Hi guys,
I decided to finally get in on the EV game by purchasing a pretty old Oxygen Lepton just for commuting and tooling around my neighborhood. I loved it, but hated the range that four lead-acid batteries in series gave me.
I endeavored to replace the battery pack with 10 Nissan Leaf battery modules setup in series (84v) and replaced the stock controller (made by Lafert) with a Kelly Controller KLS8415H.
The original controller was rated at 60A RMS and 100A peak with a 48v battery pack supplying. The Kelly is rated at 60A continuous and 160A peak with an 84v battery. The performance gain has been absolutely marginal (except for range). I'm not sure there's been in any improvement in top speed or acceleration. Monitoring the controller via bluetooth it looks like I'm getting expected current values when accelerating, but it drops to 30A as I approach 25 mph or so. If the motor is unloaded, it runs up to 45+ mph in a flash.
I am using the stock motor which is a puny little Lafert 1.8kw inrunner with a hall sensor array.
My question is, if I want to improve my hill climbing and ability to get off the line without any shudder, can I squeeze more performance out of the motor with a bigger controller, or am I just running into the limits of the motor's torque curve?
Here's a photo of motor nameplate.
And an album of the build progress
I decided to finally get in on the EV game by purchasing a pretty old Oxygen Lepton just for commuting and tooling around my neighborhood. I loved it, but hated the range that four lead-acid batteries in series gave me.
I endeavored to replace the battery pack with 10 Nissan Leaf battery modules setup in series (84v) and replaced the stock controller (made by Lafert) with a Kelly Controller KLS8415H.
The original controller was rated at 60A RMS and 100A peak with a 48v battery pack supplying. The Kelly is rated at 60A continuous and 160A peak with an 84v battery. The performance gain has been absolutely marginal (except for range). I'm not sure there's been in any improvement in top speed or acceleration. Monitoring the controller via bluetooth it looks like I'm getting expected current values when accelerating, but it drops to 30A as I approach 25 mph or so. If the motor is unloaded, it runs up to 45+ mph in a flash.
I am using the stock motor which is a puny little Lafert 1.8kw inrunner with a hall sensor array.
My question is, if I want to improve my hill climbing and ability to get off the line without any shudder, can I squeeze more performance out of the motor with a bigger controller, or am I just running into the limits of the motor's torque curve?
Here's a photo of motor nameplate.
And an album of the build progress