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Atv electric conversion
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<blockquote data-quote="TechWise" data-source="post: 7779475" data-attributes="member: 11384"><p>You certainly don't need a clutch with the electric motor as it's happy to pull away from zero RPM. You don't need a gearbox either so long as you set a good gear/chain ratio that matches the speed range of the motor with the speed range you want for the bike. Not unlike how you can mess around with the sprocket ratio on petrol bikes with a centrifugal clutch. If you're working on something with four wheel drive, it gets a bit more interesting. You either keep the transfer box and centre diff in place to deal with 4wd or you remove that too and have a drive motor for each wheel, which is quite complex.</p><p></p><p>In terms of battery <strong>voltage</strong>, something from 48 to 96 V seems to be the standard with most off-the-shelf kits like the one I linked to in post #5, so that's between 4 and 8 12V batteries in series. Power is volts multiplied by amps, and the motor/motor controller combo you buy will generally state its maximum current. The one I linked in post #5 says 220A continuous, 660A peak. Multiply that by 96V and that gives you 21kW continuous, 63kW peak. That's 28hp continuous, 84hp peak, which is much more than you probably need for a quad! In fact, 84hp peak of instant electric torque would probably turn a quad bike into a terrifying instrument of death. A smaller kit would probably do the job.</p><p></p><p>The battery <strong>capacity -</strong> that's a bit more tricky. It's very hard to try and put a figure on how litres of petrol translates to kWh of electrical energy when you consider the huge range of driving conditions. The first Ecocharger quad offered 7.2kWh of battery capacity and their new lithium ion one seems to offer 11kWh of storage. The Polaris Ranger reportedly has around 15kWh. My electric Vauxhall Corsa offers 50kWh which translates to 150 miles of average driving, but then that's a car which is much heavier but maybe driven more economically than an ATV. I think I'd be aiming around that 15kWh mark to be a serious competitor with petrol, which means 8 12V batteries at 150Ah nominal rating. However, the batteries won't achieve their full rating in practice or over their lifetime, but that's a story for another day! You also need "leisure" or "caravan" type batteries which can stand the deep charge/discharge cycles.</p></blockquote><p></p>
[QUOTE="TechWise, post: 7779475, member: 11384"] You certainly don't need a clutch with the electric motor as it's happy to pull away from zero RPM. You don't need a gearbox either so long as you set a good gear/chain ratio that matches the speed range of the motor with the speed range you want for the bike. Not unlike how you can mess around with the sprocket ratio on petrol bikes with a centrifugal clutch. If you're working on something with four wheel drive, it gets a bit more interesting. You either keep the transfer box and centre diff in place to deal with 4wd or you remove that too and have a drive motor for each wheel, which is quite complex. In terms of battery [B]voltage[/B], something from 48 to 96 V seems to be the standard with most off-the-shelf kits like the one I linked to in post #5, so that's between 4 and 8 12V batteries in series. Power is volts multiplied by amps, and the motor/motor controller combo you buy will generally state its maximum current. The one I linked in post #5 says 220A continuous, 660A peak. Multiply that by 96V and that gives you 21kW continuous, 63kW peak. That's 28hp continuous, 84hp peak, which is much more than you probably need for a quad! In fact, 84hp peak of instant electric torque would probably turn a quad bike into a terrifying instrument of death. A smaller kit would probably do the job. The battery [B]capacity -[/B] that's a bit more tricky. It's very hard to try and put a figure on how litres of petrol translates to kWh of electrical energy when you consider the huge range of driving conditions. The first Ecocharger quad offered 7.2kWh of battery capacity and their new lithium ion one seems to offer 11kWh of storage. The Polaris Ranger reportedly has around 15kWh. My electric Vauxhall Corsa offers 50kWh which translates to 150 miles of average driving, but then that's a car which is much heavier but maybe driven more economically than an ATV. I think I'd be aiming around that 15kWh mark to be a serious competitor with petrol, which means 8 12V batteries at 150Ah nominal rating. However, the batteries won't achieve their full rating in practice or over their lifetime, but that's a story for another day! You also need "leisure" or "caravan" type batteries which can stand the deep charge/discharge cycles. [/QUOTE]
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