lithium question

StirCrazy wrote:

S Davis wrote:


EVE LifeP04 cells are 10% to 90% for 3500 cycles, they should still have 80% capacity at that point. If so these should outlast me.

I think your missreading that a bit.. the industry standard is that the cycles they list are based off a 100% usage. they recomend 10-90% use range and that will extend your cycle life possibly up to 5000-7000 cycles, before you reach that 80% threshhold. then that 80% could be maintained for another 10 years or longer, if you treat them good.

Steve

Yep. This is why Hertz rent a car is buying 100,000 base models of an EV that uses LFP batteries. An expected battery lifetime of a million kilometres vice other chemistries. You can pretty much run LFP to zero frequently without as much worry of damage. 10 to 90 is much better though. The sacrifice is they are heavier and performance suffers a bit from the higher end models.

We are kicking around the idea of putting something like a battle born in our new little trailer that comes with 2 x 6 volt AGM’s. The cheap skate in me says live with the AGM’s and wait a few more years and the price delta to come down. Guess we’ll see.

S Davis wrote:


EVE LifeP04 cells are 10% to 90% for 3500 cycles, they should still have 80% capacity at that point. If so these should outlast me.

I think your missreading that a bit.. the industry standard is that the cycles they list are based off a 100% usage. they recomend 10-90% use range and that will extend your cycle life possibly up to 5000-7000 cycles, before you reach that 80% threshhold. then that 80% could be maintained for another 10 years or longer, if you treat them good.

Steve

pianotuna wrote:

time2roll wrote:

pianotuna wrote:
You can. But you won't get the same number of cycles. There are a whole bunch of hoops to jump through if that is the goal.

I am not sure I understand this statement.
Charging to maybe 95% with 13.6 volts should yield more longevity in a lithium battery.

For MAXIMUM cycles charge starting at 40% and stop charging at 90%. How do you manage that with a wfco?

your still trying to apply that old chemisty li limitations to the newer LFP requirments eh. I thought we alread edjmacated you on that. to getmaximum life you can still charge to 100% but dont go below 20% and dont excede 0.25C charge rate, with a proper charger made for LFP, or 1C discharge rate. 0.25 charge rate isnt a big deal as I doubt anyone is going to hit it unless you only have a 100 amp battery in a unit, put 300 to 400amp hours in and I dout you will ever get over 25% . even then the rated 4000 cycles (average) is based off 100% discharge and charge at 1C rates for both... Im good with 4000 cycles min..

S Davis.

Similar question--how do you stop the wfco at 90%?

pianotuna wrote:

time2roll wrote:

pianotuna wrote:
You can. But you won't get the same number of cycles. There are a whole bunch of hoops to jump through if that is the goal.

I am not sure I understand this statement.
Charging to maybe 95% with 13.6 volts should yield more longevity in a lithium battery.

For MAXIMUM cycles charge starting at 40% and stop charging at 90%. How do you manage that with a wfco?

EVE LifeP04 cells are 10% to 90% for 3500 cycles, they should still have 80% capacity at that point. If so these should outlast me.

time2roll wrote:

pianotuna wrote:
You can. But you won't get the same number of cycles. There are a whole bunch of hoops to jump through if that is the goal.

I am not sure I understand this statement.
Charging to maybe 95% with 13.6 volts should yield more longevity in a lithium battery.

For MAXIMUM cycles charge starting at 40% and stop charging at 90%. How do you manage that with a wfco?

bighatnohorse wrote:
Apparently so according to their website: https://wfcoelectronics.com/lithium-solutions/

Thank you!

for me, if I am spending 400 or more on a lithium battery what another 100 to upgrade the charger section of your power center?

I did the same even though Expert Power recommended the Noco genious in a Q&A session...I bought there lifepo4 charger for like $80 and am really happy with it charging at 20 amps instead of the 10 my Noco does..

I was one of the hesitant ones about getting lithium and since I have,I couldn't be happier with charging times and weight..Solar I'm still trying to understand for lithium...

jaycocreek wrote:
I agree Steve except when I got my first Lifepo4 battery I wrote the company and asked which charger will work with your lifepo4..

And this was there answer:

Lynx battery wrote:
Any charger up to 40-50amps that takes either lithium or AGM Batteries.

If you are buying new, go with one with a lithium setting.

But looking at the chart above,Gel is the closest...And I have watched a couple of Will's videos on setting up your solar controller and he mentions for most the lead acid setting will work with lifepo4..Crazy huh...

ya, I have seen a bunch say any will work, but if you dont have Li but do have gell to use that as it is closest. but I think for our purposes with the lower relitive charge amprage we are talking about it wont noticable hurt the battery you might lose a few cycles, but we are talking a few out of 3000 (cant back that up only an asumption as its not getting a perfect charge profile) you may also take longer to charge the batteries but that is just my theory.

for me, if I am spending 400 or more on a lithium battery what another 100 to upgrade the charger section of your power center?

pianotuna wrote:
You can. But you won't get the same number of cycles. There are a whole bunch of hoops to jump through if that is the goal.

I am not sure I understand this statement.
Charging to maybe 95% with 13.6 volts should yield more longevity in a lithium battery.