Razor E300 MY1020 500w

[Ianhill]

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My razor project built to be light and powerful as possible on the cheap. Everything is used off eBay and 3 scooters have been used to make this one off, It has a MY1020 500w motor and a 9s11p 18650 battery pack Around 20ah and handles the current loads easily, I have fused each battery and the pack as a whole to try and keep things safe, I use a separate 18650 5s battery pack 20.5v - 15v to run two heavy duty 80A 12v relays switching the motor in direct from the handle control, giving this fact this scooter must be pushed first to start off and not to be ridden by children as it will spit them off due to the high torque , the top speed is around 14 mph but the torque will climb any tarmac hill and I get a range of around 18miles + giving it hell.
I have used a razor e100 front rim to get the calliper and rim brake then fitted the e300 tyre to keep the correct look, the motor has been mounted using the mounts from the scooter it was recycled from (Chinese crap) but strong , I then cut the rear frame to suit the new motor and line the drive cogs I then used a chain roller underneath to keep things all smooth and when the chain neatly the rear brake is the original drum brake so it doesn't stop to great with a drum and calliper but it does stop so is functional I will get a weight of the scooter up shortly and look forward to your questions

 

[Ianhill]

To charge the pack I use a icharger 1010b 300w 10s charger I have split the 9s balance leads into a 4s and 5s so I can use 2 low cell voltage alarms to keep a eye on each bank of cells, I have purposely kept the electrics primitive and simple to try and keep as little things as possible to go wrong and keep it robust as can be.

 

[bandaro]

Ahh nice, rebuilding those scooters can be very cheap and reliable.

I did a schwinn scooter a while back and it was great until the motor blew burning across an oval. With a bigger motor there is no issues. In the end I decided to drop it for a board as I already skate and the scooter was a little small for me, is yours a larger frame/you a small person or have you modified it to fit you at all?

Splitting the packs up is a good idea, allows you to use the cheap everything - low voltage testers as you have as well as low voltage chargers (and lower power). you can charge the packs separately to halve the charge time and everything. I run 6s2p and charge as 4 3s packs on a cheap turnigy 4x6 charger, works a treat.

How do you find the chain noise around your (presumably) small pinion gear?

 

[Ianhill]

Its a fairly large frame scooter and I have nodded the handle bars to get the height I needed, Iam 6ft and 70kg so its at it max weight to be fair, I charge the pack in a 9s config there's 99 18650 cells there 9s11p so the chargers full whack is around 0.5c charge rate its the biggest pack I could functionaly charge and balance as 1 unit

 

[Ianhill]

I was looking for a big wheeled scooter like the schwin but just couldn't source one so I mixed 3 into 1 to get what I wanted a light powerful scooter capable of distance, the chain is fairly quiet it was loud and rattled as a stock e300 it has a 6mm chain I think, I had a my1020 motor much beefier and had a 8mm chain and sprocket with low gearing quiet enough to hear to motor hum I have used a chain roller on the underside of the chain and the tension is not that high but enough to keep it all in check.

 

[Ianhill]

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Added the rear cover to the wheel after cutting to fit, I've put cree headlight and a blinker back light(short days in Wales UK) Next is a 61.5v booster circuit to raise my top speed but will only be used at high speed not to stress the motor into popping at low rpm high current moments.