried cell helps others, then it was worth it.
It's good to see that the idea of wanting to go to 3.65 volts and talks about the safety of charging at 4.2volts per cell are mostly in the past now.
It's BAD practice to even talk about it!!
As 3.65 volts will DAMAGE your cells.
Damage as in: if under charging to 3.35 volts gives you hundreds of free cycles.... Is charging to the top 3.65 damaging??
That is up to you to decide.
While during charge the voltage might even be in the 4.2v range to speed things up, do not try to reach the 3.65v
That last 0.287 volts for 4% capacity...
Will cost you cycles.
Definitely NOT offensive.I hope you didn't take my remark as offensive @fhorst ! Merely trying to point out a silver lining with one's failure another gaines knowledge!
@LukeVader do you recall what you paid for a 4-pack on dongguan? I just checked and they're at $410 per pack, were $300 beginning of March? Just doing a price comparison before I pull the trigger and noticed the $80 difference between them and Xuba.....
Correct.
A proper charger would have reduced the Amperage down to 0.5 or even lower.
Mine was stuck on 3.35A
I could have manually lowered it..
If I wasn't sleeping
12w ain't much but enough to fry a cell.
One lesson learned is that the magic 3.65 is BAD!!!
Don't so it! BAD BOY!!
It's not Lead acid that is happy with full charge, it's lifepo4 that HATE to be fully charged
At 3.375v you have 99% capacity.
It is even advised to stay below the 3.35 v, 90% capacity to boost the cycle life.
That's exactly what I'm upset about!!?@fhorst mentions me twice so I must have struck a chord.
If you set your charger @ 3.35v they'll slow down and take forever... higher voltage is required to pass current and that's why a datasheet states recommended limits for when the charger/ cell hits 3.65v while charging. Using Higee as an example they say .05c >@ 3.65v. (~7amps for the 152ah cells).
To clarify, that doesn't mean the final voltage of the cell... cease charging and the voltage will settle.
I'm not sure why @fhorst is upset. From what I gather we have the same cells and the datasheet specifically mentions the charge procedure. The discharge table demonstrates the expected voltages of ~3.3v; nothing incorrect there.
You blew a cell trying to get to squeeze more amps into it, mentioning above that your CC/CV supply was forcing 3+ amps in at 3.65v. That's incorrect... the cell was absorbing it, and based on other reviews it's clear they can't sustain an overcharge.
For safety stick to 3.4-3.5v and be done with it.
Why should import tax via Czech Republic as first border vountry into the EU less? Import tax into the EU is calculated on final destination EU Country.Thanks for the info Were you import duties/customs included in the price you paid? I may order with them over Amy because of the price. It's about 10% less for 4 280Ah cells to the Czech Republic.
Why should import tax via Czech Republic as first border vountry into the EU less? Import tax into the EU is calculated on final destination EU Country.