Bike conversion

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Bike conversion

Postby karlajensen » Thu Mar 06, 2014 11:21 pm

Kit in the air from Hong-Kong
converting my bike to a rocket, rated at some 350W Eu Watts and 25A 48V peak for 1200W......
http://em3ev.com/store/

Not cheap but nothing good ever is.

Went for the big bottle battery, got an extra charger keep the cycles on the battery reasonable by topping up at work.
8E + 8W + 8Nth Garage CMS2000-1 with ~4500W in 3 strings of 8.
Fronius Galvo 3.0 inverter with ~6.6kW panels
12x ZNShine + 12x 180W Solarfuns both NW + ZNShine 12x190 facing SE.
Edwards Solar Hot water


Luck Favours the well prepared.
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Re: Bike conversion

Postby offgridQLD » Tue Mar 11, 2014 8:25 pm

Not sure what bike frame you are putting the kit on but (safety warning) make sure you use some nice torque arms or plates to stop the axle chewing out the dropouts or snapping them off . More so in a aluminium frame. (particularly if its a front wheel motor).

The geared hub I put on my wifes folding bike ripped the entire rear dropout off the bike (using real short torque arms in a aluminium frame) Mind you it was being fed with over 3000w :lol: two 16mm thick SS machined torque plates got it back on the road.

Once you feel that smooth quiet instantaneous torque you will have the EV grin :D I'ts addictive.

Kurt
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.
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Re: Bike conversion

Postby karlajensen » Mon Mar 17, 2014 9:18 pm

BIG kickass torque arm YES!

Update, bike does 40-42km/hr unassisted and with pedaling will zap up to 45km/hr fairly easily.

anything over that and i'm on my own as voltage not high enough (should have picked a higher speed motor)

anyway PERFECT for my bike VERY happy.

can do the trip to work in same time on the bike as in the work van :)
8E + 8W + 8Nth Garage CMS2000-1 with ~4500W in 3 strings of 8.
Fronius Galvo 3.0 inverter with ~6.6kW panels
12x ZNShine + 12x 180W Solarfuns both NW + ZNShine 12x190 facing SE.
Edwards Solar Hot water


Luck Favours the well prepared.
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karlajensen
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Joined: Tue Oct 13, 2009 10:30 am
Location: Perth

Re: Bike conversion

Postby offgridQLD » Mon Mar 17, 2014 10:23 pm

I find picking a motor kV/battery voltage combo that tops out the max motor asist at a speed where you can comfotably peddele along with it in the bikes top gear works well.

Bike components are not designed to for forces Much beyond what a human can creat. I have tamed my ebikes down to 50kmh max speed for the trike and 40kmh for the wife's folding bike. Both speeds don't atract the wrong attention and are within the limits of what both bikes can achieve human powerd.

Now how fast they can acelelerate up the the above speed is another thing.

i think your motor choice is fine . I find Low kV high torqe motors are the most fun . I run a motor that has a very low kV (rpm) volt. I then make it even slower by running it in a 20 inch wheel. Slow = torque but I make up lost speed with voltage, just keep upping the voltage until you reach your target speed.

Kurt
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.
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