this is why
Hi Folks, This is why Li batteries are not a good fit for me. https://weather.gc.ca/city/pages/sk-32_metric_e.html -40 on Wednesday night.
Forum Discussion
A big thing that has changed the story since last year is that now the LFP blurbs say you can charge them at full amps between freezing and 5C/40F. Before they said you had to use reduced amps till batt temp was above 5C.
(However the LFPs with heaters still have the charger doing heating until the battery is to 5C/40F before it allows charging to commence, so that might have to be changed.)
That is a big deal when you have two hours gen time to restore the AH you need to get through till next gen time.
Winter camping around here typical days are say 7C day and 0C night. The provincial parks say gen time is 9-11am (ignoring the 6-8pm time in the dark) So normally you need full charging amps to get it all done in the two hours.
So that means where before LFPs (at outside ambient temps) would not work for winter camping here even though temps are not below freezing, now they could work under the new charging specs.
That still leaves the other considerations for choosing LFPs such as cost and age of the buyer. ( If you are 80 you don't care about 3000 cycles; outlasting the FLAs you have would be good! :) )
(However the LFPs with heaters still have the charger doing heating until the battery is to 5C/40F before it allows charging to commence, so that might have to be changed.)
That is a big deal when you have two hours gen time to restore the AH you need to get through till next gen time.
Winter camping around here typical days are say 7C day and 0C night. The provincial parks say gen time is 9-11am (ignoring the 6-8pm time in the dark) So normally you need full charging amps to get it all done in the two hours.
So that means where before LFPs (at outside ambient temps) would not work for winter camping here even though temps are not below freezing, now they could work under the new charging specs.
That still leaves the other considerations for choosing LFPs such as cost and age of the buyer. ( If you are 80 you don't care about 3000 cycles; outlasting the FLAs you have would be good! :) )