Just ordered Lifepo4 prismatic cell 3.2V 280Ah lithium lifepo4

[deeuubee]

found my battery box!!!
View attachment 34540

Thanks for the photo set up. I'm about to do the same thing. You saved me a lot of time.

 

[GSXR1000]

mostly finished... running a window AC at 60 amps for 4 hours... turned out nice

 

[flgboy]

Enclosures are fun to think about and impment. Here is mine, the Tower of Power. I'm upgrading from lead acid to lithium when they arrive. Bottom is batteries with connection for MPPT, center section is a baffled inverter, so the fan airflow works without external fans needed, and 120V outlets on side.

 

[GSXR1000]

112 lbs...560ah is heavy

 

[GSXR1000]

BMS, shunt and fuse

 

[GSXR1000]

assembled. the case with spacers at each end providing compression at bottom and plastic coated all thread for top compression

 

[GSXR1000]

did I final load test... these are 272 AH batteries... load testes 12v 8 cell. at 80 amp load, it ran 567ah and 7.3kw.. very happy... 14.4v to 11.1v

 

[GSXR1000]

little battery drift at the end of charge 2.66-2.83... at most of the discharge they where very close

 

[John Frum]

What was the differential like when the battery was full?

 

[GSXR1000]

What was the differential like when the battery was full?

no... it didn't drift until last 10%... I am happy with them

 

[sshibly]

no... it didn't drift until last 10%... I am happy with them

Watch Mein Aussi Bru, he does a full test and the voltage take a dive right at the end, exactly as in the spec curve.

 

[GSXR1000]

Watch Mein Aussi Bru, he does a full test and the voltage take a dive right at the end, exactly as in the spec curve.

yes the 100%‐90% and 15%-0% the voltage moves fast.. the rest only .5 volt

 

[John Frum]

no... it didn't drift until last 10%... I am happy with them

I'm interested to see how well the pack re-converges at the top when you recharge.
Preferably with balancing disabled.
I have an idea that the further out of sync they get at the bottom the less they converge at the top.
I have a further idea to "titrate" the pack bandwidth based on the drift.
The low cell cutoff is set based on when the weak cell diverges $n mv.

 

[GSXR1000]

I am recharging right now.. at 13.3v and it is around .003v I will post screen shot when I get home

 

[John Frum]

I am recharging right now.. at 13.3v and it is around .003v I will post screen shot when I get home

Excellent so far!

 

[sshibly]

think sag when you draw, reverse when you charge, the readings mean nathang! ;-)

 

[GSXR1000]

I'm interested to see how well the pack re-converges at the top when you recharge.
Preferably with balancing disabled.
I have an idea that the further out of sync they get at the bottom the less they converge at the top.
I have a further idea to "titrate" the pack bandwidth based on the drift.
The low cell cutoff is set based on when the weak cell diverges $n mv.

 

[GSXR1000]

under temp charging cut off works also

 

[Deleted member 1888]

I just ordered 16 of them to make 2 24v batteries the price has gone WAY UP, it cost me $2185 after tax. Just 2 weeks ago the price for16 was $1854

 

[Gone]

Who was the supplier?