LifePo4 Charge Performance

BFL13 wrote:


You can't use the 80 amper on the single 100AH SiO2, AFAIK. It's specs say 27 amps max. You can't throttle back the amps of the charger. A FLA battery will throttle back the amps it takes in by acceptance rate, but I could not find out anywhere if the SiO2 will do that without any harm.

I did not even dare to use my 55 amp converter on the single, but now with two at 200AH I can. With the single I had to use my Vector portable at its 20 amp setting, and not use its 35 amp setting.

On that, nobody has really answered my point about charging LFP at under 41F where Trillium spec says 15 amps max for the 111AH batt. What happens when you apply your 55 amp converter to that batt at 35F? Will it be damaged? If so, how do you accomplish the recharge with your 55 amper? Do you also need a Vector portable that you can set to 10 amps and not dare to use the 20 amps setting?

I think that would be of interest to any LFP owners. Those who have them might say what they do and how that works. (Once the LFP gets over 41F you can really go after it with the high amps)


The Money factor is hard to evaluate since we don't know what anybody else can afford.

LFPs being the best-buy for number of cycles might make sense if you are 40, but not so much sense of you are 80. Scenario is everything!

see I learned somthing about Sio2, I assumed they would have an aceptance rate that would throttle back to a lower charge intake . that whole be a hard stop on me ever buying them if they won't as I set up everything to take the max it can to charge in the shortest amount of time. if I have to change the charger section to buy a Sio2 anyways, why wouldnt I save some money and get Lfp.


for your charging LFP I would assume at 41 they will take a 1C rate, but I will look into it for you some more. My thinking is the actualy charg rate is 4 to 5C and the 1C is an artificial limit put in place by the BMS to prevent us people from overcharging and making to much heat in them which can distort the plates and wreck the battery. there is a drop off in cold but its not as extream as lead acid and such and I am not sure if it would affect them for 99% of the people with a big bank and lower 45-70 amp chargers. at any rate you are not going to dammage the cell as your BMS will control the charge rate as it is monitoring both the voltage of each cell and the tempature of the pack. this is why if you build one dont get a 20 buck BMS, it will work but will not have cold charging cutoff and such. a good BMS will cost 100-150 cdn but will protect your cells properly.

I think if I was 80 or older then I would be looking at prepackaged li solutions instead of building one. money wise they fall inbetween normal acid batteries and Sio2 for initial cost , but still a better per ah cost. I find the older we get the more power we actualy use ;) I know my dad is starting to ask about solar and good batteries on his diesel pusher after seeing how good my pannels are working. just not sure if they make enough pannels for his power usage haha.

Steve