what will the difference of 36v vs 48 v mean to me?

[emaayan]

so here the 2 motors i'm testing, the left is MAC, rated 1000 watt, on the right BMC rated 600 watt, but is capable if doing 25% more rpm's then the BMC

ever since the begining, i've always had the impression that i need a 48 volts system to get a bigger kick. but now i'm not so sure, i'm now trying to figure, what exactly is the system most optimized without just wasting heat, with ecospeed's controller and motor i've managed to get usages of 2.6 ah per km (i'm measuring that way cause i wannna calc the range of the battery), using infineon's and mac's i got 1.9 and with bmc i got 1.6 km per amp. but ride times also got to 35 even 31 minutes respectively. but still all of this with 48 volts and 25-30 limit.

but will i feel the difference with a 36 volts system? will it meaning anything, if not can i shift all my focus on 36v battery packs, and focus on amps alone?

 

[wesnewell]

A 48V battery will deliver more wattage to the controller, which in turn should deliver more wattage to the motor. The result will be that that you will have faster acceleration and a faster top speed with the 48V battery than you will have with a 36V battery using the same controller and motor for both. This is assuming that the motor used is capable of utilizing the extra wattage provided by the 48V battery.

 

[emaayan]

ah.. but what is the difference if ill have a 48 volt batt with a 20 amp current or a 36 volt with a 26 amps ? my amp limit will always be around 35 btw...

 

[brumbrum]

ah.. but what is the difference if ill have a 48 volt batt with a 20 amp current or a 36 volt with a 26 amps ? my amp limit will always be around 35 btw...

you will have more speed and less torque

 

[emaayan]

you mean more speed less thrust with 48v on 20 amp, and vice versa with 36v on 26?

even thought they both amount to almost the same wattage..

 

[brumbrum]

yes, you will get less launch and pull from the motor. But to be honest there is not much in it between 20 amps and 26.

The more amps the more immediate acceleration or pull, for instance more amps will get you up a steep hill easier and get you off the lights faster. Those who use large amount of amps i.e 50 on a rear hub motor are likely to be to 'wheelied' and flipped off their bike with full throttle from a stand still.

 

[emaayan]

well my current system i have the limit set up to 26 amps, however at once i pick up speed at lowest gear i reach 15 amps, then gear up, i reach around 19, at 3rd gear i believe i can get the most out of it. without any more speed.

my initial thought that i would start a 48 volt system, a do a ride with amp limit of 20, then, 25, then 30, and see the difference in trip time vs amp consumption, so for example if i'll see that i can get the same trip time in 25 and in 20, then i'll know that the actuall wattage i should have.

then i came to see em3ev's frame http://em3ev.com/store/index.php?route=product/product&product_id=161 mounted packs, which looks cool, BUT can only take 20 amps continuous discharge, which can only happen if i set the max amps to 20 on my controller, but then i asked myself what would be the difference between getting a 48 and 36 v (aside from the AH off course).