spent a little time thinking about how to run a 1c test without equipment. i wanted to see if a battery designed to operate at 1c could be able to maintain a 100%t. i noticed theres people from australia and california, warm climates so i looked up monthly average temperatures.
melbourne seems perfect for ebiking, 9 months of 20C average or better
https://en.wikipedia.org/wiki/Melbourne
im vancouver bc we have 3 months 20C plus and average low of about 10C
https://www.currentresults.com/Weather/Canada/British-Columbia/Places/vancouver-temperatures-by-month-average.php
heres docware
docware » Nov 27 2019 12:06am
To mighty82 : I have checked the chart, seems to be OK, hope you can see the chart now. If not send me PM.
As I mentioned few days ago, another two cells are running the cycling test, Samsung 30Q and LG MJ1. Parameters are the same, charge 1 A, 0,1 A cut-off, discharge 2,5 A, 30Q 4,1 – 3,3 V, MJ1 4,1 – 3,4 V.
Here is brief graphic characterization of both cells at the beginning. It´s interesting to see how MJ1 higher internal resistance affect capacity at 3 A discharge. Thanks to warming of the cell is capacity at 3 A virtually little bit higher, drawing near to 2 A line.
i dont have a 30Q but i have a 17s4p of 25r, should be comparable to a 30q ir
its 50f/10C outside
my bike/battery is inside 75f/23C
set the CA to 10 amps
went for a 10km ride
i spent most of the time using about 650 watts steady and overshot the amps a couple times to 980 watts before the ca restricted it back
the battery temperature after the ride
average speeds
at pretty much 1c steady 680 watts, 10C outside temperature, 30km/h the battery couldnt maintain its 100%t. it fell 8f/4C
this is my version of a real world test at 1c for my climate, ive left the bike outside for 54 minutes to simulate visiting someone for an hour then ill get on the bike and do the same trip to see what happens with the battery temperature.