24V LTO Batteries added to Battery Hookup

[Will Prowse]

You can find them by clicking here
Use the discount code 'SOLAR' to save 10% at checkout bringing the price down from $125 each to $112.50 each

I will have 2x packs in about a week or so. And I bought my own LTO bms that is still in the mail. Time to experiment :D

 

[April]

I dont think that Daly BMS will have any low temp cutoff , $20 says it doesnt.

 

[Will Prowse]

Doesn't need it. Lto charges safely down to -30 degrees Celsius

 

[Craig]

I am a huge proponent of LTO batteries because of their -30C capabilities and their fast charge rate. However I'm am not a fan of 10s configuration simply because it does not produce enough volts wher the majority of the energy is output. So if you are going to buy these I recommend planning on breaking these things apart and going 12s for 24 volts.

069CGA2064061J93T0003572

Volts - AH
2.6 - 0.0931
2.5 - 1.3818
2.4 - 4.3402
2.3 - 5.4748
2.2 - 7.1848
2.1 - 15.0611
2.0 - 7.9945
1.9 - 1.2032
1.8 - 0.3092
1.7 - 0.1181
1.6 - 0.0851
Total 43.2459


The above for example is the discharge log of a 66160 LTO cell

if you notice the majority of the energy is produced at around 2.1 volts so 10S will only output 21 volts .

my test is drawing a mere 10 amps from the cell if you went to 40 or 50 it would be even lower which most likely will shut down inverter.

for myself Im actually considering a 25s 48V system so that the majority of power is at 52.5 volts and stopping charge at 2.5 volts since not much is yielded above that range.

 

[April]

Craig..Thats interesting . I wonder if you have done the same for an LFP cell and where its main energy point is?
Notice on the chart above thats below the knee? Sorta does not make sense.Should be at 2.4 volts or so.

Will.. I was referring to your recent BMS temp cut off video . Wanna take the bet?

 

[Craig]

Craig..Thats interesting . I wonder if you have done the same for an LFP cell and where its main energy point is?
Notice on the chart above thats below the knee? Sorta does not make sense.Should be at 2.4 volts or so.

Will.. I was refering to your recent BMS temp cut off video . Wanna take the bet?

No I have not but I will when I get a chance if my batteries currently freezing in Idaho don't die all together. I actual have results broken down to the 10mv level. Hope to make it accessible on a website sometime in near future. I planning on testing every cell with different discharge rates and reporting results for all to see.

 

[Will Prowse]

Craig..Thats interesting . I wonder if you have done the same for an LFP cell and where its main energy point is?
Notice on the chart above thats below the knee? Sorta does not make sense.Should be at 2.4 volts or so.

Will.. I was referring to your recent BMS temp cut off video . Wanna take the bet?

Oh sure, LFP needs low temp cut off. but this post is about LTO. Talking about LFP in this thread would be off topic.

And take what bet?

 

[Will Prowse]

I am a huge proponent of LTO batteries because of their -30C capabilities and their fast charge rate. However I'm am not a fan of 10s configuration simply because it does not produce enough volts wher the majority of the energy is output. So if you are going to buy these I recommend planning on breaking these things apart and going 12s for 24 volts.

069CGA2064061J93T0003572

Volts - AH
2.6 - 0.0931
2.5 - 1.3818
2.4 - 4.3402
2.3 - 5.4748
2.2 - 7.1848
2.1 - 15.0611
2.0 - 7.9945
1.9 - 1.2032
1.8 - 0.3092
1.7 - 0.1181
1.6 - 0.0851
Total 43.2459


The above for example is the discharge log of a 66160 LTO cell

if you notice the majority of the energy is produced at around 2.1 volts so 10S will only output 21 volts .

my test is drawing a mere 10 amps from the cell if you went to 40 or 50 it would be even lower which most likely will shut down inverter.

for myself Im actually considering a 25s 48V system so that the majority of power is at 52.5 volts and stopping charge at 2.5 volts since not much is yielded above that range.

Yes indeed, thats why you need to rewire it for a 6s/12s configuration. I will also do a capacity test at 10s just for fun.

I am using a 6s LTO bms for these packs. for 12v application.