The reply below is to a PM sent to me for technical info, not a private conversation, so I am replying in this thread so people asking in the future will be able to see the information. (It's always a much much better idea to ask publicly for that reason--otherwise time is used up for just one person that could have been used to help lots of people who are searching for such information.
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ftanka0 said:
hello, so i purchased the evg global. Now im contemplating, do you think i can cruise at 20mph with the original 36v motor? I was planning on replacing everything with a 48v kit but if i can cruise at 20mph with long range and save a few bucks i would prefer that instead.
It takes about 400-500W to maintain 20MPH on level smooth roads, depending on your aero and rolling resistance, in my experience. As long as the controller and motor and batteries can all continuously output that much power, and the voltage stays high enough for the motor's windings vs wheel size (and the bike's gearing for those that have the motor go thru the gears) to maintain that speed, then it will work.
As long as the original stuff was designed to run at that speed at that voltage, and handle that power output, then unless you have hills or headwinds increasing the power requirements, I don't see why not. Might need better batteries than what comes with it, as those small SLA tend to sag a lot under load, which greatly reduces your top speed. If you need long range (to me long range is at least 50-100miles) as well, you'll need to replace the SLA with a much larger pack of some type of Lithium cells, which probably won't all fit inside the original battery housing.
I get up to about 50 miles using 30Ah of 14s Lithium (10Ah RC LiCo (LiPo) and 20Ah EIG Li-NMC, charged to max of 58.2V, 4.15V/cell, almost 100% charge for the NMC but only 90-something % for the RC LiPo, and discharged to min of 49V, 3.5V/cell, about 90% DoD for the NMC and probably close to 99% for the RC LiPo, but I have not ever run it down that far yet, and don't plan to; that's just my absolute cutoff). Typically on long trips I get 22-26Wh/mile, depending on conditions and load and if I have the trailer or not, with either CrazyBIke2 or Delta Tripper.
But it weighs quite a bit, and I don't carry it all unless I am on a long trip, such as my recent dayjob has required--up to 35 miles round trip, occasionally a bit more, with no chance to recharge the traction packs until I'm home, and sometimes into strong headwinds for much of the trip, which effectively adds at least several miles to the trip as far as power usage is concerned. It fits into two ammo cans, one a larger 50 cal can, and the other a 7.62mm can, common sizes you can find at salvage places, military surplus stores, and thrift stores / yard sales / craigslist / freecycle.
But they won't conveniently fit on a bike frame anywhere--you'd have to build a mount for htem. On the front fork either at the front axle or above the front wheel would work, as well as panniers at the rear axle (don't put them up on a rear or front rack out over the axle, the bike will not handle nearly as well and the rack may break on bumps/potholes).
However, I don't know enough about EVGs specifically to say. Someone else that does know would have to chime in, if you can't find the information in any of the other threads about this kind of bike. Everything I know about them I read in those threads here on ES, for the most part, other than the very little I gathered from some bits of used electronics and handlebar controls I have here.
Oh well the OP is on his own now. No one on this forums gets paid for the info submitted and I was trying to aid him in his project. I have taken alot from this forum (thanks snellemin, sacman, lyen,wesnewell and doctorbass) and was trying to give back. However, due to his immature attitude, I decide he needs a lesson in patience and gratitude. 
I will monitor this post to see who else he will offend. Not many on here have EVG bikes so I could have been a hugh asset to him. Too bad he gave me attitude.
