Comments on: I’m building a 48V electric bike with four 12V batteries. Do I need to buy a DC/DC converter? http://www.electricvehicleinfo.com/building-electric-vehicles/im-building-a-48v-electric-bike-with-four-12v-batteries-do-i-need-to-buy-a-dcdc-converter.html Electric Vehicle Information Resource Sun, 20 Feb 2011 01:03:40 +0000 hourly 1 https://wordpress.org/?v=3.8.41 By: goober http://www.electricvehicleinfo.com/building-electric-vehicles/im-building-a-48v-electric-bike-with-four-12v-batteries-do-i-need-to-buy-a-dcdc-converter.html#comment-30 Fri, 18 Feb 2011 20:39:36 +0000 http://www.electricvehicleinfo.com/building-electric-vehicles/im-building-a-48v-electric-bike-with-four-12v-batteries-do-i-need-to-buy-a-dcdc-converter.html#comment-30 How will you control the speed of the bike? The DC/DC converter can be designed to adjust the voltage to the motor to control its speed but it would not waste much battery power.

]]> By: billrussell42 http://www.electricvehicleinfo.com/building-electric-vehicles/im-building-a-48v-electric-bike-with-four-12v-batteries-do-i-need-to-buy-a-dcdc-converter.html#comment-29 Wed, 16 Feb 2011 15:37:24 +0000 http://www.electricvehicleinfo.com/building-electric-vehicles/im-building-a-48v-electric-bike-with-four-12v-batteries-do-i-need-to-buy-a-dcdc-converter.html#comment-29 no, you put the 4 batteries in series to get 48 volts, and connect that to the 48 volt motor. But you need a speed controller of some sort between the battery and the motor, else it will run at full speed all the time.

If you have a 24 volt motor, wire the batteries in series parallel to get 24 volts. Or just use 2 batteries.

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]]> By: john http://www.electricvehicleinfo.com/building-electric-vehicles/im-building-a-48v-electric-bike-with-four-12v-batteries-do-i-need-to-buy-a-dcdc-converter.html#comment-28 Sun, 13 Feb 2011 12:05:06 +0000 http://www.electricvehicleinfo.com/building-electric-vehicles/im-building-a-48v-electric-bike-with-four-12v-batteries-do-i-need-to-buy-a-dcdc-converter.html#comment-28 4x 12V batteries in SERIES will give you 48V

DC/DC converters are analogous to Power Transformers in AC circuits.

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