I can not figure out how to post new topic on this forum, so have piggy backed on this post, sorry. Can any one explain how to post on GEM forum?
I have 2009 exLHD with 7.0 HP motor. It uses 9 x 8 VDC gel batteries. Have not driven in 5 years due to dead batteries. Rather than replace 8 VDC gels would like to go with lithium-ion battery. I found QC Charger GEM KITS in 96 VDC x 3 grades. What are to pros/cons of over amperage on motor and gear box? My GEM gets about 27-28 MPH and 25-30 miles per charge. It would be nice if I could get up to 35 MPH as there are some 35 MPH streets in small town I live in.
Yep - it is hidden.
The easiest method is to just tap your keyboard “c” key(no modifiers). This action will open up the “New Topic” editor window. (think “c” for create). A sample of what your are publishing is in the window to the right.
Depending on what is being viewed at the time, the editor might copy/paste a few things into your editor window along with some HTML markup in the Body.
Clear all that out of you are starting a new topic. Type in a new Topic name. Make it catchy and somewhat descriptive as to what your issue is.
Also- use the pull down window and select which forum you want your new message to end up.
If you want to insert a graphic or picture to help with your description use the Insert Graphic tool in the editor toolbar.
The 96 volt sounded a little risky on voltage increase to motor. I am a mechanical engineer, not electrical engineer. I have however done wire sizing calculations for years for starters and motors. What does lipo, lfp and Sdi 22s mean?
Are there any other additions I will need for wiring, controller or charger for lithium-ion system?
Do I need MM?
LFP is lifepo4 chemistry, often used for low cost batteries. 3.2v per cell
SDI is the newest Samsung Chemistry as used in BMW and other production EVs. 3.65v
Some of us made a bulk purchase of the factory Samsung battery modules in 22s configuration. (22 string) 22 x 3.65 = 80 volts nominal) 91v maximum charge
This seems to be the sweet spot for classic Gems. 100 sold
Over 30 mile range and a nice uptick in performance.
I sell them for $2950 delivered. Complete with active bms and support.
Battery management system. Device tracks cell health to interupt charging and discharging if needed to keep safe.
Any cash payment. Venmo or Zelle.
Can you wait two weeks? Else, I can have one drop shipped from Ca.
The exLHD has a high ratio gear box. it could have a 12.xx ratio and 35 mph might happen. Or the 14.xx ration and 35 no way.The Ge 7hp is a great motor but wont survive if it is spun too fast. Transmission swap is pretty easy, a 12.xx ot 10.xx trans would be better suited for your goal
This is where you decide what role your car needs to play and build it to suit your needs.
Figure out exactly what you have to build from and with a little work/searching you might be able to ferret out parts that will make your car work better towards your goals.
For instance, On top of your gearbox there once was a factory barcod/label/barcode that we might be able to track down what gearset your car is running. That label was usually on the driver side on that side of the motor flange.
Using this info, and measuring the height of your tires we can calculate the RPM of the motor given a desired speed you will be operating your car within.
My bar code number below barcode is S/N 1554485 eL HD 2009 any idea which gear box ratio this is? I have tried larger tires however there were limits on fender clearance and rolling radius could only be increased about 1/2 inch best I recall, it has been several years since tried that. Thanks for your help.