LifePo4 Charge Performance
Thinking seriously about replacing our two GC2's with a pair of 100ah LifePo4's. Hearing a lot of chatter about how lithiums accept a charge much quicker than lead cells. Very familiar with how ou...
Forum Discussion
Note that you do not have to own LFPs and have experience with them to observe that 80/40 = 2
Yes, 40-80s means fewer lifetime cycles than 50-90s but not that many fewer. Just another trade -off. How many times a year will you ever do that as a weekend warrior? Or are you a full-timer off grid?
You still have to recover the batts (AGM or FLA) after some successive incomplete recharges, so for that aspect 40-80s or 50-90s same deal.
You don't have to guess the time it takes to do a 50-90 with an 80 amper on 200AH of FLA or AGM, see my ugly graph posted earlier. EG it takes about two hours with a 70 amper.
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)
There are many trade-offs in each scenario for choosing battery types for an RV set-up, so the more info and points of view we can get the better.
The OP started with an exaggerated idea of how LFPs would save him generator time compared with the set-up he has now. But he also has other very good reasons to be looking at LFPs or perhaps SiO2, so on balance, IMO he is a good candidate for changing his type of battery.
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!
Yes, 40-80s means fewer lifetime cycles than 50-90s but not that many fewer. Just another trade -off. How many times a year will you ever do that as a weekend warrior? Or are you a full-timer off grid?
You still have to recover the batts (AGM or FLA) after some successive incomplete recharges, so for that aspect 40-80s or 50-90s same deal.
You don't have to guess the time it takes to do a 50-90 with an 80 amper on 200AH of FLA or AGM, see my ugly graph posted earlier. EG it takes about two hours with a 70 amper.
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)
There are many trade-offs in each scenario for choosing battery types for an RV set-up, so the more info and points of view we can get the better.
The OP started with an exaggerated idea of how LFPs would save him generator time compared with the set-up he has now. But he also has other very good reasons to be looking at LFPs or perhaps SiO2, so on balance, IMO he is a good candidate for changing his type of battery.
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!
