Has anyone here ever been to China or India and seen bikes with 72volt batterys?

AMKC

I am looking for one at the moment. It's for a three wheeled bike. Seemingly there is none of these batterys in the Country well there might be one or two but there very rare.

I am I correct in saying that a 12volt battery in a car just basically sends a jolt of electricity to the starter of a car which starts the engine and then the battery is just charged by the engine for the rest of the time but that it could never power and drive an electric car or bike?

micah537

The higher the V, the faster it goes or the more power it has. Ah or amps per hour is the duration of the battery.

12v power children's electric small motorbikes or cars that they can sit in. It could probably be used in a bike but would be slower than a 24v/36v/72v etc.

A battery will have V rating and Amp rating. Think of the amp as the fuel used to run it and the V as the engine in an over simplified way.

So 1mph running at 12v might use 5 amp per hour and 5 mph running at 12v might use 14 amp per hour. So the higher the amp per hour the battery is rated at the longer it lasts.

Watts = V X a

Is the bike fully electric? I don't know your setup but adding two 36v batteries gives you 72v.

AMKC

https://www.boards.ie/discussion/comment/118931068#Comment_118931068

Its fully electric yes and

Watts is V x A.

I know.

Montage of Feck

Six 12v batteries in series will give you 72v.

AMKC

https://www.boards.ie/discussion/comment/118941056#Comment_118941056

YescI know that but it's just not practical. It would mean having to charge all six batteries each time they needed to be charged and not the way the correct battery could be charged in it either. Also there is no guarantee they would work with the inverter in it and the motor.i think the best thing is just to get the correct manufactures battery.

zg3409

Electric golf carts are used all over the place. I think they are 48 volts, 4 12 volts in series, but may be higher. Many of the pedal tuc tuc type passenger things in Dublin were in fact electric vehicles probably 72 volt or similar. They had no tax etc and were leased out. Probably illegal. They tend to hide the electrics to reduce hassle from gardai and customers are more likely to tip if the person is using pedal power. You can get 72 volt chargers and charge 2 X 12 volt in series if they are all the same make, size and same history from new. Ideally if going lead acid you want deep discharge batteries, lithium are much lighter but more expensive and harder to charge. Most E bike shops in Dublin should be able to help you out, or you can buy complete kits on eBay etc.

If you want real range you want lithium. Check the law as far as I understand most are illegal and legal is limited in power, top speed and must be pedal assisted, E scooters are still technically illegal until they legalise some models.

Beware too you want very good brakes and the risk of a crash with a pedestrian is high with a large 3 wheel silent vehicle flying around towns.