Nice to have money to spend so frivously.
If I had it to do over I would NOT have ordered 24 - 18 Ah Lishen 2.5V cells that weigh almost 50 pounds. Instead I would have ordered 16 - 25Ah TOPBAND cells from a US manufacturer. They are half the weight and 7 more AH. Good for about 30 miles.
It' s why I am exploring 24V options as since I am stuck with 24 - 2.5V LTO cells that weigh 900 grams each.
900 grams = 1.98416 pounds so 2 pounds easily with connecters. So 10S = 20 pounds and 12S = 24 pounds. 22S = 44 pounds , in boxes 46 pounds.
It is why a daily commuter running 10S OR 12S LTO is non negotiable. I spent lots of $$$ on LTO and for the last three years I only ran them a few times. I need to be able to run them 95% of the time and save my LIFEPO4 for longer trips and higher voltage set ups.
I still have > two weeks to decide on 24V motors. Right now it seems like the 24V Unite motors are my best bet. They should handle 25 amps each for < 30 seconds and 20 amps continuous which should do steady 26 to 27 mph cruising without over heating.
My 1,000W 36V Unite motor with a 26 or 28 amp controller runs like a top and gets barley warm even at full throttle. Two 24V motors should handle 25 amps each with no worries. The 36V motor does about 27 or 28 mph on the flat. Two 24V motors geared for 30 mph should out accelerate a single 36V 1,000W motor.
You want a chain drive. OK. But there’s no good argument for using two motors in this application, brushed or otherwise - it’s unnecessary complexity. XYD make larger motors. Have a look on Alibaba. There’s a supplier or two there. Don’t worry about minimum order quantities, just request a sample.
Oh but there is. Two motors and one chain should run better than a single chain. One motor will be stationary with the second able to slide closer to the first motor to loosen the chain and away to tighten. That is the only complex part. The added bonus is the second motor doubles as a chain tensioner.
Also two motors should dissipate heat better than one. There is more surface area and four power wires vs. two going to the motors. It should run cooler than a single 36 or 48V motor pushing 1,200 watts.
1,200W / 50A = 24V - 50A / 2 = 25 amps each motor.
1,200W / 43V = 28A
1,200W / 55V = 22A.
The 55V motor would be the most efficient and best choice but NOT with 50 pounds of batteries to push it.
Therefore two 24V motors is a no brainer with only 20 pounds battery weight.
I already have a 48V 1,000W Unite motor on the front of a 27.5" full suspension with a 1,500W brand new hub kit in the rear.
Look at the total power output
60 amps * 55V = 3,300 watts. I geared the front chain for about 30 mph and hit 33.5 mph on flat with the rear hub. I have not tested the front chain yet but sports its own DC breaker and left throttle. The right is twist grip for the hub.
Basically if it all works it is my Flagship ebike. It is what I would take to a place that has big hills. The big downfall is my 56V LIFEPO4 is getting old and tired but could go a few hundred more cycles.. The more I run them though for short trips the less cycles.
I can run either my 3,300W full suspension or my 1,800W brushless with the 38 amp controller with 56V LIFEPO4 which is about 30 pounds. Still 20 pounds lighter than LTO.
If I run 25V exclusively for the shorter trips then my LIFEPO4 will last a long time and work for longer trips. It st makes sense.
We may not agree on everything but I can see why you said the Currie 900W motor will over heat at > 20 amps. The 36V motor I run daily now with 43V LIFEPO4 is rated at a ridiculous
Thanks.
Skyler out.