Your Range with 24V 20AH system
 

Hello,

I noted many people in this forum purchased 20AH cells from Elitepowersolutoins. Just wondering what kind of range most people are getting from a charge. 24V 20AH system will give the best comparison.

Ben

I have the thundersky batteries. A guy on here with the Thundersky's said he was getting 3 miles per 1AH I think which means he probably could go 45 miles or more probably on a 20AH pack. I think that's what he said. I know he did a 30 mile run pretty easily. It depends on what kind of motor and controller you have. If I hit full throttle on mine, I get only about 1.6 miles per 1 AH. If I go half throttle, I can get 2 miles per 1AH and I have a very powerful setup that draws a lot of current so yeah, the 3 mile per 1AH is probably accurate with an average motor that isn't too energy consuming. So if you use 75 % of the battery (15 AH), then you could get 45 miles on one of those nine continent motors with a 20 amp controller. Going at probably 15 - 20 mph the whole way. Once you take it up to 30 mph, you get a lot worse range because of the wind.

if you used the entire battery or close to it without harming it, you could probably go 19AH x 3 = 57 miles as long as there weren't a lot of hills. Hills will also drain the battery more.

The most I've done on my 36v20AH thundersky was a 19 mile run but I only used 50 % of the battery to do it.

I have done several rides using a 24 volt 500 watt cyclone motor with a 30 amp battery. I believe using 36 volts you may get more than 1 mile per amp however with a 24 volt system 1 mile per amp is good. It is difficult to compare because some don't peddle. others use their electric system to varying degrees. I just did a 30 mile ride only slightly using the electric for the first 10 miles. The next 20 miles were almost completely electric assist. At the end of the 30 miles my battery was still felt fresh. If I had not peddled at all the 30 miles on the 24 volt 30 amp battery would have completely drained it.

It just depends on how much you peddle and the conditions of the road bike and weather.

Morp and I discussed this in another thread, I copied this from there.

So I'm running 0.4-0.5 ah per mile at 36v pack. I have an amped rear kit which only draws 15 amps max at 20 mph

I built a 24V 20AH pack with Thundersky cells this spring. I haven't had an opportunity to take a long trip yet but I've done a lot of 20 mile trips and still had plenty of power (my logs from the CellLog 8 have shown over 26V remaining after those 20 mile trips). I'm planning on going to a town that's farther from me once our weather improves--that trip will be a little over 40 miles. I don't think I'll run out of battery power--I'll have my Thundersky pack and my original SLA on the rear rack. I'm so happy with my Thundersky pack that I'm planning building a second pack this summer. It makes a huge difference to go from 10AH to 20AH.

When you say "range from a charge' it is very difficult to say. I have run 360w Cyclone kits and EZip 450w bikes with the Thunder Sky packs. I think it is better to talk about miles per ah rather then total range per charge because we all have our opinion what is a charge. Some max their charge and get a little more from the top charge then others. And some people will run their packs to 80, 90 even 95 of capasity. Personally I currently only charge my packs (2 24v 20ah TS) to about 28.4v so they are not at max charge when I start my rides. I am betting there are a lot of us doing the exact same thing because we are not using a "true" BMS to maximize each cells charge. the same goes for the discharge. I had a CA meter on my Cyclone so I knew my ah discharge but I don't have that on my EZip yet.

Bottom line both my son-in-law and I run between 2 to 3 miles (.33 to .5 ah per mile) per AH used. This will very depending on hills, speed and amount of peddling. I have very bad knees (over due for replacement on both) so I tend to limit my rides to 20 to 25 miles and the last 5 miles I am generally on motor only vand the pack is still going strong. So as you can see it just depends on how you use them.

I thank the list for the quality replies. I have a 450v ezip system converted to another bike. I do have a BMS and was planning to take it down to app 10% SOC. Like nwmtnbkr, I have gone 20 miles with 26V still showing on CellLog.

If you can really get 57miles, this opens up quite a bit of possibilities....

What you need to do first is figure the Wh your battery has.

24v x 20ah = 480Wh.

Then figure what sort of riding your want to do.

Low speed with pedaling- 15wh/m
low speed no pedaling- 20wh/w
high speed- 25+ wh/m

Most people without exceptional setups and no pedaling seem to be in the low 20's wh/m

I tested my bike extensively this weekend. Fully charged with BMS balancer, I got 37 miles with no pedaling and avg speed of 12 mph. The controller apparently cutoff and the cells got down to 2.6V.

My system is 20AH cells x 8, and 450W motor/controller from a Currie Tech Ezip bike that was crashed. I retrofitted the electric components onto another bike.

If I get a better or more efficient motor, say from 9 Continent, I wonder if I can push 40/50 mile range.

Are you a flatlander? I always pedal, but I don't think I'd get 37 miles without pedaling, but then I'm near Glacier National Park and it's mountainous here. I haven't gone more than about 24 miles so far but I've still had plenty of power left in the cells (over 26V). (Plans for a longer trip to a lake tomorrow will have to be postponed since we have a hazardous weather warning that's calling for a storm system to move in with high winds, hail and heavy rain.)

I don't think you'd see a 40-50 mile range on one battery pack by changing motors and controllers, even though the Currie controller can demand 35 amps (that's why it's got such great torque for someone like me who lives in the mountains). Add a second pack, and then your range will clearly exceed the 40-50 mile range you want.

NB is right. If your looking for more distance and willing to pay for it then just add a pack. Of course an additional pack will add weight but it's only 15lbs. The money spent on a new motor and controller plus fitting it to the bike will cost more then a second pack. Beside, the Currie motor setup while a bit on the noisy side is a simple, inexpensive and well proven drive system.

That's really surprising, I have the cyclone 500W with a 24V 20A Ping battery and even with the huge hill at the beginning of my ride I still get around 22 miles. When I don't have to go that way I get over 30.