999zip999
100 TW
No worries I just have a kingpan 300w charger that charges fast enough. But to think of a 37a charger is wild. The wires in my house would melt first.
nebriancent said:im just over 2300 km and 90 or so charge cycles on my pack and i have noticed no real decrease in capacity
i burst at up to 5c and my continuous now is about .75-2c depending on terrain so they do seem to hold up pretty well
i had to replace 2 paralleled strings due to my own mistake of overdoing the c rating in -15c weather and not checking the balance but the rest of the cells are within 20mv after 90 cycles with no balancing
i suggest from my small amount of exp with these cells to check the balance once every 4-5 cycles and if you notice your voltage looking a little low during your run check it then and there
side question to doc
i have done a shunt mod via a voltage divider to the current sensing circuit on a 12 fet infinion running 4110s
im getting peak amperage registered on the ca at 107.8 amp
im not sure what the phaze current multiplication is on these controllers or if its dependent on the motor its feeding
is this sustainable on a 9c 8x8 aka 2808 or am i risking popping my fets? if i need to tone it down it shouldn't be a problem as i have a 22 turn pot on the one side of the vd circuit
1KW said:But how to charge once its all connected,
1KW said:and do YOU have to have balance wire connections with these?
1KW said:Or a simple + and - for charge/discharge?
molybdenum said:Needing a powerful ebike but not finding a suitable battery for a reasonable price, I looked into DIY batteries. Fortunately, Endless-sphere is an incredible repository of information; thus, I embarked on endeavor to build a 17s10p triangle pack for my first ebike build.
I ordered 28 Makita packs from Doctorbass last May; of these, about 200 cells were between 3 and 4.2V; I lost another 8 due to self-discharge but only needed 170 cells to complete my 17s10p triangle battery. I have another 40 odd cells between 2.5 and 3V which I may use down the road as spares and for auxiliary packs for lights etc. The remainder below 2.5V were sent for recycling
Of the 28 Makita packs, three were of the new generation type; these were easy to open even with my primitive tools once I found the deeply recessed security screws in the inner plastic housing (I'm not sure what people were complaining about).
After charging and testing all the cells, I was able to build the pack in a triangular arrangement to fit an EM3EV triangle bag and it just squeezes into the smallish triangle of my Norco Sasquatch. With the weight in the triangle, the cornering is awesome and the bike feels strong and incredibly stable at high speeds.
All in all, I’m very pleased as the 71.5V (hot) 16Ah pack is far more powerful than most commercially available batteries, all for a total cost of $450 including charger, soldering supplies, wire and all shipping. My build flies along at 60+kph on an HS3540 even when approaching lvc. My DIY pack easily handles the 28 km hilly commute to and from work with 30-50% reserve depending on my riding I save about 30-40 minutes a day in commute time compared with the car or regular bike.
After 200 km of riding, my CA reports an overall resistance of about 0.09 ohms (down from 0.15 when I first rode). The pack feels warm but not hot when I arrive and the 17 parallel groups have remained balanced