Hi Jeremy! Hope you can help with this one... We changed out the batteries on my son's EZIP 900. It was dead for about a year, but once the relays kicked back in, it charged up fine. He has complained about it being slow. It does seem to be somewhat slower than we remember it. I checked the voltage across the batteries and I am showing a bit over 26 volts. At full throttle and a full charge, I am only pulling about 3.5 amps. That is only 91 watts! Shouldn't it be pulling closer to 35 amps? Thanks in advance -sam
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Low power on Ezip 900
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Posted 10 months ago # : | | -
Sam,
Where are you measuring the amp draw from the motor? How did you get 3.5 amps? If this was truly the draw from the motor, it would be MUCH SLOWER (not "somewhat slower"). I'm not even sure if the scooter would move at 3.5A. The new controllers are 25A maximimum (some older one's are 35A), but either type will probably pull around 15A on average. The only time they'll pull over 20A is if it's an extremely large rider, you're pulling extra weight, or you're traveling up a steep hill. Otherwise, they will rarely get close to the max rating...
If you have fresh batteries and the scooter is working, it's very unlikely you have a controller problem. When the controllers are faulty -- they usually quit working altogether. It's possible to motor isn't peforming as well, but these motors usually hold up for a very long time.
How much bigger is your son since he rode it last year? If he's grown and gained some weight, this could easily cause the scooter to feel slower...eCo Wheelz - Electric Bikes & Scooters
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Posted 10 months ago # : | | -
Thanks Jeremy for the reply. I measured the current by putting my DVM in series with the battery pack, so the reading was at the battery. If 3.5A is not enough to move things, then perhaps I have an issue with my higher amperage setting on my DVM. I am typically measuring in the mA range with it... not A.
Glad to hear that you don't think that it is a controller issue. That will hopefully be one thing we can eliminate as a problem. Please note that his old battery pack apparently got quite toasty. Some of the plastic connectors were sorta melted. The fuse holder was quite mangled.
I would think it would cause some damage, but let me ask you this.... What would be the effect of running the motor straight on, without the controller? Heat? Burn up the motor? Nuclear meltdown? I am sure it would pull a load of current, just not sure what else would happen.
On another note, I saw a YouTube video of a fellow putting some kind of additional battery pack in series with his batteries on his pocket bike. I take it that he was gaining an increase in performance by doing this. Are you familiar with this? If so, what are your thoughts?
Thanks again!
-sam
Posted 10 months ago # : | | -
It's definitely not a controller issue...
If you bypass the controller and send power directly to the motor, it will simply turn the motor non-stop. The point of the "controller" is to control the scooter. It accepts signals from the throttle and controls output to the motor.
As mentioned, a simple explanation for the descreased performance could be that your son is larger since last year. It could also be the batteries. Where did you purchase them? Were they new or used? Even if they were new, they might be slightly lower-quality. Either way, batteries don't always perform exactly the same...
If you wire another battery in "series" it will increase the voltage of the scooter. An additional 12V battery will increase the scooter from 24V to 36V. In concept, this will make the scooter faster. But I'm not 100% sure if the controller can handle the voltage increase. It definitely couldn't handle a larger increase to 48V.
Posted 10 months ago # : | |
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