matt912836
100 W
Currently I have my eZip running overvolted with a 42v 8ah battery (2 42v 4ah lico's in parallel). The motor never struggled with the higher voltage and speed even at full throttle. It definitely got hot but not hot enough to not keep your hand on it. I think this is due to the fact that I only run thin 14 gauge wires from the batteries to the controller so the voltage increase is definitely there and noticeable but the thin wires help from pulling too many amps at once and cooking the motor. I'm assuming its the wires that are bottlenecking the controller which is basically a crude way to limit amps. The battery wire never gets too hot either so its not like its pulling high amps through thin wire. Right now this setup is on a 24v brushed controller with no HVC and 50v caps. I get a decent range, 10-15 miles depending how hard i run it. I want to up my speed more without more amps or overheating.
Recently I've had an idea in mind after coming across this thread finding out that it is possible to run 120vAC power supplies directly on high voltage DC perfectly fine to use them as sort of "high voltage dc-dc converters". I needed a way to get a high amperage 12v output directly from my battery pack of higher voltage to feed an audio amplifier. I looked into voltage reducers, buck converters, inverters, but anything with an output above 10-15 amps gets expensive quick. Once i saw most laptop power supplies and such can be plugged into DC, i rewired my pack in series for 84v 4ah and started testing supplies. I found basically all of them worked fine off DC, only difference between supplies was the voltage it cut off at. Some ran off a single 36v battery fine while some needed 90 or more. I quickly searched for 12v psus and ran into the Dell DA-2. 12v 18ah output for about 220watts. It wouldnt run off 84v, so i added another 42v in series for 126v. The power supply ran fine over 119v, but shut down completely once the battery went below that. If i add another 40v battery in series this will equal 160v fully charged and be perfect for the 118-120v LVC when all the batteries are fully dead (3.0v/cell).
What I want to do now is replace my 24v 500w DC motor controller for one of these: http://www.ebay.com/itm/HX-PWM-AC110V-Input-DC0-110V-Output-4A-500W-DC-Motor-Speed-Controller-Driver-/191171913543?pt=LH_DefaultDomain_0&hash=item2c82bbe747
Then run it off my high voltage battery directly just like the power supply. This is the equivalent to an ebike controller (a PWM speed controller) but runs off high voltage correct? The only difference clearly is it only puts out 4 amps of current, but at upto the voltage your putting in. My question is what would the performance be like with only 4 amps but 110v? Its still only about 300-500w so the motor shouldnt heat up any more than before. My question is will the high voltage make up for the low amperage in things like climbing hills or getting up to speed? I know torque comes from amps but i also know high rpms with low gearing can also make up for torque. I already geared my eZip down from a 20t to a 22t freewheel which made the 42v speed drop from 28mph to about 24mph so that may help slightly. How would a high voltage low amp setup feel? Watts are watts correct? So shouldnt it just feel a little more sluggish up hills requiring a little more pedaling but have a way higher max speed? Will this setup even work correctly? I would definitely monitor battery voltage manually instead of depending on any lvc in the system since i dont know if that controller stops at 120v like the Dell DA-2 or runs lower. Thoughts?
Recently I've had an idea in mind after coming across this thread finding out that it is possible to run 120vAC power supplies directly on high voltage DC perfectly fine to use them as sort of "high voltage dc-dc converters". I needed a way to get a high amperage 12v output directly from my battery pack of higher voltage to feed an audio amplifier. I looked into voltage reducers, buck converters, inverters, but anything with an output above 10-15 amps gets expensive quick. Once i saw most laptop power supplies and such can be plugged into DC, i rewired my pack in series for 84v 4ah and started testing supplies. I found basically all of them worked fine off DC, only difference between supplies was the voltage it cut off at. Some ran off a single 36v battery fine while some needed 90 or more. I quickly searched for 12v psus and ran into the Dell DA-2. 12v 18ah output for about 220watts. It wouldnt run off 84v, so i added another 42v in series for 126v. The power supply ran fine over 119v, but shut down completely once the battery went below that. If i add another 40v battery in series this will equal 160v fully charged and be perfect for the 118-120v LVC when all the batteries are fully dead (3.0v/cell).
What I want to do now is replace my 24v 500w DC motor controller for one of these: http://www.ebay.com/itm/HX-PWM-AC110V-Input-DC0-110V-Output-4A-500W-DC-Motor-Speed-Controller-Driver-/191171913543?pt=LH_DefaultDomain_0&hash=item2c82bbe747
Then run it off my high voltage battery directly just like the power supply. This is the equivalent to an ebike controller (a PWM speed controller) but runs off high voltage correct? The only difference clearly is it only puts out 4 amps of current, but at upto the voltage your putting in. My question is what would the performance be like with only 4 amps but 110v? Its still only about 300-500w so the motor shouldnt heat up any more than before. My question is will the high voltage make up for the low amperage in things like climbing hills or getting up to speed? I know torque comes from amps but i also know high rpms with low gearing can also make up for torque. I already geared my eZip down from a 20t to a 22t freewheel which made the 42v speed drop from 28mph to about 24mph so that may help slightly. How would a high voltage low amp setup feel? Watts are watts correct? So shouldnt it just feel a little more sluggish up hills requiring a little more pedaling but have a way higher max speed? Will this setup even work correctly? I would definitely monitor battery voltage manually instead of depending on any lvc in the system since i dont know if that controller stops at 120v like the Dell DA-2 or runs lower. Thoughts?