DeanElectric
1 µW
Hi guys,
I am contemplating on converting my current 36v 20Ah LifePo4 pack to a 72v 10Ah pack, it is constructed of 18650 cells with spot welding. Is there anybody within the UK who would be willing to undertake this work for me? And if so, how much would you charge (haha, pun intended) for it?
I would obviously cover the shipping both ways.
I basically have two options economically viable to me, option 1 is this idea to reconfigure the pack as mentioned, option 2 is to purchase a 'booster pack' to wire in series with the existing pack - but I am unsure as to whether this can be achieved with the BMS being installed on the existing LifePo4 pack???? If I was to run a booster pack, I would probably go for 22.2v Lipo @ 10Ah 25C rate - which is easy to find a charger/balancer/Lv alarm for.
I am looking to go Lipo anyways in the near future, so another option I have is to sell this current LifePo4 pack, and from the proceeds purchased 44.4 v @ 20Ah worth of Lipo, 2 chargers/balancers and Lv alarms. Hmmmmm, decisions, decisions!! Would anyone be interested in purchasing this pack from the UK, it has 2000 miles of normal road-riding on it, and has been drained at a max of 16A (less than 1C) due to the 16A controller that I currently am using.
A bit of reasoning behind my idea: (Basically, I want more speeeeddddd!)
I bought this pack expecting good performance from my current set-up, roughly detailed below:
-Motor - BLDC 9c equivalent, I think it is a 10-turn, performs at around 17mph on the flats
-Controller - 36v 16A controller (cheap chinese with low-current MOSFETS)
I have measured the power-ouput at the wheel on my dynometer, it output 279 watts at 17mph topped-out. The torque is reasonable due to the diameter of the 9c-equivalent motor and 26" wheel, but could do with a little more current hence the need for a higher-spec controller.
-Bike, hardtail, downhill-geometry, I have a raised stem and seatpost for a more 'sit-up and beg' riding profile.
Basically, I weigh 90Kg, the bike weighs ~ 40Kg, and I think it is struggling for top-end in this 36v configuration - especially with the 10-turn motor.
The pack is currently fitted with a BMS rated to (I think) 16A continuous. Obviously the BMS will be changed to suit the new cell-configuration so this would need to be factored into the modification of the pack.
I understand that I will require a new controller to work with the nominal 72v set up, can anyone recommend one easily obtainable in the UK, or with reasonable shipping costs from the good ol' USA?
So, anyone interested in this little project to earn a bit of spondoolers? I will pay a good rate for anyone willing to undertake this project, quote a price and approx turn-around time and I will get back with an answer with 1 day.
Cheers for your time guys!
Dean
I am contemplating on converting my current 36v 20Ah LifePo4 pack to a 72v 10Ah pack, it is constructed of 18650 cells with spot welding. Is there anybody within the UK who would be willing to undertake this work for me? And if so, how much would you charge (haha, pun intended) for it?
I would obviously cover the shipping both ways.
I basically have two options economically viable to me, option 1 is this idea to reconfigure the pack as mentioned, option 2 is to purchase a 'booster pack' to wire in series with the existing pack - but I am unsure as to whether this can be achieved with the BMS being installed on the existing LifePo4 pack???? If I was to run a booster pack, I would probably go for 22.2v Lipo @ 10Ah 25C rate - which is easy to find a charger/balancer/Lv alarm for.
I am looking to go Lipo anyways in the near future, so another option I have is to sell this current LifePo4 pack, and from the proceeds purchased 44.4 v @ 20Ah worth of Lipo, 2 chargers/balancers and Lv alarms. Hmmmmm, decisions, decisions!! Would anyone be interested in purchasing this pack from the UK, it has 2000 miles of normal road-riding on it, and has been drained at a max of 16A (less than 1C) due to the 16A controller that I currently am using.
A bit of reasoning behind my idea: (Basically, I want more speeeeddddd!)
I bought this pack expecting good performance from my current set-up, roughly detailed below:
-Motor - BLDC 9c equivalent, I think it is a 10-turn, performs at around 17mph on the flats
-Controller - 36v 16A controller (cheap chinese with low-current MOSFETS)
I have measured the power-ouput at the wheel on my dynometer, it output 279 watts at 17mph topped-out. The torque is reasonable due to the diameter of the 9c-equivalent motor and 26" wheel, but could do with a little more current hence the need for a higher-spec controller.
-Bike, hardtail, downhill-geometry, I have a raised stem and seatpost for a more 'sit-up and beg' riding profile.
Basically, I weigh 90Kg, the bike weighs ~ 40Kg, and I think it is struggling for top-end in this 36v configuration - especially with the 10-turn motor.
The pack is currently fitted with a BMS rated to (I think) 16A continuous. Obviously the BMS will be changed to suit the new cell-configuration so this would need to be factored into the modification of the pack.
I understand that I will require a new controller to work with the nominal 72v set up, can anyone recommend one easily obtainable in the UK, or with reasonable shipping costs from the good ol' USA?
So, anyone interested in this little project to earn a bit of spondoolers? I will pay a good rate for anyone willing to undertake this project, quote a price and approx turn-around time and I will get back with an answer with 1 day.
Cheers for your time guys!
Dean
