Alibaba LiFePo4 batteries

[Chefwhowa]

Assuming 8 cells, 280Ah each and assuming you're at 50% charge (you might be below that based on your voltage reading) at a 10A charge rate... 112 hours, or almost 5 days.

Oh my god wow, ok should I disconnect it and charge them up and than go back to top balance or should I just leave it alone and let do its job?

 

[upnorthandpersonal]

If you only have 2A (I thought you had 10?) you're looking at 23 days as @smoothJoey mentioned. You can put them in series and charge them that way with a charger, but don't do that without a BMS and set your cell cut-off over-voltage appropriately.

 

[John Frum]

If you only have 2A (I thought you had 10?) you're looking at 23 days as @smoothJoey mentioned. You can put them in series and charge them that way with a charger, but don't do that without a BMS and set your cell cut-off over-voltage appropriately.

Top Balancing LiFePo4 Cells using a low cost benchtop power supply.

To get the paper, click on the orange at the top of this page. This is a tutorial with detailed steps on how I top-balance my LiFePO4 Cells using a low-cost benchtop power supply. To get the tutorial, click on the orange "Download" button...

diysolarforum.com

 

[Chefwhowa]

If you only have 2A (I thought you had 10?) you're looking at 23 days as @smoothJoey mentioned. You can put them in series and charge them that way with a charger, but don't do that without a BMS and set your cell cut-off over-voltage appropriately.

Its a 10amp, ok would bigger wires help like gauge 4 or 2?

 

[upnorthandpersonal]

Its a 10amp, ok would bigger wires help like gauge 4 or 2?

If you're not getting 10A at 3.6V you need better (thicker) wire with good contacts. Generic leads that come with these supplies are undersized.

 

[Chefwhowa]

If you're not getting 10A at 3.6V you need better (thicker) wire with good contacts. Generic leads that come with these supplies are undersized.

Ok I have some thicker wires I can use

 

[Chefwhowa]

If you're not getting 10A at 3.6V you need better (thicker) wire with good contacts. Generic leads that come with these supplies are undersized.

How about 2 gauge? Or is that to big?

 

[upnorthandpersonal]

There is no thing as too big.

 

[Chefwhowa]

There is no thing as too big.

Heard that! Lol

 

[FilterGuy]

Note:
I don't know if you have followed the posts about damaging the threads in the cells..... but be very careful about putting screws or posts in and out as you switch back-and-forth between serial and parallel. Ideally, the first thing you do with new cells is put studs in with red locktite and never take them out again.

 

[FilterGuy]

should I disconnect it and charge them up and than go back to top balance or should I just leave it alone and let do its job?

That is a personal choice. Either way works. Just be careful of the threads on your terminals if you are changing things around.

 

[Chefwhowa]

There is no thing as too big.

Ok I'm getting 10 amps now with the 2 gauge wire. Thanks again

 

[Chefwhowa]

That is a personal choice. Either way works. Just be careful of the threads on your terminals if you are changing things around.

I'm not touching them right now just the lead wires going to the cells.

 

[FilterGuy]

Ok I'm getting 10 amps now with the 2 gauge wire. Thanks again

I'll bet the voltage at the cells went up too......

 

[Chefwhowa]

I'll bet the voltage at the cells went up too......

I'm at 3.272 right now

 

[FilterGuy]

I'm at 3.272 right now

That is not as much change as I expected...... but that just confirms the SOC of the cells is still pretty low.

BTW: 50% SOC is pretty typical for how cells are shipped.

 

[Bud Martin]

It took about 20 Hours for my battery, charging at around 15A.

SHENZEN BASEN 280Ah, I received my first order

You go in your order detail and there is a refund button. My post seems weird here, I add it cause out of 17 cells i received 16 of a kind and one different. Just to add to the idea that they send what they got, it's not very... professional. (My feeling). Thanks. I am curious, did they ship...

diysolarforum.com

 

[Chefwhowa]

That is not as much change as I expected...... but that just confirms the SOC of the cells is still pretty low.

BTW: 50% SOC is pretty typical for how cells are shipped.

Well I cant wait till it's done, they should give me alot of storage.

 

[John Frum]

@Chefwhowa put 2 awg leads on his benchtop psu.
That is probably a record.
Respect!

 

[Chefwhowa]

3.65 is fine but not necessary. Just keep an eye on it and make sure the voltage at the battery terminals does not exceed that. Don't rely on the meter that's on the power supply...

Ok another question, my charger is reading 3.61 but my batteries are reading all different numbers like 3.52, 3.35. Could that mean I could have a bad cell?