I would get at least 8A but 12A would work fine for that config. Do not get a 2.1mm port get something like a XLR, M16, GX16 4-pin or XT60 panel mount, there are many other options out there.
4A charges in 450 minutes aka 7.5 hours.
8A charges in 225 minutes aka 3.75 hours.
12A charges in 150 minutes aka 2.5 hours.
3 hours is the maximum for me personally to charge a board, especially at group rides. With a 12A charger you could stop somewhere for an hour and be 40% charged, that will last you a while at 12s10p.
You can alway grab a lower amp charger to slow charge at home when speed isn’t a concern.
These are only rated to 5A. I have charged them at 6A and they get fairly warm. 8A would be pushing it.
I mean, the less amps you are pushing into your cells, the less wear you will create. At 10p and 2A, you are only pushing .2A to each cell. Thats gonna be great for pack health, but very slow to charge from empty.
Pushing fewer amps than that might give you slight benefits to cell health, but there is gonna be a point of diminishing returns.
My suggestion would be to build it, charge it with what you have, and decide if that is fast enough for you. If not, think about a bigger charger. A 40A charging limit is a lot of room to play with (though keep in mind that the limit of your BMS is almost certainly lower than that).
P.s. oh yeah. Slower charging also means that your BMS will have more time to balance your cells. That might also be good.
Very true. Most smart bms can be set to balance from a set level during charge. So essentially you start balancing right when you start charging. A lot of BMS will only start to balance when cells are above 3.7. I’ve got mine set to balance at 3v.
As far as temps go. Well I can charge at 20a, but in order to stay below 40c, I actually charge at 17amps. That’s for a 12s7p pack of qb26800, which are thermally worse than something like a 30q
So called “stock kaly 8a” brick
It only goes up to 6.3a lol
Idk brother. My assumption is my brand new pack was out of balance
Have not checked again since started using my 6.5a charger But again. I’ve cycled the pack a few times since
Yes battery’s get hot when charging heat is your enemy. The heat is the limiting factor and what degrades you battery when charging if you can keep the heat down you can almost charge as fast as you want .
If you only going to charge super slow then the censer will only be any use if the battery fails but this could well stop a fire in that case
I strongly advise been very carefully with even trying this most chargeres can not be paralleled up because backfeeeding can brake some chargeres and confuse the CC CV logi circuits resulting in to high voltage been fed in to you battery.
I disagree we use CC-CV to charge so the wattage output by the charger is not consistent you need to add time to ramp up to full wattage and them more time to ramp down and balance. This could add 30min to a few days to the charge time depending on many factors this includes the charger heating up/efficiency
