Search found 15 matches

by themyst
Apr 21 2019 2:07pm
Forum: General Discussion
Topic: charging question re: parallel batteries
Replies: 7
Views: 1043

Re: charging question re: parallel batteries

i would worry more about a potentional inbalance you get from partially charging it constantly. most of the cheap non-programmable BMS dont do any balancing until a cell goes beyond the 4.22V mark. under that you can have increasingly more inbalance that is not remedied until a cell is so unbalance...
by themyst
Apr 09 2019 1:51am
Forum: Stand-up E-scooters and E-skateboards
Topic: I fear no man. But that ...thing. it scares me.( Thunder dual motor).
Replies: 11
Views: 2098

Re: I fear no man. But that ...thing. it scares me.( Thunder dual motor).

You need to change the P7 setting to 5 if you want a "dead" start. On P7-0 yes it can be too much torque and overbearing, but changing it to its weakest setting should make it more palatable for you (and increase your range as well).

(I own a Dualtron Spider).
by themyst
Apr 09 2019 1:50am
Forum: Stand-up E-scooters and E-skateboards
Topic: Can I use my 36v motor with a 48v battery and controller?
Replies: 3
Views: 1376

Re: Can I use my 36v motor with a 48v battery and controller?

Motors are rated for watts, not voltage. With that said, connecting a 13S battery with a controller that requests significantly higher amperage will result in sending significantly higher current to that poor motor which may not be able to handle it. Small increases in net wattage should be fine, bu...
by themyst
Apr 03 2019 12:32pm
Forum: General Discussion
Topic: charging question re: parallel batteries
Replies: 7
Views: 1043

Re: charging question re: parallel batteries

DO NOT connect them at the discharge, and then charge both at the same time. That is not safe. You need to modify the bms charge connections to do that safely. Close enough voltage to connect up once charged seperately, IMO. There will be a surge as the higher pack charges the other, but not that m...
by themyst
Apr 02 2019 8:37pm
Forum: General Discussion
Topic: charging question re: parallel batteries
Replies: 7
Views: 1043

charging question re: parallel batteries

Hi, I have a unique situation when it comes to my parallel setup. I have successfully paralleled two 17.5Ah 60V packs 16S 5P (Sanyo GA and LG MJ1 packs) and range has been dramatically increased (could easily hit 60 miles with a little tact on my Dualtron Spider). My question is that the scooter cam...
by themyst
Mar 02 2019 12:43pm
Forum: General Discussion
Topic: Discharge balancing on Parallel batteries??
Replies: 7
Views: 1127

Re: Discharge balancing on Parallel batteries??

So...to be safe, you'd want to separate the charge ports when discharging, and the discharge ports when charging. But they can be paralleled just fine whenever performing the pack operation the ports are designed for. Thanks for such a detailed response! Much appreciated. The only time I would be e...
by themyst
Mar 01 2019 5:28pm
Forum: General Discussion
Topic: Discharge balancing on Parallel batteries??
Replies: 7
Views: 1127

Re: Discharge balancing on Parallel batteries??

Unless both BMS use only one set of charge/discharge leads you need to charge only with the charge side. Many BMS won't balance or shut off if charged thru the discharge side. I don't see a concern charging both packs with 8amps if parallel. Concern is some BMS don't like much over 5 amps. While ch...
by themyst
Mar 01 2019 4:55pm
Forum: General Discussion
Topic: Discharge balancing on Parallel batteries??
Replies: 7
Views: 1127

Re: Discharge balancing on Parallel batteries??

The simplest way to ask my question is, will I cause any damage if I charge through the scooter's charging port if I have both the internal and external paralleled? Would the internal battery connected to the scooter's charging port also be sending current to the external battery in parallel to keep...
by themyst
Mar 01 2019 4:31pm
Forum: General Discussion
Topic: Discharge balancing on Parallel batteries??
Replies: 7
Views: 1127

Re: Discharge balancing on Parallel batteries??

What you are suggesting should mostly be fine depending on your wiring. I say mostly because I am not sure how you are going to keep you battery balanced at 64v. And, if you are going to give the GA cells 8 amps (not 4a) then you are pushing their standard charging limit. The wiring is key to what ...
by themyst
Mar 01 2019 9:55am
Forum: Stand-up E-scooters and E-skateboards
Topic: Replacing the Dualtron EYE throttle
Replies: 6
Views: 2831

Re: Replacing the Dualtron EYE throttle

The finger trigger is simply a potentiometer, rerouting that to a thumb throttle should be a basic case of soldering lines between the existing dualtron throttle to that thumb as long as you know which goes where. The voltage range should be identical to avoid any rideability issues. You can't get r...
by themyst
Mar 01 2019 9:46am
Forum: General Discussion
Topic: Discharge balancing on Parallel batteries??
Replies: 7
Views: 1127

Discharge balancing on Parallel batteries??

This question doesn't relate to an e-bike, but an electric scooter (Dualtron Spider) Hi, I was reading through the sticky in regards to parallel battery setups, and my plan is to run two 16S5P packs (one pack is LG MJ1 with 10 cycles and is internal to the scooter, and one pack is Sanyo GA cells wit...
by themyst
Dec 03 2018 1:51pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Top Speed on Chinese kickboard?
Replies: 9
Views: 1015

Re: Top Speed on Chinese kickboard?

Yea you can't believe the specs it just doesn't matter Chinese is ALWAYS cheaper and how does that show? In performance. Like they say you can only check so many at a time speed, acceleration, cheap, reliable. If you don't mind me asking on forums behalf what did you pay. $1050, plus about $260 shi...
by themyst
Nov 30 2018 6:02pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Top Speed on Chinese kickboard?
Replies: 9
Views: 1015

Re: Top Speed on Chinese kickboard?

You have to understand that when these manufacturers/sellers advertise the specs of these machines, they are simply telling you what the machine is actually capable of doing. But that would more likely be the case with no one on board, no wind, no terrain etc. But yes I agree with the reason you wo...
by themyst
Nov 30 2018 4:47pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Top Speed on Chinese kickboard?
Replies: 9
Views: 1015

Re: Top Speed on Chinese kickboard?

I forgot to mention, the advertised max speed is 90 KMH according to the seller.
by themyst
Nov 30 2018 4:45pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Top Speed on Chinese kickboard?
Replies: 9
Views: 1015

Top Speed on Chinese kickboard?

Hi, I purchased a 60V 3200W kickboard from Alibaba (Puai T11B) which isn't doing the advertised speeds. Specs are: Dual motor brushless 1600W x2 60V 33.8Ah Li-ion battery 35A controllers x2 88lb net weight On a long flat stretch, the best I could get this to is around 41 MPH (66 KMH). With these spe...