jose_p_adams
1 µW
- Joined
- Mar 20, 2021
- Messages
- 2
Hello everyone. This is my first post but I have been doing quite a bit of reading. I recently came into possession of a 1976 Batavus HS50 moped. The original 2 stroke gasoline engine was completely destroyed by previous owners and it is time to move on to an electric conversion. I have been doing some research on electric motors and batteries and the like and I have a few questions. There is a link below so you can more easily see what it looks like.
https://www.google.com/search?q=bat...AgXEAE&biw=1964&bih=1201#imgrc=lK4o5zUAxLRM_M
It was originally powered by a 50cc, 2-stroke engine which by all accounts I have read was underpowered for what it was. I am looking to keep the styling of the bike as close as possible to the original. I also want to keep the pedals. I will have to remove the existing gas tank and replace it with a battery/motor controller compartment which will be custom fabricated and will hopefully kinda look like the gas tank.
I'd like it to carry me up hill at 20-25 mph for a short distance and also be able to top 30 mph on flat ground. These numbers are pretty consistent with the performance that I believe that the bike was originally designed for. It has mechanical drum brakes and skinny tires so I don't want to get too crazy.
It seems to me that a 1500w motor will be a reasonable replacement for the original engine. I plan to mount the motor in the same configuration as the original engine. The original engine had a centrifugal clutch which drove a 60mm type A belt pulley. That belt was also connected to a larger idler pulley/13 tooth chain sprocket combination. That combination pulley/sprocket then drove the rear wheel with a 50 tooth sprocket. Overall, I think that the gearing reduction was between 13:1 and 14:1. There is obviously some flexibility with this in the final design and that will depend on the RPM range of the motor that I end up purchasing. It can also be modified in the future, if needed by purchasing a different pulley. I have been looking for a motor for some time and I think that the best option I have found is the Golden Motor 1500w
https://goldenmotor.bike/product/1500w-bldc-motor/
The dimensions seem to fit in the space I need and the output shaft is a keyed round shaft that I can fit the appropriate pulley to. I have looked at the QS motors but have found only 2000w motors which is probably reasonable but the physical size of them seems close enough to being too big that I am hesitant to try it.
Is this reasonable? Is a 1500w motor adequate to power a 120lb moped with a 200lb rider?
For a controller, I was planning to just get the 2000w controller that is rated for 48v and 50A.
https://goldenmotor.bike/product/bldc-motor-controller-48v2000w/
It is not clear based on the website what all is included but I guess once I find out, I can get the rest of the stuff I need to make it work. I do hope to re-use the brake levers currently on the moped. They have switches for the brake light which I believe can be integrated into a regen controller circuit. The golden controller also seems to have good dimensions to integrate into my battery/controller enclosure plans.
Finally, I will need a battery. I plan to construct my own battery pack. Due to the space available, the battery pack will need to be either 2 separate units which will be located on either side of the top tube. This will allow it to look more like a gas tank and will free up some space. I have never constructed a battery pack. I am not sure if I want to make this 2 separate packs, or a single pack. I am leaning toward 2 separate packs as that will allow use of 2 chargers which may be convenient. I am planning to use Samsung 30Q 18650 cells in either a 6p13s or 8p13s configuration. These cells seem to be a good option for this application and are supposedly rated at 15amp continuous discharge. I need to do the design work but I am going to go with the 8p configuration if I can fit it, and I think that I can. At max power, I would be relying on these cells for about 4A each. Am I on the right track here? Is an 8p13s battery pack constructed with Samsung 30Q cells adequate for a 1500W motor? I would like to have 20 miles of range at a minimum. My calculations suggest that the 8p battery will be adequate to do that but I have no experience.
Any input is much appreciated.
TLDR: I have a 120lb moped and I need to make it go the way it used to go. What size battery? What size motor? What controller?
https://www.google.com/search?q=bat...AgXEAE&biw=1964&bih=1201#imgrc=lK4o5zUAxLRM_M
It was originally powered by a 50cc, 2-stroke engine which by all accounts I have read was underpowered for what it was. I am looking to keep the styling of the bike as close as possible to the original. I also want to keep the pedals. I will have to remove the existing gas tank and replace it with a battery/motor controller compartment which will be custom fabricated and will hopefully kinda look like the gas tank.
I'd like it to carry me up hill at 20-25 mph for a short distance and also be able to top 30 mph on flat ground. These numbers are pretty consistent with the performance that I believe that the bike was originally designed for. It has mechanical drum brakes and skinny tires so I don't want to get too crazy.
It seems to me that a 1500w motor will be a reasonable replacement for the original engine. I plan to mount the motor in the same configuration as the original engine. The original engine had a centrifugal clutch which drove a 60mm type A belt pulley. That belt was also connected to a larger idler pulley/13 tooth chain sprocket combination. That combination pulley/sprocket then drove the rear wheel with a 50 tooth sprocket. Overall, I think that the gearing reduction was between 13:1 and 14:1. There is obviously some flexibility with this in the final design and that will depend on the RPM range of the motor that I end up purchasing. It can also be modified in the future, if needed by purchasing a different pulley. I have been looking for a motor for some time and I think that the best option I have found is the Golden Motor 1500w
https://goldenmotor.bike/product/1500w-bldc-motor/
The dimensions seem to fit in the space I need and the output shaft is a keyed round shaft that I can fit the appropriate pulley to. I have looked at the QS motors but have found only 2000w motors which is probably reasonable but the physical size of them seems close enough to being too big that I am hesitant to try it.
Is this reasonable? Is a 1500w motor adequate to power a 120lb moped with a 200lb rider?
For a controller, I was planning to just get the 2000w controller that is rated for 48v and 50A.
https://goldenmotor.bike/product/bldc-motor-controller-48v2000w/
It is not clear based on the website what all is included but I guess once I find out, I can get the rest of the stuff I need to make it work. I do hope to re-use the brake levers currently on the moped. They have switches for the brake light which I believe can be integrated into a regen controller circuit. The golden controller also seems to have good dimensions to integrate into my battery/controller enclosure plans.
Finally, I will need a battery. I plan to construct my own battery pack. Due to the space available, the battery pack will need to be either 2 separate units which will be located on either side of the top tube. This will allow it to look more like a gas tank and will free up some space. I have never constructed a battery pack. I am not sure if I want to make this 2 separate packs, or a single pack. I am leaning toward 2 separate packs as that will allow use of 2 chargers which may be convenient. I am planning to use Samsung 30Q 18650 cells in either a 6p13s or 8p13s configuration. These cells seem to be a good option for this application and are supposedly rated at 15amp continuous discharge. I need to do the design work but I am going to go with the 8p configuration if I can fit it, and I think that I can. At max power, I would be relying on these cells for about 4A each. Am I on the right track here? Is an 8p13s battery pack constructed with Samsung 30Q cells adequate for a 1500W motor? I would like to have 20 miles of range at a minimum. My calculations suggest that the 8p battery will be adequate to do that but I have no experience.
Any input is much appreciated.
TLDR: I have a 120lb moped and I need to make it go the way it used to go. What size battery? What size motor? What controller?