i want to make a 7s14p /… 29,4v/37,5A aacu pack for my scooter, which pull 16A .
i have a few questions to make sure i make the right one.
what i now have my old pack 22x Nimh cell.
i already orderd the bms 7s 30A
i want to make the pack with the 25r samsung 18650 batteries because they can draw 15A, but i thougt later when they are 14p then the motor only pulls around 1A per cell is that correct ?
the battery charger gives 8A that would not be a problem ? i did the calculation from this site 7s14p-- 14 x (2500/3000) = 11,66 A can someone say that’s right
sorry for the silly questions, i will make the pack with the kweld spot welder…
The current drawn is determined by the load. No matter what battery, the motor and esc will try to draw all it needs. if you have 14p based on a cell that can do 15A you have max. cont. draw of a butload(15x14). So you’re fine there.
You’ll probably need to wire the BMS as bypass tho. Charger should be fine aslong as its made for 7s Li-on. You can not use the charger for your Nimh cells to your Li-on pack (unless specified). The distributor of the BMS probably have an appriopriate charger.
it is actuallie for a onderwaterscooter , so for the original nimh pack i can only do one hour , so with this pack i will do almost 3 hour on full power.
the battery will do actuallie 20A max per cell,
is it correct that when the motor pulls 16 A from the pack from each battery it will only pull around 1A ?
so i can actuallie do a cell that can do less discharge current, its a bit over rated or do you think it will be beter for the batteriy to have a higher discharge current, maybe a longer life for the cell ?
Most Nimh charger iv come acros are not suitable for lithium ion because thay are normally a cv You need a constant current constant voltage charger for lith ion
Cell wise thay would work fine but your could get larger capacity ones, with longer life span, that are cheaper.
Not quite 25r are 2500mA Ish (from memory) that’s 2.5A*14P=35A you can’t take 35amp decided by max load because you need to consider duty cycle and rpm. As a very rough idea I’d guess it last more 6hour ish
i know to get a new charger i was looking for somthing like this
the weight is not a issue, because i need to make the total pack around 6 kg , the same as the nimh pack, this is because else my underwater scooter will only float
Do you have a picture for this spectacular invention?
That charger looks alright. Those cheap chargers on ali/ebay are abit of a gamble tho. Some last forever, some seem to just die or not charge properly. Some are super noisy on the fan.
Might be worth to check different suppliers if you want something that lasts
While that is a very nice charger, it’s not the correct one. You need atleast 29.4V on output.
The one you linked only goes up to 24. You’ll need the HLG-600H-30 or HLG-600H-36 (check table in datasheet)
