Help with Govecs Go S3.4

[dnahor]

Can anyone recommend a replacement battery? I live in Atlanta, don’t know much about repairs and sure could use advice. Thanks, David

 

[AngryBob]

Hey, dave. Your battery is 72V, 4.6KWH, and German made, this is information you should have supplied. Did not find any pictures of the battery or its shape or connector type, which is again information you should have supplied.

My crystal ball is in the shop this week, so all I can offer is an opinion that it is proprietary and you will likely have to build your own, or buy one from the seller, and as you did not make yourself fully aware of the product you were purchasing, you are very likely heavily attached with a helicaly oriented inclined plane.

That means you are screwed.

 

[mark5]

Some pix/info on battery:

https://moto-station.com/scooter-station/essai/scooters-electriques-govecs-go-s1-4-go-s2-4-et-go-s3-4-2014[/url]"]
Batteries
Assembled in Taiwan, the Lithium Polymer battery of the GO! S2.4 (+) and GO! S3.4 weighs 32 kg. That of GO! Removable S1.4 weighs only 17 kg. In the pack, there are no less than 440 Samsung / Panasonic cells, arranged in several layers. The structure of the battery is the subject of a patent filed by Govecs. The cooling of the cells is ensured by an adequate arrangement of the latter. In addition, the pack would be particularly airtight and therefore protected from humidity or dust. It would accept micro-charges (no memory effect) and its lifespan is given for 1000 recharging cycles, ie 50,000 km minimum, indicates the manufacturer. A warranty extension is possible on the battery, after the 2 years manufacturer's warranty linked to the vehicle. It is billed 100 € the 3rd year, 150 € for the 4th (prices excluding VAT). To make this accessory last, Govecs indicates that it must be fully recharged at least once a month.

https://docplayer.net/48082094-Govecs-company-presentation.html

https://www.mensup.fr/photo/a,5380,essai-govecs-go-s34,14.html
https://www.autonews.fr/essais-motos/essai-govecs-go-s34-51154

 

[warmsound13]

Thank you for the data on the battery. I just acquired one of the 2014 models of the Govecs 3.4 scooter. However the battery is dead and I haven't been able to charge it or wake it up. Has anyone been able to disassemble this battery? I took it out of the scooter and it is built like a brick. I tried another pair of 36 volt batteries in a series connection and the scooter turns on and runs. Does anyone know the nominal wattage of the motor on this scooter for the 2014 model?

 

[amberwolf]

What's the controller's current limit, and the system voltage? That gives you the wattage it is capable of, which should match that of the motor, for a system that was designed to work as a unit.

 

[warmsound13]

What's the controller's current limit, and the system voltage? That gives you the wattage it is capable of, which should match that of the motor, for a system that was designed to work as a unit.

Thanks for the reply. The nominal system voltage is 72 volts for the battery on this scooter. I'm not sure of the controller current limit. However there is a 70 amp fuse for the lead coming from the battery. I don't think the controller current limit would be above the limit of this fuse. Likely it would be lower for a safety factor. Going with 72 volts x 70 amps would be 5040 watts. If I do the same calculation with 84 volts when the battery is at full charge the wattage is 5880. So I'm figuring the maximum wattage is in the 5000 range. Would the controller limit be on a label on the controller?

I finally was able with some help, and some prying and pounding, able to disassemble the battery case.

 

[amberwolf]

The controller should have a label on it that gives it's ratings, or a model / brand that can be traced to specs somewhere.

Alternately, you may find ads for the scooter model itself that provide "ratings", or info from manufacturer pages (current or archive.org)

 

[warmsound13]

The controller should have a label on it that gives it's ratings, or a model / brand that can be traced to specs somewhere.

Alternately, you may find ads for the scooter model itself that provide "ratings", or info from manufacturer pages (current or archive.org)

Thanks for the info. I looked on the top of the controller but I did not see a label. However I did a google search and found a listing on the bikez.com web site for a 2012 Govecs S 3.4 scooter. Most likely the 2014 model I have is the same rating. The rating listed for the motor is 4.5 horsepower or 3.4 kW. I should have guessed it with 3.4 in the name.

 

[warmsound13]

Thanks for the info. I looked on the top of the controller but I did not see a label. However I did a google search and found a listing on the bikez.com web site for a 2012 Govecs S 3.4 scooter. Most likely the 2014 model I have is the same rating. The rating listed for the motor is 4.5 horsepower or 3.4 kW. I should have guessed it with 3.4 in the name.

I found out the controller is a Sevcon 4th generation size 4 model. It has many ways that it can be configured.
I bypassed the battery BMS to get the battery to charge and to drive the scooter. I am using a generic external 84 volt charger at 3 amps. Seems to be working fine. My batteries are pretty close together in voltage when I am done charging. The battery is assembled by Go-Tech Energy from Taiwan but I have not heard back from them after asking about getting a replacement BMS for the Govecs battery. Does anyone know how many amps the scooter is pulling when you get the high current warning light on the speedometer?

 

[dnahor]

Can anyone recommend how/where to get battery repair / replacement in Atlanta? If my post should be placed elsewhere please direct me. Looking for someone or somewhere who can help, paid of course. Thanks.

 

[warmsound13]

Can anyone recommend how/where to get battery repair / replacement in Atlanta? If my post should be placed elsewhere please direct me. Looking for someone or somewhere who can help, paid of course. Thanks.

I don't have a recommendation for Atlanta. I'm in Austin, TX. I retrofitted my Govecs S 3.4 with other battery packs. I series connected a couple of 36 volt batteries to get up to 72 volts nominal. I also took apart the original Go-tech Energy battery and bypassed the BMS inside of it to get it to where I could charge and use it to power the scooter. If you can find another 72 volt battery with similar specs to the original battery and mount it in the frame that could work. However I am not using the built in charger. I'm using an outboard charger of 84 volts to charge my battery packs.