is a 75 x 18650 battery pack enough for a 36V Ev-Global-Motors
- Thread starter Greg555
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indianajo
Well-Known Member
A tenergy 18650 batter spec sheet is here: http://www.all-battery.com/productimages/li-ion/Data sheet 18650 2200mAh.pdf
So nominal voltage of 3.7, a 36 v battery would be 9.6 in series, so 10 in series. I don't know how you divide 45 cells into stacks of 10.
Normal discharge current of one cell would be 1.1 A, I believe they say, so 4 stacks would get you 4.4 A. 4.4 * 36 +158 watts. That is pretty light. You can rapid discharge at 2.2 A but you better not do that very often. That is 316 watt, more than many middrive motors. I searched global bicycle motor and got a lot of for sale links but none titled global brand.
My geared wheel drew 400 W up 15% grades at >10 mph and >700 W below 6 mph. that was at gross weight of about 220 lb. I had a 30 amp rated battery (48 v) of 11 stacks.
What is that plastic thing? My first battery was stacks of cells welded badly, encased in a fiberboard shell then a shrink wrap sleeve.
So nominal voltage of 3.7, a 36 v battery would be 9.6 in series, so 10 in series. I don't know how you divide 45 cells into stacks of 10.
Normal discharge current of one cell would be 1.1 A, I believe they say, so 4 stacks would get you 4.4 A. 4.4 * 36 +158 watts. That is pretty light. You can rapid discharge at 2.2 A but you better not do that very often. That is 316 watt, more than many middrive motors. I searched global bicycle motor and got a lot of for sale links but none titled global brand.
My geared wheel drew 400 W up 15% grades at >10 mph and >700 W below 6 mph. that was at gross weight of about 220 lb. I had a 30 amp rated battery (48 v) of 11 stacks.
What is that plastic thing? My first battery was stacks of cells welded badly, encased in a fiberboard shell then a shrink wrap sleeve.
Greg555
New Member
harryS
Well-Known Member
Your battery can hold 75 cells. These are the maximum combos of cells you can pack into a space of 75.
36V 10Sx7P (70 cells)
48V 13Sx5P (65 cells)
52V 14Sx5P (70 cells)
A 12 S is an odd duck. It would be a 44 volt battery, to be consistent with the above. It will have an operating range of 36V to 50.4V. Most 48V ebike controllers have a low voltage cutoff of 40V, so you won't be able to use the capacity available under 40V. Some controllers can be programmed to lower the cutoff by 1-2 volts. Maybe you have one that's more versatile. Just thought I would mention it.
Can't answer the title question because we don't know what kind of cells you are using. Stuff it with the wrong cells, and it might not be able to run a motor very long at all.
Take the Tenegy cells in Indianajo's link. Sure, they're 2.2AH, but I believe they're for flashlights, as the max current is 1. 1 Amps. Won't run any ebike I own, not even with 70 of them.
36V 10Sx7P (70 cells)
48V 13Sx5P (65 cells)
52V 14Sx5P (70 cells)
A 12 S is an odd duck. It would be a 44 volt battery, to be consistent with the above. It will have an operating range of 36V to 50.4V. Most 48V ebike controllers have a low voltage cutoff of 40V, so you won't be able to use the capacity available under 40V. Some controllers can be programmed to lower the cutoff by 1-2 volts. Maybe you have one that's more versatile. Just thought I would mention it.
Can't answer the title question because we don't know what kind of cells you are using. Stuff it with the wrong cells, and it might not be able to run a motor very long at all.
Take the Tenegy cells in Indianajo's link. Sure, they're 2.2AH, but I believe they're for flashlights, as the max current is 1. 1 Amps. Won't run any ebike I own, not even with 70 of them.
tomjasz
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